{"id":1501,"date":"2024-11-13T16:21:21","date_gmt":"2024-11-13T08:21:21","guid":{"rendered":"https:\/\/note.ui11.cc\/?p=1501"},"modified":"2024-11-13T16:21:22","modified_gmt":"2024-11-13T08:21:22","slug":"sql%e4%bc%98%e5%8c%96%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"https:\/\/note.ui11.cc\/index.php\/2024\/11\/13\/sql%e4%bc%98%e5%8c%96%e6%8a%80%e5%b7%a7\/","title":{"rendered":"Sql\u4f18\u5316\u6280\u5de7"},"content":{"rendered":"\n

SQL\u4f18\u5316\u768435\u4e2a\u5c0f\u6280\u5de7<\/p>\n\n\n\n

\u524d\u8a00<\/h2>\n\n\n\n

1. \u907f\u514d\u4f7f\u7528 SELECT *<\/code>\uff0c\u4f7f\u7528\u5177\u4f53\u5b57\u6bb5<\/h3>\n\n\n\n

\u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n

SELECT * FROM employee;<\/code><\/pre>\n\n\n\n
\u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
SELECT id, name, age FROM employee;<\/code><\/pre>\n\n\n\n
\u4f7f\u7528\u5177\u4f53\u5b57\u6bb5\u53ef\u4ee5\u8282\u7701\u8d44\u6e90\u3001\u51cf\u5c11\u7f51\u7edc\u5f00\u9500\uff0c\u4e14\u80fd\u907f\u514d\u56de\u8868\u67e5\u8be2\u3002<\/p>\n\n\n\n
2. \u907f\u514d\u5728 WHERE<\/code> \u5b50\u53e5\u4e2d\u4f7f\u7528 OR<\/code><\/h3>\n\n\n\n
\u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
SELECT * FROM user WHERE userid=1 OR age=18;<\/code><\/pre>\n\n\n\n
\u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
-- \u4f7f\u7528 UNION ALL
SELECT * FROM user WHERE userid=1
UNION ALL
SELECT * FROM user WHERE age=18;<\/code><\/pre>\n\n\n\n
\u539f\u56e0<\/strong>\uff1aOR<\/code> \u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u5e76\u5f15\u53d1\u5168\u8868\u626b\u63cf\u3002<\/p>\n\n\n\n
3. \u4f7f\u7528 LIMIT<\/code> \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u8fd4\u56de<\/h3>\n\n\n\n
\u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
SELECT id, order_date FROM order_tab WHERE user_id=666 ORDER BY create_date DESC;<\/code><\/pre>\n\n\n\n
\u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
SELECT id, order_date FROM order_tab WHERE user_id=666 ORDER BY create_date DESC LIMIT 1;<\/code><\/pre>\n\n\n\n
LIMIT<\/code> \u63d0\u5347\u67e5\u8be2\u6548\u7387\uff0c\u907f\u514d\u591a\u4f59\u7684\u6570\u636e\u8fd4\u56de\u3002<\/p>\n\n\n\n
4. \u4f7f\u7528\u6570\u503c\u7c7b\u578b\u4ee3\u66ff\u5b57\u7b26\u4e32<\/h3>\n\n\n\n
\u4f8b\u5b50<\/strong>\uff1a\u6027\u522b\u5b57\u6bb5\u5efa\u8bae\u7528\u6570\u503c\uff08\u59820\u4ee3\u8868\u5973\u751f\uff0c1\u4ee3\u8868\u7537\u751f\uff09\u800c\u975e\u5b57\u7b26\u4e32\uff08\u5982”WOMEN”\u3001”MAN”\uff09\u3002
\u539f\u56e0<\/strong>\uff1a\u6570\u503c\u7c7b\u578b\u5360\u7528\u5b58\u50a8\u7a7a\u95f4\u5c0f\u3001\u6bd4\u8f83\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n\n\n\n
5. \u6279\u91cf\u64cd\u4f5c\uff08\u63d2\u5165\u3001\u5220\u9664\u3001\u67e5\u8be2\uff09<\/h3>\n\n\n\n
\u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
for(User u : list) {
    INSERT INTO user(name, age) VALUES(#name#, #age#);
}<\/code><\/pre>\n\n\n\n
\u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
INSERT INTO user(name, age) VALUES
<foreach collection=\"list\" item=\"item\" index=\"index\" separator=\",\">
    (#{item.name}, #{item.age})
<\/foreach><\/code><\/pre>\n\n\n\n
\u539f\u56e0<\/strong>\uff1a\u6279\u91cf\u63d2\u5165\u6027\u80fd\u66f4\u4f18\u3002<\/p>\n\n\n\n
6. \u4f7f\u7528 UNION ALL<\/code> \u66ff\u6362 UNION<\/code>\uff08\u65e0\u91cd\u590d\u8bb0\u5f55\u65f6\uff09<\/h3>\n\n\n\n
\u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
SELECT * FROM user WHERE userid=1
UNION
SELECT * FROM user WHERE age=10;<\/code><\/pre>\n\n\n\n
\u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
SELECT * FROM user WHERE userid=1
UNION ALL
SELECT * FROM user WHERE age=10;<\/code><\/pre>\n\n\n\n
\u539f\u56e0<\/strong>\uff1aUNION<\/code> \u4f1a\u6392\u5e8f\u548c\u5408\u5e76\uff0cUNION ALL<\/code> \u5219\u7701\u53bb\u8fd9\u4e00\u6b65\u3002<\/p>\n\n\n\n
7. \u5c3d\u53ef\u80fd\u4f7f\u7528 NOT NULL<\/code> \u5b9a\u4e49\u5b57\u6bb5<\/h3>\n\n\n\n
\u539f\u56e0<\/strong>\uff1aNOT NULL<\/code><\/p>\n\n\n\n
    \n
  • \u53ef\u4ee5\u9632\u6b62\u51fa\u73b0\u7a7a\u6307\u9488\u95ee\u9898\u3002<\/li>\n\n\n\n
  • NULL\u503c\u5b58\u50a8\u4e5f\u9700\u8981\u989d\u5916\u7684\u7a7a\u95f4\u7684\uff0c\u5b83\u4e5f\u4f1a\u5bfc\u81f4\u6bd4\u8f83\u8fd0\u7b97\u66f4\u4e3a\u590d\u6742\uff0c\u4f7f\u4f18\u5316\u5668\u96be\u4ee5\u4f18\u5316SQL\u3002<\/li>\n\n\n\n
  • NULL\u503c\u6709\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548<\/li>\n<\/ul>\n\n\n\n
    8. \u907f\u514d\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528\u5185\u7f6e\u51fd\u6570<\/h3>\n\n\n\n
