{"id":2558,"date":"2025-10-11T12:16:41","date_gmt":"2025-10-11T04:16:41","guid":{"rendered":"https:\/\/note.ui11.cc\/?p=2558"},"modified":"2025-10-11T12:16:42","modified_gmt":"2025-10-11T04:16:42","slug":"mysql%e7%b4%a2%e5%bc%95-2","status":"publish","type":"post","link":"https:\/\/note.ui11.cc\/index.php\/2025\/10\/11\/mysql%e7%b4%a2%e5%bc%95-2\/","title":{"rendered":"Mysql\u7d22\u5f15"},"content":{"rendered":"\n<p>\u4ec0\u4e48\u662f\u7d22\u5f15\uff1f<\/p>\n\n\n\n<p>\u5b98\u65b9\u5b9a\u4e49\uff1a\u7d22\u5f15\u662f\u4e00\u79cd\u5e2e\u52a9mysql\u63d0\u9ad8\u67e5\u8be2\u7684\u6570\u636e\u7ed3\u6784<\/p>\n\n\n\n<p>\u7d22\u5f15\u7f3a\u70b9\uff1a\u7d22\u5f15\u9700\u8981\u8017\u8d39\u6570\u636e\u8d44\u6e90\uff0c\u7d22\u5f15\u9700\u8981\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\uff0c\u5f53\u5bf9\u8868\u7684\u6570\u636e\u8fdb\u884c\u589e\u5220\u6539\u7684\u65f6\u5019\uff0c\u901f\u5ea6\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\uff08\u5220\u9664\u4fee\u6539\u589e\u52a0\/\u4e00\u4e2a\u5143\u7d20\u53ef\u80fd\u4f1a\u5bf9\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u8fdb\u884c\u91cd\u6392\u5e8f\uff09<\/p>\n\n\n\n<p>\u7d22\u5f15\u5206\u7c7b\uff1a<\/p>\n\n\n\n<p>\u4e3b\u952e\u7d22\u5f15\uff1a\u8bbe\u5b9a\u4e3a\u4e3b\u952e\u540e\u6570\u636e\u4f1a\u81ea\u52a8\u5efa\u7acb\u7d22\u5f15\uff0cinnodb\u4e3a\u805a\u7c07\u7d22\u5f15\uff0c\u4e3b\u952e\u7d22\u5f15\u5217\u503c\u4e0d\u80fd\u4e3a\u7a7a<\/p>\n\n\n\n<p>\u5355\u5217\u7d22\u5f15\uff1a\u5373\u4e00\u4e2a\u7d22\u5f15\u5305\u542b\u5355\u4e2a\u5217\uff0c\u4e00\u4e2a\u8868\u53ef\u4ee5\u6709\u591a\u4e2a\u5355\u5217\u7d22\u5f15<\/p>\n\n\n\n<p>\u552f\u4e00\u7d22\u5f15\uff1a\u7d22\u5f15\u5217\u7684\u503c\u5fc5\u987b\u552f\u4e00\uff0c\u4f46\u5141\u8bb8\u6709\u7a7a\u503c\uff0c\u53ea\u80fd\u6709\u4e00\u4e2a<\/p>\n\n\n\n<p>\u590d\u5408\u7d22\u5f15\uff1a\u5373\u4e00\u4e2a\u7d22\u5f15\u5305\u542b\u591a\u4e2a\u5217<\/p>\n\n\n\n<p><strong>\u4e3b\u952e\u7d22\u5f15\uff1a\u4e3b\u952e\u7d22\u5f15\u5728\u5efa\u8868\u7684\u65f6\u5019\u81ea\u52a8\u521b\u5efa\uff0c\u5728\u4e3b\u6d41\u6570\u636e\u5e93\u5f53\u4f60\u4e3a\u5b57\u6bb5\u5b9a\u4e49\u00a0<code>primary key<\/code>\u00a0\u65f6\uff0c\u90fd\u4f1a\u81ea\u52a8\u521b\u5efa\u5bf9\u5e94\u7684\u4e3b\u952e\u7d22\u5f15<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u8868\u4e2d\u5b58\u5728\u4e00\u4e2a <code>NOT NULL<\/code> \u4e14 <code>UNIQUE<\/code> \u7684\u5b57\u6bb5\uff0cInnoDB \u4f1a\u4f7f\u7528\u8be5\u5b57\u6bb5\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u81ea\u52a8\u751f\u6210\u9690\u85cf\u4e3b\u952e\u5217\uff08ROW_ID\uff09<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5982\u679c\u6ca1\u6709\u4e3b\u952e\uff0c\u4e5f\u6ca1\u6709\u5408\u9002\u7684\u552f\u4e00\u7d22\u5f15\uff0cInnoDB \u4f1a\u81ea\u52a8\u751f\u6210\u4e00\u4e2a\u9690\u85cf\u5217 <code>ROW_ID<\/code>\uff0c\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">create table t_user(<br>    id varchar(32) primary key ,<br>    name varchar(32)<br>);<\/pre>\n\n\n\n<p>\u67e5\u770b\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">show index from t_user ;<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-1024x85.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"85\" data-original=\"https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-1024x85.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2559\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u666e\u901a\u7d22\u5f15\u521b\u5efa\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<p>\u4e00\u79cd\u662f\u5efa\u8868\u7684\u65f6\u5019\uff0c\u53e6\u4e00\u79cd\u662f\u5efa\u8868\u4e4b\u540e\u8fdb\u884c\u521b\u5efa<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">\u5efa\u8868\u540e\u8fd9\u6837\u521b\u5efa\uff1a<br>create index index_name on t_user(name);<\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-1-1024x111.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"111\" data-original=\"https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-1-1024x111.