    \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT userId, loginTime FROM loginuser WHERE DATE_ADD(loginTime, INTERVAL 7 DAY) >= NOW();<\/code><\/pre>\n\n\n\n
    \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT userId, loginTime FROM loginuser WHERE loginTime >= DATE_ADD(NOW(), INTERVAL -7 DAY);<\/code><\/pre>\n\n\n\n
    \u539f\u56e0<\/strong>\uff1a\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528\u51fd\u6570\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/p>\n\n\n\n
    9. \u907f\u514d\u5728 WHERE<\/code> \u5b50\u53e5\u4e2d\u5bf9\u5b57\u6bb5\u8fdb\u884c\u8868\u8fbe\u5f0f\u64cd\u4f5c<\/h3>\n\n\n\n
    \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT * FROM user WHERE age - 1 = 10;<\/code><\/pre>\n\n\n\n
    \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT * FROM user WHERE age = 11;<\/code><\/pre>\n\n\n\n
    10. \u5728 GROUP BY<\/code> \u524d\u8fdb\u884c\u6761\u4ef6\u8fc7\u6ee4<\/h3>\n\n\n\n
    \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT user_id, SUM(amount) AS total_amount
    FROM orders
    GROUP BY user_id
    HAVING city = '\u5317\u4eac';<\/code><\/pre>\n\n\n\n
    \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT user_id, SUM(amount) AS total_amount
    FROM orders
    WHERE city = '\u5317\u4eac'
    GROUP BY user_id;<\/code><\/pre>\n\n\n\n
    11. \u4f18\u5316 LIKE<\/code> \u8bed\u53e5<\/h3>\n\n\n\n
    \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT userId, name FROM user WHERE userId LIKE '%123';<\/code><\/pre>\n\n\n\n
    \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT userId, name FROM user WHERE userId LIKE '123%';<\/code><\/pre>\n\n\n\n
    \u539f\u56e0<\/strong>\uff1a%<\/code> \u653e\u5728\u524d\u9762\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/p>\n\n\n\n
    12. \u4f7f\u7528\u5c0f\u8868\u9a71\u52a8\u5927\u8868<\/h3>\n\n\n\n
    \u5c0f\u8868\u5148\u6267\u884c\u4ee5\u51cf\u5c11\u626b\u63cf\u91cf\uff0c\u5982\u4f7f\u7528 EXISTS<\/code> \u6216 IN<\/code> \u8fdb\u884c\u8fc7\u6ee4\u3002<\/p>\n\n\n\n
    \u5047\u8bbe\u6211\u4eec\u6709\u4e2a\u5ba2\u6237\u8868\u548c\u4e00\u4e2a\u8ba2\u5355\u8868\u3002\u5176\u4e2d\u8ba2\u5355\u8868\u670910\u4e07\u8bb0\u5f55\uff0c\u5ba2\u6237\u8868\u53ea\u67091000\u884c\u8bb0\u5f55\u3002\u73b0\u5728\u8981\u67e5\u8be2\u4e0b\u5355\u8fc7\u7684\u5ba2\u6237\u4fe1\u606f\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n\n\n\n
    SELECT * FROM customers c
    WHERE EXISTS (
        SELECT 1 FROM orders o WHERE o.customer_id = c.id
    );<\/code><\/pre>\n\n\n\n
    EXISTS \u4f1a\u9010\u884c\u626b\u63cf customers \u8868\uff08\u5373\u5c0f\u8868\uff09\uff0c\u5bf9\u6bcf\u4e00\u884c c.id\uff0c\u5728 orders \u8868\uff08\u5927\u8868\uff09\u4e2d\u68c0\u67e5\u662f\u5426\u6709 customer_id = c.id \u7684\u8bb0\u5f55\u3002\u5f53\u7136\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528in\u5b9e\u73b0\uff1a<\/p>\n\n\n\n
    SELECT * FROM customers
    WHERE id IN (
        SELECT customer_id FROM orders
    );<\/code><\/pre>\n\n\n\n
    in \u67e5\u8be2\u4f1a\u5148\u6267\u884c\u5185\u90e8\u67e5\u8be2\u90e8\u5206 SELECT customer_id FROM orders\uff0c\u83b7\u5f97 orders \u8868\uff08\u5927\u8868\uff09\u4e2d\u7684\u6240\u6709 customer_id\uff0c\u7136\u540e\u5728 customers \u8868\uff08\u5c0f\u8868\uff09\u4e2d\u67e5\u627e\u5339\u914d\u7684 id\u3002\u56e0\u4e3aorders\u8868\u7684\u6570\u636e\u91cf\u6bd4\u8f83\u5927\uff0c\u56e0\u6b64\u8fd9\u91cc\u7528exists\u6548\u679c\u4f1a\u76f8\u5bf9\u66f4\u597d\u4e00\u70b9\u3002<\/p>\n\n\n\n
    13. IN<\/code> \u67e5\u8be2\u7684\u5143\u7d20\u4e0d\u5b9c\u592a\u591a<\/h3>\n\n\n\n
    \u5982\u679c\u4f7f\u7528\u4e86in\uff0c\u5373\u4f7f\u540e\u9762\u7684\u6761\u4ef6\u52a0\u4e86\u7d22\u5f15\uff0c\u8fd8\u662f\u8981\u6ce8\u610fin\u540e\u9762\u7684\u5143\u7d20\u4e0d\u8981\u8fc7\u591a\u54c8\u3002
         in\u5143\u7d20\u4e00\u822c\u5efa\u8bae\u4e0d\u8981\u8d85\u8fc7200\u4e2a\uff0c\u5982\u679c\u8d85\u8fc7\u4e86\uff0c\u5efa\u8bae\u5206\u7ec4\uff0c\u6bcf\u6b21200\u4e00\u7ec4\u8fdb\u884c\u54c8\u3002
         \u53cd\u4f8b\uff1a<\/p>\n\n\n\n
    select user_id,name from user where user_id in (1,2,3...1000000); <\/code><\/pre>\n\n\n\n
    \u5982\u679c\u6211\u4eec\u5bf9in\u7684\u6761\u4ef6\u4e0d\u505a\u4efb\u4f55\u9650\u5236\u7684\u8bdd\uff0c\u8be5\u67e5\u8be2\u8bed\u53e5\u4e00\u6b21\u6027\u53ef\u80fd\u4f1a\u67e5\u8be2\u51fa\u975e\u5e38\u591a\u7684\u6570\u636e\uff0c\u5f88\u5bb9\u6613\u5bfc\u81f4\u63a5\u53e3\u8d85\u65f6\u3002\u5c24\u5176\u6709\u65f6\u5019\uff0c\u6211\u4eec\u662f\u7528\u7684\u5b50\u67e5\u8be2\uff0cin\u540e\u9762\u7684\u5b50\u67e5\u8be2\uff0c\u4f60\u90fd\u4e0d\u77e5\u9053\u6570\u91cf\u6709\u591a\u5c11\u90a3\u79cd\uff0c\u66f4\u5bb9\u6613\u91c7\u5751.
         \u5982\u4e0b\u8fd9\u79cd\u5b50\u67e5\u8be2\uff1a<\/p>\n\n\n\n
    select * from user where user_id in (select author_id from artilce where type = 1);<\/code><\/pre>\n\n\n\n
    \u6b63\u4f8b\u662f\uff0c\u5206\u6279\u8fdb\u884c\uff0c\u6bd4\u5982\u6bcf\u6279200\u4e2a\uff1a<\/p>\n\n\n\n
    select user_id,name from user where user_id in (1,2,3...200);<\/code><\/pre>\n\n\n\n
    14. \u4f18\u5316 LIMIT<\/code> \u5206\u9875<\/h3>\n\n\n\n
    \u907f\u514d\u6df1\u5206\u9875\uff0c\u4f7f\u7528\u201c\u6807\u7b7e\u8bb0\u5f55\u6cd5\u201d\u6216\u201c\u5ef6\u8fdf\u5173\u8054\u6cd5\u201d\u63d0\u5347\u6027\u80fd\u3002
         \u6211\u4eec\u65e5\u5e38\u505a\u5206\u9875\u9700\u6c42\u65f6\uff0c\u4e00\u822c\u4f1a\u7528 limit \u5b9e\u73b0\uff0c\u4f46\u662f\u5f53\u504f\u79fb\u91cf\u7279\u522b\u5927\u7684\u65f6\u5019\uff0c\u67e5\u8be2\u6548\u7387\u5c31\u53d8\u5f97\u4f4e\u4e0b\uff0c\u4e5f\u5c31\u662f\u51fa\u73b0\u6df1\u5206\u9875\u95ee\u9898\u3002
         \u53cd\u4f8b\uff1a<\/p>\n\n\n\n
    select id,name,balance from account where create_time> '2020-09-19' limit 100000,10;<\/code><\/pre>\n\n\n\n
    \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u51cf\u5c11\u56de\u8868\u6b21\u6570\u6765\u4f18\u5316\u3002\u4e00\u822c\u6709\u6807\u7b7e\u8bb0\u5f55\u6cd5\u548c\u5ef6\u8fdf\u5173\u8054\u6cd5\u3002
         \u6807\u7b7e\u8bb0\u5f55\u6cd5\u5c31\u662f\u6807\u8bb0\u4e00\u4e0b\u4e0a\u6b21\u67e5\u8be2\u5230\u54ea\u4e00\u6761\u4e86\uff0c\u4e0b\u6b21\u518d\u6765\u67e5\u7684\u65f6\u5019\uff0c\u4ece\u8be5\u6761\u5f00\u59cb\u5f80\u4e0b\u626b\u63cf\u3002\u5c31\u597d\u50cf\u770b\u4e66\u4e00\u6837\uff0c\u4e0a\u6b21\u770b\u5230\u54ea\u91cc\u4e86\uff0c\u4f60\u5c31\u6298\u53e0\u4e00\u4e0b\u6216\u8005\u5939\u4e2a\u4e66\u7b7e\uff0c\u4e0b\u6b21\u6765\u770b\u7684\u65f6\u5019\uff0c\u76f4\u63a5\u5c31\u7ffb\u5230\u5566\u3002
         \u5047\u8bbe\u4e0a\u4e00\u6b21\u8bb0\u5f55\u5230100000\uff0c\u5219SQL\u53ef\u4ee5\u4fee\u6539\u4e3a\uff1a<\/p>\n\n\n\n
    select  id,name,balance FROM account where id > 100000 limit 10;<\/code><\/pre>\n\n\n\n
    \u8fd9\u6837\u7684\u8bdd\uff0c\u540e\u9762\u65e0\u8bba\u7ffb\u591a\u5c11\u9875\uff0c\u6027\u80fd\u90fd\u4f1a\u4e0d\u9519\u7684\uff0c\u56e0\u4e3a\u547d\u4e2d\u4e86id\u7d22\u5f15\u3002\u4f46\u662f\u8fd9\u79cd\u65b9\u5f0f\u6709\u5c40\u9650\u6027\uff1a\u9700\u8981\u4e00\u79cd\u7c7b\u4f3c\u8fde\u7eed\u81ea\u589e\u7684\u5b57\u6bb5\u3002\u5ef6\u8fdf\u5173\u8054\u6cd5\u5ef6\u8fdf\u5173\u8054\u6cd5\uff0c\u5c31\u662f\u628a\u6761\u4ef6\u8f6c\u79fb\u5230\u4e3b\u952e\u7d22\u5f15\u6811\uff0c\u7136\u540e\u51cf\u5c11\u56de\u8868\u3002
         \u5982\u4e0b\uff1a<\/p>\n\n\n\n
    select  acct1.id,acct1.name,acct1.balance FROM account acct1 INNER JOIN (SELECT a.id FROM account a WHERE a.create_time > '2020-09-19' limit 100000, 10) AS acct2 on acct1.id= acct2.id;<\/code><\/pre>\n\n\n\n
    \u4f18\u5316\u601d\u8def\u5c31\u662f\uff0c\u5148\u901a\u8fc7idx_create_time\u4e8c\u7ea7\u7d22\u5f15\u6811\u67e5\u8be2\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u4e3b\u952eID\uff0c\u518d\u4e0e\u539f\u8868\u901a\u8fc7\u4e3b\u952eID\u5185\u8fde\u63a5\uff0c\u8fd9\u6837\u540e\u9762\u76f4\u63a5\u8d70\u4e86\u4e3b\u952e\u7d22\u5f15\u4e86\uff0c\u540c\u65f6\u4e5f\u51cf\u5c11\u4e86\u56de\u8868\u3002<\/p>\n\n\n\n
    15. \u4f18\u5148\u4f7f\u7528\u8fde\u63a5\u67e5\u8be2\u800c\u975e\u5b50\u67e5\u8be2<\/h3>\n\n\n\n
    \u56e0\u4e3a\u4f7f\u7528\u5b50\u67e5\u8be2\uff0c\u53ef\u80fd\u4f1a\u521b\u5efa\u4e34\u65f6\u8868\u3002
    \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT * FROM customers WHERE id IN (SELECT customer_id FROM orders);<\/code><\/pre>\n\n\n\n