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2560\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u5728show index from t_user \u73b0\u5728\u5c31\u6709\u4e24\u4e2a\u7d22\u5f15<\/p>\n\n\n\n<p>\u8fd8\u53ef\u4ee5\u8fd9\u6837\uff1aalter table t_user add column age int, add index index_age(age);<\/p>\n\n\n\n<p>\u5efa\u8868\u65f6\u521b\u5efa\u7d22\u5f15\uff1a  <\/p>\n\n\n\n<p>create table t_user( id varchar(20) primary key,name varchar(20) ,ley (name));  \/\/\u8fd9\u91cc\u5c31\u4e3aname\u5b57\u6bb5\u81ea\u52a8\u521b\u5efa\u4e00\u4e2a\u7d22\u5f15\uff0c\u7d22\u5f15\u540d\u79f0\u4e0d\u53ef\u6307\u5b9a<\/p>\n\n\n\n<p><strong>\u552f\u4e00\u7d22\u5f15\uff1a<\/strong><\/p>\n\n\n\n<p>\u5efa\u8868\u7684\u65f6\u5019\u521b\u5efa<\/p>\n\n\n\n<p>create table t_user(id varchar(32) primary key ,name varchar(32),unique(name) )<\/p>\n\n\n\n<p>\u5efa\u8868\u540e\u521b\u5efa\u552f\u4e00\u7d22\u5f15\uff1a<\/p>\n\n\n\n<p>create index unique nameindex on t_user(name);<\/p>\n\n\n\n<p>\u5220\u9664\u7d22\u5f15\uff1a drop index nameindex  on t_user<\/p>\n\n\n\n<p><strong>\u590d\u5408\u7d22\u5f15\uff1a<\/strong><\/p>\n\n\n\n<p>\u590d\u5408\u7d22\u5f15\u4e2d\u7684\u5b57\u6bb5\u987a\u5e8f<strong>\u7edd\u5bf9\u4e0d\u662f\u968f\u4fbf\u586b\u7684<\/strong>\uff0c\u5b83\u5bf9\u67e5\u8be2\u6027\u80fd\u548c\u7d22\u5f15\u662f\u5426\u80fd\u88ab\u6709\u6548\u4f7f\u7528\u6709\u975e\u5e38\u5173\u952e\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-2-1024x618.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"618\" data-original=\"https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-2-1024x618.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2561\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-3.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"843\" height=\"308\" data-original=\"https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-3.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2562\"  sizes=\"auto, (max-width: 843px) 100vw, 843px\" \/><\/div><\/figure>\n\n\n\n<p>\u590d\u5408\u7d22\u5f15\uff1a<\/p>\n\n\n\n<p>\u5efa\u8868\u65f6\u521b\u5efa\uff1a<\/p>\n\n\n\n<p>create table t_user(id varchar(20) peimary key ,name varchar(32) ,age int, key(name ,age));<\/p>\n\n\n\n<p>\u5efa\u8868\u540e\u521b\u5efa\uff1acreate index nameageindex on t_user(name,age);<\/p>\n\n\n\n<p><strong>\u7d22\u5f15\u5e95\u5c42\u539f\u7406\uff1a<\/strong><\/p>\n\n\n\n<p>\u8fd9\u4e2a\u8868\u5728\u521b\u5efa\u7684\u65f6\u5019\u5b9a\u4e49\u4e3b\u952e\u662fprimary key ,\u9ed8\u8ba4\u6709\u4e00\u4e2a\u4e3b\u952e\u7d22\u5f15<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-4-1024x546.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"546\" data-original=\"https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-4-1024x546.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2563\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-5-1024x556.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"556\" data-original=\"https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-5-1024x556.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2564\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p><strong>B\u6811\u548cB+\u6811\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u6570\u636e\u5b58\u50a8\u4f4d\u7f6e\u548c\u67e5\u8be2\u6548\u7387\uff1aB\u6811\u7684\u6240\u6709\u8282\u70b9\u90fd\u5b58\u50a8\u6570\u636e\uff0c\u800cB+\u6811\u53ea\u6709\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u6570\u636e\uff0c\u975e\u53f6\u5b50\u8282\u70b9\u4ec5\u7528\u4e8e\u7d22\u5f15\u3002<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-6-1024x483.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"483\" data-original=\"https:\/\/note.ui11.cc\/wp-content\/uploads\/2025\/10\/image-6-1024x483.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2565\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" 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src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2566\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p>\u805a\u7c07\u7d22\u5f15\u548c\u975e\u805a\u7c07\u7d22\u5f15\uff1a<\/p>\n\n\n\n<p>\u805a\u7c07\u7d22\u5f15\uff1a\u5c06\u6570\u636e\u5b58\u50a8\u548c\u7d22\u5f15\u653e\u5230\u4e86\u4e00\u5757\uff0c\u7d22\u5f15\u7ed3\u6784\u7684\u53f6\u5b50\u8282\u70b9\u4fdd\u5b58\u4e86\u884c\u6570\u636e<\/p>\n\n\n\n<p>\u975e\u805a\u7c07\u7d22\u5f15\uff1a\u5c06\u6570\u636e\u4e0e\u7d22\u5f15\u5206\u5f00\u5b58\u50a8\uff0c\u7d22\u5f15\u7ed3\u6784\u7684\u53f6\u5b50\u8282\u70b9\u6307\u5411\u4e86\u6570\u636e\u5bf9\u5e94\u7684\u4f4d\u7f6e\uff01<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' 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