    IN \u5b50\u67e5\u8be2\u4f1a\u5728 orders \u8868\u4e2d\u67e5\u8be2\u6240\u6709 customer_id\uff0c\u5e76\u751f\u6210\u4e00\u4e2a\u4e34\u65f6\u7ed3\u679c\u96c6\u3002<\/p>\n\n\n\n
    \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
    SELECT DISTINCT c.* FROM customers c JOIN orders o ON c.id = o.customer_id;<\/code><\/pre>\n\n\n\n
    \u901a\u8fc7 JOIN \u76f4\u63a5\u5c06 customers \u548c orders \u8868\u5173\u8054\uff0c\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u4e00\u6b21\u6027\u7b5b\u9009\u5b8c\u6210\u3002
         MySQL \u4f18\u5316\u5668\u901a\u5e38\u53ef\u4ee5\u5229\u7528\u7d22\u5f15\u6765\u52a0\u901f JOIN\uff0c\u907f\u514d\u4e86\u4e34\u65f6\u8868\u7684\u521b\u5efa\uff0c\u67e5\u8be2\u6548\u679c\u5c31\u66f4\u4f73<\/p>\n\n\n\n
    16. Inner join \u3001left join\u3001right join\uff0c\u4f18\u5148\u4f7f\u7528Inner join\uff0c\u5982\u679c\u662fleft join\uff0c\u5de6\u8fb9\u8868\u7ed3\u679c\u5c3d\u91cf\u5c0f<\/h3>\n\n\n\n
    \u5982\u9700 LEFT JOIN<\/code>\uff0c\u5de6\u8868\u6570\u636e\u7ed3\u679c\u5c3d\u91cf\u5c0f\u3002<\/p>\n\n\n\n
      \n
    • Inner join \u5185\u8fde\u63a5\uff0c\u5728\u4e24\u5f20\u8868\u8fdb\u884c\u8fde\u63a5\u67e5\u8be2\u65f6\uff0c\u53ea\u4fdd\u7559\u4e24\u5f20\u8868\u4e2d\u5b8c\u5168\u5339\u914d\u7684\u7ed3\u679c\u96c6<\/li>\n\n\n\n
    • left join \u5728\u4e24\u5f20\u8868\u8fdb\u884c\u8fde\u63a5\u67e5\u8be2\u65f6\uff0c\u4f1a\u8fd4\u56de\u5de6\u8868\u6240\u6709\u7684\u884c\uff0c\u5373\u4f7f\u5728\u53f3\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002<\/li>\n\n\n\n
    • right join \u5728\u4e24\u5f20\u8868\u8fdb\u884c\u8fde\u63a5\u67e5\u8be2\u65f6\uff0c\u4f1a\u8fd4\u56de\u53f3\u8868\u6240\u6709\u7684\u884c\uff0c\u5373\u4f7f\u5728\u5de6\u8868\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n\n\n\n
      \u90fd\u6ee1\u8db3SQL\u9700\u6c42\u7684\u524d\u63d0\u4e0b\uff0c\u63a8\u8350\u4f18\u5148\u4f7f\u7528Inner join\uff08\u5185\u8fde\u63a5\uff09\uff0c\u5982\u679c\u8981\u4f7f\u7528left join\uff0c\u5de6\u8fb9\u8868\u6570\u636e\u7ed3\u679c\u5c3d\u91cf\u5c0f\uff0c\u5982\u679c\u6709\u6761\u4ef6\u7684\u5c3d\u91cf\u653e\u5230\u5de6\u8fb9\u5904\u7406\u3002
           \u53cd\u4f8b:<\/p>\n\n\n\n
      select * from tab1 t1 left join tab2 t2  on t1.size = t2.size where t1.id>2;<\/code><\/pre>\n\n\n\n
      \u6b63\u4f8b\uff1a<\/p>\n\n\n\n
      select * from (select * from tab1 where id >2) t1 left join tab2 t2 on t1.size = t2.size;<\/code><\/pre>\n\n\n\n
      \u7406\u7531\uff1a\u5982\u679cinner join\u662f\u7b49\u503c\u8fde\u63a5\uff0c\u6216\u8bb8\u8fd4\u56de\u7684\u884c\u6570\u6bd4\u8f83\u5c11\uff0c\u6240\u4ee5\u6027\u80fd\u76f8\u5bf9\u4f1a\u597d\u4e00\u70b9\u3002\u540c\u7406\uff0c\u4f7f\u7528\u4e86\u5de6\u8fde\u63a5\uff0c\u5de6\u8fb9\u8868\u6570\u636e\u7ed3\u679c\u5c3d\u91cf\u5c0f\uff0c\u6761\u4ef6\u5c3d\u91cf\u653e\u5230\u5de6\u8fb9\u5904\u7406\uff0c\u610f\u5473\u7740\u8fd4\u56de\u7684\u884c\u6570\u53ef\u80fd\u6bd4\u8f83\u5c11\u3002<\/p>\n\n\n\n
      17. \u907f\u514d !=<\/code> \u6216 <><\/code> \u64cd\u4f5c\u7b26<\/h3>\n\n\n\n
      \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
      SELECT age, name FROM user WHERE age <> 18;<\/code><\/pre>\n\n\n\n
      \u6b63\u4f8b<\/strong>\uff1a\u53ef\u5206\u4e3a\u4e24\u4e2a\u67e5\u8be2\u3002<\/p>\n\n\n\n
      select age,name  from user where age <18;
      select age,name  from user where age >18;<\/code><\/pre>\n\n\n\n
      \u4f7f\u7528!=\u548c<>\u5f88\u53ef\u80fd\u4f1a\u8ba9\u7d22\u5f15\u5931\u6548<\/p>\n\n\n\n
      18. \u4f7f\u7528\u8054\u5408\u7d22\u5f15\u65f6\u9075\u5faa\u6700\u5de6\u5339\u914d\u539f\u5219<\/h3>\n\n\n\n
      \u4f8b\u5982\u8054\u5408\u7d22\u5f15 (userId, age)<\/code>\uff0c\u67e5\u8be2 userId<\/code> \u548c age<\/code> \u65f6\u4f18\u5148\u4f7f\u7528 userId<\/code>\u3002<\/p>\n\n\n\n
      \u8868\u7ed3\u6784\uff1a\uff08\u6709\u4e00\u4e2a\u8054\u5408\u7d22\u5f15idx_userid_age\uff0cuserId\u5728\u524d\uff0cage\u5728\u540e\uff09<\/p>\n\n\n\n
      CREATE TABLE `user` (
        `id` int(11) NOT NULL AUTO_INCREMENT,
        `userId` int(11) NOT NULL,
        `age` int(11) DEFAULT NULL,
        `name` varchar(255) NOT NULL,
        PRIMARY KEY (`id`),
        KEY `idx_userid_age` (`userId`,`age`) USING BTREE
      ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;<\/code><\/pre>\n\n\n\n
      \u53cd\u4f8b\uff1a<\/p>\n\n\n\n
      select * from user where age = 10;<\/code><\/pre>\n\n\n\n
      \u6b63\u4f8b\uff1a\/\/\u7b26\u5408\u6700\u5de6\u5339\u914d\u539f\u5219<\/p>\n\n\n\n
      select * from user where userid=10 and age =10;<\/code><\/pre>\n\n\n\n
      \/\/\u7b26\u5408\u6700\u5de6\u5339\u914d\u539f\u5219<\/p>\n\n\n\n
      select * from user where userid =10;<\/code><\/pre>\n\n\n\n
      \u7406\u7531\uff1a\u5f53\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u8054\u5408\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u5982(k1,k2,k3)\uff0c\u76f8\u5f53\u4e8e\u521b\u5efa\u4e86\uff08k1\uff09\u3001(k1,k2)\u548c(k1,k2,k3)\u4e09\u4e2a\u7d22\u5f15\uff0c\u8fd9\u5c31\u662f\u6700\u5de6\u5339\u914d\u539f\u5219\u3002\u8054\u5408\u7d22\u5f15\u4e0d\u6ee1\u8db3\u6700\u5de6\u539f\u5219\uff0c\u7d22\u5f15\u4e00\u822c\u4f1a\u5931\u6548\uff0c\u4f46\u662f\u8fd9\u4e2a\u8fd8\u8ddfMysql\u4f18\u5316\u5668\u6709\u5173\u7684\u3002<\/p>\n\n\n\n
      19. \u5bf9 WHERE<\/code> \u548c ORDER BY<\/code> \u6d89\u53ca\u7684\u5217\u5efa\u7d22\u5f15<\/h3>\n\n\n\n
      \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
      SELECT * FROM user WHERE address = '\u6df1\u5733' ORDER BY age;<\/code><\/pre>\n\n\n\n
      \u6b63\u4f8b\uff1a<\/strong>
           \u8986\u76d6\u7d22\u5f15\u80fd\u591f\u4f7f\u5f97\u4f60\u7684SQL\u8bed\u53e5\u4e0d\u9700\u8981\u56de\u8868\uff0c\u4ec5\u4ec5\u8bbf\u95ee\u7d22\u5f15\u5c31\u80fd\u591f\u5f97\u5230\u6240\u6709\u9700\u8981\u7684\u6570\u636e\uff0c\u5927\u5927\u63d0\u9ad8\u4e86\u67e5\u8be2\u6548\u7387\u3002<\/p>\n\n\n\n
      ALTER TABLE user ADD INDEX idx_address_age (address, age);<\/code><\/pre>\n\n\n\n
      20. \u4f7f\u7528\u8986\u76d6\u7d22\u5f15<\/h3>\n\n\n\n
      \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
      SELECT id, name FROM user WHERE userid LIKE '123%';<\/code><\/pre>\n\n\n\n
      21. \u5220\u9664\u5197\u4f59\u7d22\u5f15<\/h3>\n\n\n\n
      \u907f\u514d\u91cd\u590d\u7d22\u5f15\uff0c\u8282\u7701\u8d44\u6e90\u3002
           \u53cd\u4f8b\uff1a <\/p>\n\n\n\n
      KEY `idx_userId` (`userId`)  
      KEY `idx_userId_age` (`userId`,`age`)<\/code><\/pre>\n\n\n\n
      \u6b63\u4f8b:  <\/p>\n\n\n\n
      \/\/\u5220\u9664userId\u7d22\u5f15\uff0c\u56e0\u4e3a\u7ec4\u5408\u7d22\u5f15\uff08A\uff0cB\uff09\u76f8\u5f53\u4e8e\u521b\u5efa\u4e86\uff08A\uff09\u548c\uff08A\uff0cB\uff09\u7d22\u5f15
        KEY `idx_userId_age` (`userId`,`age`)<\/code><\/pre>\n\n\n\n
      \u7406\u7531\uff1a\u91cd\u590d\u7684\u7d22\u5f15\u9700\u8981\u7ef4\u62a4\uff0c\u5e76\u4e14\u4f18\u5316\u5668\u5728\u4f18\u5316\u67e5\u8be2\u7684\u65f6\u5019\u4e5f\u9700\u8981\u9010\u4e2a\u5730\u8fdb\u884c\u8003\u8651\uff0c\u8fd9\u4f1a\u5f71\u54cd\u6027\u80fd\u7684\u3002<\/p>\n\n\n\n
      22. \u907f\u514d\u8d85\u8fc73\u4e2a\u4ee5\u4e0a\u7684\u8868\u8fde\u63a5<\/h3>\n\n\n\n
        \n
      • \u4e0d\u8981\u6709\u8d85\u8fc73\u4e2a\u4ee5\u4e0a\u7684\u8868\u8fde\u63a5\u8fde\u8868\u8d8a\u591a\uff0c\u7f16\u8bd1\u7684\u65f6\u95f4\u548c\u5f00\u9500\u4e5f\u5c31\u8d8a\u5927\u3002<\/li>\n\n\n\n
      • \u628a\u8fde\u63a5\u8868\u62c6\u5f00\u6210\u8f83\u5c0f\u7684\u51e0\u4e2a\u6267\u884c\uff0c\u53ef\u8bfb\u6027\u66f4\u9ad8\u3002<\/li>\n\n\n\n
      • \u5982\u679c\u4e00\u5b9a\u9700\u8981\u8fde\u63a5\u5f88\u591a\u8868\u624d\u80fd\u5f97\u5230\u6570\u636e\uff0c\u90a3\u4e48\u610f\u5473\u7740\u7cdf\u7cd5\u7684\u8bbe\u8ba1\u4e86\u3002<\/li>\n<\/ul>\n\n\n\n
        23. \u7d22\u5f15\u6570\u4e0d\u5b9c\u8d85\u8fc75\u4e2a<\/h3>\n\n\n\n
          \n
        • \u7d22\u5f15\u4e0d\u5b9c\u592a\u591a\uff0c\u4e00\u822c5\u4e2a\u4ee5\u5185\u3002\u7d22\u5f15\u5e76\u4e0d\u662f\u8d8a\u591a\u8d8a\u597d\uff0c\u7d22\u5f15\u867d\u7136\u63d0\u9ad8\u4e86\u67e5\u8be2\u7684\u6548\u7387\uff0c\u4f46\u662f\u4e5f\u964d\u4f4e\u4e86\u63d2\u5165\u548c\u66f4\u65b0\u7684\u6548\u7387\u3002<\/li>\n\n\n\n
        • insert\u6216update\u65f6\u6709\u53ef\u80fd\u4f1a\u91cd\u5efa\u7d22\u5f15\uff0c\u6240\u4ee5\u5efa\u7d22\u5f15\u9700\u8981\u614e\u91cd\u8003\u8651\uff0c\u89c6\u5177\u4f53\u60c5\u51b5\u6765\u5b9a\u3002<\/li>\n\n\n\n
        • \u4e00\u4e2a\u8868\u7684\u7d22\u5f15\u6570\u6700\u597d\u4e0d\u8981\u8d85\u8fc75\u4e2a\uff0c\u82e5\u592a\u591a\u9700\u8981\u8003\u8651\u4e00\u4e9b\u7d22\u5f15\u662f\u5426\u6ca1\u6709\u5b58\u5728\u7684\u5fc5\u8981\u3002<\/li>\n<\/ul>\n\n\n\n
          24. \u7d22\u5f15\u4e0d\u9002\u5408\u5efa\u7acb\u5728\u5927\u91cf\u91cd\u590d\u6570\u636e\u7684\u5b57\u6bb5\u4e0a<\/h3>\n\n\n\n
          \u5982\u6027\u522b\u5b57\u6bb5\uff0c\u91cd\u590d\u6570\u636e\u591a\u65f6\u4f18\u5316\u5668\u53ef\u80fd\u653e\u5f03\u7d22\u5f15\u3002<\/p>\n\n\n\n
          25. \u5b57\u7b26\u4e32\u7c7b\u578b\u5b57\u6bb5\u5728 WHERE<\/code> \u4e2d\u4f7f\u7528\u5f15\u53f7<\/h3>\n\n\n\n
          \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          SELECT * FROM user WHERE userid = 123;<\/code><\/pre>\n\n\n\n
          \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          SELECT * FROM user WHERE userid = '123';<\/code><\/pre>\n\n\n\n
          26. \u907f\u514d\u8fd4\u56de\u8fc7\u591a\u6570\u636e\u91cf<\/h3>\n\n\n\n
          \u53cd\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          SELECT * FROM LivingInfo WHERE watchId = userId AND watchTime >= DATE_SUB(NOW(), INTERVAL 1 YEAR);<\/code><\/pre>\n\n\n\n
          \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          -- \u5206\u9875\u67e5\u8be2
          SELECT * FROM LivingInfo WHERE watchId = userId AND watchTime >= DATE_SUB(NOW(), INTERVAL 1 YEAR) LIMIT offset, pageSize;<\/code><\/pre>\n\n\n\n
          \u7406\u7531<\/strong>\uff1a
               \u67e5\u8be2\u6548\u7387\uff1a\u5f53\u8fd4\u56de\u7684\u6570\u636e\u91cf\u8fc7\u5927\u65f6\uff0c\u67e5\u8be2\u6240\u9700\u7684\u65f6\u95f4\u4f1a\u663e\u8457\u589e\u52a0\uff0c\u5bfc\u81f4\u6570\u636e\u5e93\u6027\u80fd\u4e0b\u964d\u3002
               \u901a\u8fc7\u9650\u5236\u8fd4\u56de\u7684\u6570\u636e\u91cf\uff0c\u53ef\u4ee5\u7f29\u77ed\u67e5\u8be2\u65f6\u95f4\uff0c\u63d0\u9ad8\u6570\u636e\u5e93\u54cd\u5e94\u901f\u5ea6\u3002
               \u7f51\u7edc\u4f20\u8f93\uff1a\u5927\u91cf\u6570\u636e\u7684\u4f20\u8f93\u4f1a\u5360\u7528\u7f51\u7edc\u5e26\u5bbd\uff0c\u53ef\u80fd\u5bfc\u81f4\u7f51\u7edc\u62e5\u5835\u548c\u5ef6\u8fdf\u3002
               \u51cf\u5c11\u8fd4\u56de\u7684\u6570\u636e\u91cf\u53ef\u4ee5\u964d\u4f4e\u7f51\u7edc\u4f20\u8f93\u7684\u8d1f\u62c5\uff0c\u63d0\u9ad8\u6570\u636e\u4f20\u8f93\u6548\u7387\u3002\u3002<\/p>\n\n\n\n
          \u5728 SQL \u4f18\u5316\u65b9\u9762\uff0c\u9664\u4e86\u5df2\u7ecf\u5217\u4e3e\u768426\u4e2a\u6280\u5de7\uff0c\u8fd9\u91cc\u518d\u8865\u51459\u4e2a\u6280\u5de7\uff0c\u4f7f\u4f18\u5316\u70b9\u8fbe\u523035\u6761\u3002\u8fd9\u4e9b\u8865\u5145\u6280\u5de7\u5305\u542b\u4e00\u4e9b\u66f4\u52a0\u7ec6\u5316\u7684\u5b9e\u8df5\uff0c\u5e2e\u52a9\u8fdb\u4e00\u6b65\u63d0\u5347 SQL \u67e5\u8be2\u7684\u6548\u7387\uff1a<\/p>\n\n\n\n
          \n\n\n\n
          27. \u5408\u7406\u5229\u7528\u89c6\u56fe\uff08View\uff09\u8fdb\u884c\u590d\u6742\u67e5\u8be2<\/h3>\n\n\n\n
          \u5982\u679c\u4e00\u4e2a\u590d\u6742\u67e5\u8be2\u9700\u8981\u9891\u7e41\u4f7f\u7528\uff0c\u53ef\u4ee5\u8003\u8651\u521b\u5efa\u89c6\u56fe\uff0c\u4ee5\u7b80\u5316\u67e5\u8be2\u7ed3\u6784\u5e76\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002
          \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          CREATE VIEW view_user_orders AS
          SELECT u.id, u.name, o.order_id, o.amount
          FROM user u JOIN orders o ON u.id = o.user_id;
          -- \u4f7f\u7528\u89c6\u56fe\u67e5\u8be2
          SELECT * FROM view_user_orders WHERE amount > 100;<\/code><\/pre>\n\n\n\n
          28. \u4f7f\u7528\u8868\u5206\u533a\uff08Partitioning\uff09\u4f18\u5316\u5927\u8868\u6027\u80fd<\/h3>\n\n\n\n
          \u5bf9\u4e8e\u6570\u636e\u91cf\u8f83\u5927\u7684\u8868\uff0c\u901a\u8fc7\u5206\u533a\u53ef\u4ee5\u6709\u6548\u63d0\u5347\u67e5\u8be2\u6548\u7387\u3002\u8868\u5206\u533a\u53ef\u4ee5\u6309\u65e5\u671f\u3001\u6570\u503c\u8303\u56f4\u7b49\u65b9\u5f0f\u8fdb\u884c\u5206\u5272\u3002
          \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          CREATE TABLE sales (
              sale_id INT,
              sale_date DATE,
              amount DECIMAL(10,2)
          ) PARTITION BY RANGE (YEAR(sale_date)) (
              PARTITION p2019 VALUES LESS THAN (2020),
              PARTITION p2020 VALUES LESS THAN (2021),
              PARTITION p2021 VALUES LESS THAN (2022)
          );<\/code><\/pre>\n\n\n\n
          29. \u5408\u7406\u4f7f\u7528\u5b58\u50a8\u8fc7\u7a0b\uff08Stored Procedure\uff09\u6765\u51cf\u5c11\u591a\u6b21 SQL \u4ea4\u4e92<\/h3>\n\n\n\n
          \u5c06\u591a\u6b65\u64cd\u4f5c\u5199\u5165\u5b58\u50a8\u8fc7\u7a0b\uff0c\u53ef\u4ee5\u51cf\u5c11\u5ba2\u6237\u7aef\u4e0e\u6570\u636e\u5e93\u4e4b\u95f4\u7684\u591a\u6b21\u4ea4\u4e92\uff0c\u63d0\u9ad8\u6548\u7387\u3002
          \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          CREATE PROCEDURE update_and_select(IN user_id INT)
          BEGIN
              UPDATE users SET last_login = NOW() WHERE id = user_id;
              SELECT * FROM users WHERE id = user_id;
          END;<\/code><\/pre>\n\n\n\n
          30. \u5bf9\u9891\u7e41\u53d8\u66f4\u7684\u6570\u636e\u4f7f\u7528\u7f13\u5b58<\/h3>\n\n\n\n
          \u5bf9\u4e8e\u9891\u7e41\u67e5\u8be2\u7684\u9759\u6001\u6216\u76f8\u5bf9\u7a33\u5b9a\u7684\u6570\u636e\uff0c\u53ef\u8003\u8651\u5c06\u67e5\u8be2\u7ed3\u679c\u5b58\u653e\u5230\u7f13\u5b58\uff08\u5982 Redis\uff09\u4e2d\uff0c\u4ee5\u51cf\u8f7b\u6570\u636e\u5e93\u7684\u8d1f\u62c5\u3002<\/p>\n\n\n\n
          31. \u4f7f\u7528\u9002\u5f53\u7684\u9694\u79bb\u7ea7\u522b<\/h3>\n\n\n\n
          \u5728\u9ad8\u5e76\u53d1\u73af\u5883\u4e2d\u9009\u62e9\u9002\u5f53\u7684\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\uff08\u5982 READ COMMITTED\uff09\uff0c\u53ef\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u9501\u7ade\u4e89\u548c\u963b\u585e\uff0c\u63d0\u5347\u5e76\u53d1\u6548\u7387\u3002<\/p>\n\n\n\n
          32. \u4f7f\u7528\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b<\/h3>\n\n\n\n
          \u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u4f1a\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\uff0c\u63d0\u5347\u5904\u7406\u901f\u5ea6\u3002\u4f8b\u5982\uff1aTINYINT<\/code>\uff081\u5b57\u8282\uff09\u4ee3\u66ffINT<\/code>\uff084\u5b57\u8282\uff09\uff0cVARCHAR(50)<\/code>\u4ee3\u66ffCHAR(50)<\/code>\uff0c\u5b58\u50a8\u957f\u5ea6\u5c3d\u53ef\u80fd\u7cbe\u786e\u5339\u914d\u4e1a\u52a1\u9700\u6c42\u3002<\/p>\n\n\n\n
          33. \u907f\u514d\u9891\u7e41\u66f4\u65b0\u7d22\u5f15\u5217<\/h3>\n\n\n\n
          \u5728\u9ad8\u5e76\u53d1\u5199\u64cd\u4f5c\u7684\u573a\u666f\u4e2d\uff0c\u9891\u7e41\u66f4\u65b0\u7d22\u5f15\u5b57\u6bb5\u4f1a\u5bfc\u81f4\u7d22\u5f15\u91cd\u5efa\uff0c\u5f71\u54cd\u6027\u80fd\u3002\u5982\u679c\u5b57\u6bb5\u53d8\u52a8\u9891\u7e41\u4e14\u65e0\u67e5\u8be2\u9700\u6c42\uff0c\u5efa\u8bae\u907f\u514d\u5bf9\u8be5\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u3002<\/p>\n\n\n\n
          34. \u907f\u514d\u5728\u4e8b\u52a1\u4e2d\u6267\u884c\u975e\u5fc5\u8981\u7684\u64cd\u4f5c<\/h3>\n\n\n\n
          \u5728\u4e8b\u52a1\u4e2d\u5e94\u907f\u514d\u6267\u884c\u8017\u65f6\u64cd\u4f5c\uff0c\u6bd4\u5982\u7f51\u7edc\u8bf7\u6c42\u6216\u590d\u6742\u8ba1\u7b97\uff0c\u4ee5\u51cf\u5c11\u9501\u7684\u6301\u6709\u65f6\u95f4\u3002\u4f18\u5148\u786e\u4fdd\u4e8b\u52a1\u64cd\u4f5c\u96c6\u4e2d\u5728\u5fc5\u8981\u7684\u6570\u636e\u53d8\u66f4\u4e0a\u3002<\/p>\n\n\n\n
          35. \u4f7f\u7528\u6279\u91cf\u66f4\u65b0\u6216\u5220\u9664<\/h3>\n\n\n\n
          \u5bf9\u4e8e\u6279\u91cf\u66f4\u65b0\u6216\u5220\u9664\u6570\u636e\uff0c\u907f\u514d\u4e00\u6b21\u6027\u64cd\u4f5c\u5927\u91cf\u8bb0\u5f55\u3002\u53ef\u4ee5\u5206\u6279\u6b21\u6267\u884c\uff0c\u4ee5\u51cf\u5c11\u9501\u5b9a\u65f6\u95f4\uff0c\u51cf\u8f7b\u7cfb\u7edf\u538b\u529b\u3002
          \u6b63\u4f8b\uff1a<\/strong><\/p>\n\n\n\n
          -- \u5206\u6279\u5220\u9664
          DELETE FROM orders WHERE status = 'obsolete' LIMIT 1000;<\/code><\/pre>\n\n\n\n
          \n\n\n\n
          \u8fd9\u4e9b SQL \u4f18\u5316\u6280\u5de7\u6db5\u76d6\u4e86\u6570\u636e\u5e93\u7684\u65b9\u65b9\u9762\u9762\u3002\u5e0c\u671b\u8fd9\u4e9b\u8865\u5145\u7684\u4f18\u5316\u5efa\u8bae\u53ef\u4ee5\u5e2e\u52a9\u8fdb\u4e00\u6b65\u63d0\u5347\u6570\u636e\u5e93\u7684\u6574\u4f53\u6027\u80fd\u548c\u7a33\u5b9a\u6027\u3002<\/p>\n\n\n\n
          <\/p>\n","protected":false},"excerpt":{"rendered":"
          SQL\u4f18\u5316\u768435\u4e2a\u5c0f\u6280\u5de7 \u524d\u8a00 1. \u907f\u514d\u4f7f\u7528 SELECT *\uff0c\u4f7f\u7528\u5177\u4f53\u5b57\u6bb5 \u53cd\u4f8b\uff1a \u6b63\u4f8b\uff1a \u4f7f\u7528 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1501","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1501","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/comments?post=1501"}],"version-history":[{"count":1,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1501\/revisions"}],"predecessor-version":[{"id":1502,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/posts\/1501\/revisions\/1502"}],"wp:attachment":[{"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/media?parent=1501"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/categories?post=1501"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/note.ui11.cc\/index.php\/wp-json\/wp\/v2\/tags?post=1501"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}