{"id":168351,"date":"2024-11-06T11:39:21","date_gmt":"2024-11-06T03:39:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168351\/"},"modified":"2024-11-06T11:39:22","modified_gmt":"2024-11-06T03:39:22","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e6%93%8d%e4%bd%9c%e6%95%88%e7%8e%87-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168351\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u512a\u5316\u63d0\u9ad8\u6578\u64da\u64cd\u4f5c\u6548\u7387 (sql \u6578\u64da\u5eab\u512a\u5316)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%84%aa%e5%8c%96%e6%8f%90%e9%ab%98%e6%95%b8%e6%93%9a%e6%93%8d%e4%bd%9c%e6%95%88%e7%8e%87-qxbCmDwGbz\">SQL \u6578\u64da\u5eab\u512a\u5316\u63d0\u9ad8\u6578\u64da\u64cd\u4f5c\u6548\u7387<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002SQL \u6578\u64da\u5eab\u512a\u5316\u662f\u63d0\u5347\u6578\u64da\u64cd\u4f5c\u6548\u7387\u7684\u95dc\u9375\u6b65\u9a5f\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u6709\u6548\u7684 SQL \u6578\u64da\u5eab\u512a\u5316\u6280\u8853\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002<\/p>\n<h2 id=\"1-%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8-qxbCmDwGbz\">1. \u7d22\u5f15\u7684\u4f7f\u7528<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\u7684\u6709\u6548\u5de5\u5177\u3002\u901a\u904e\u5728\u8868\u7684\u7279\u5b9a\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name (column1, column2, ...);<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u904e\u591a\u7684\u7d22\u5f15\u6703\u5f71\u97ff\u6578\u64da\u63d2\u5165\u548c\u66f4\u65b0\u7684\u6027\u80fd\uff0c\u56e0\u6b64\u5728\u4f7f\u7528\u7d22\u5f15\u6642\u9700\u8981\u8b39\u614e\u5e73\u8861\u3002<\/p>\n<h2 id=\"2-%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-qxbCmDwGbz\">2. \u67e5\u8a62\u512a\u5316<\/h2>\n<p>\u64b0\u5beb\u9ad8\u6548\u7684 SQL \u67e5\u8a62\u662f\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u7684\u53e6\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u67e5\u8a62\u512a\u5316\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li>\u907f\u514d\u4f7f\u7528 SELECT *\uff0c\u800c\u662f\u9078\u64c7\u9700\u8981\u7684\u5217\u3002<\/li>\n<li>\u4f7f\u7528 JOIN \u800c\u4e0d\u662f\u5b50\u67e5\u8a62\uff0c\u56e0\u70ba JOIN \u901a\u5e38\u66f4\u9ad8\u6548\u3002<\/li>\n<li>\u4f7f\u7528 WHERE \u5b50\u53e5\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u4f7f\u7528\u4e86 JOIN \u548c WHERE \u5b50\u53e5\u4f86\u63d0\u9ad8\u6548\u7387\uff1a<\/p>\n<pre><code>SELECT a.column1, b.column2 \nFROM table_a a \nJOIN table_b b ON a.id = b.a_id \nWHERE a.status = 'active';<\/code><\/pre>\n<h2 id=\"3-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%ad%e8%a8%88-qxbCmDwGbz\">3. \u6578\u64da\u5eab\u8a2d\u8a08<\/h2>\n<p>\u826f\u597d\u7684\u6578\u64da\u5eab\u8a2d\u8a08\u662f\u63d0\u9ad8\u6027\u80fd\u7684\u57fa\u790e\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u8a2d\u8a08\u4e0a\u7684\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u6b63\u898f\u5316\u6578\u64da\u4ee5\u6d88\u9664\u5197\u9918\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u9069\u5ea6\u7684\u53cd\u6b63\u898f\u5316\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/li>\n<li>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\uff0c\u907f\u514d\u4f7f\u7528\u904e\u5927\u7684\u6578\u64da\u985e\u578b\u3002<\/li>\n<li>\u5408\u7406\u5283\u5206\u8868\uff0c\u907f\u514d\u55ae\u4e00\u8868\u904e\u65bc\u9f90\u5927\u3002<\/li>\n<\/ul>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8%e7%b7%a9%e5%ad%98-qxbCmDwGbz\">4. \u4f7f\u7528\u7de9\u5b58<\/h2>\n<p>\u7de9\u5b58\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u901a\u904e\u5c07\u5e38\u7528\u67e5\u8a62\u7684\u7d50\u679c\u5b58\u5132\u5728\u5167\u5b58\u4e2d\uff0c\u53ef\u4ee5\u6e1b\u5c11\u5c0d\u6578\u64da\u5eab\u7684\u76f4\u63a5\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 Redis \u6216 Memcached \u4f86\u7de9\u5b58\u67e5\u8a62\u7d50\u679c\u3002<\/p>\n<h2 id=\"5-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7-qxbCmDwGbz\">5. \u5b9a\u671f\u7dad\u8b77<\/h2>\n<p>\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\u662f\u4fdd\u6301\u5176\u6027\u80fd\u7684\u95dc\u9375\u3002\u9019\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u5b9a\u671f\u91cd\u5efa\u7d22\u5f15\u4ee5\u6d88\u9664\u788e\u7247\u3002<\/li>\n<li>\u66f4\u65b0\u7d71\u8a08\u4fe1\u606f\u4ee5\u5e6b\u52a9\u67e5\u8a62\u512a\u5316\u5668\u505a\u51fa\u66f4\u597d\u7684\u6c7a\u7b56\u3002<\/li>\n<li>\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u548c\u8868\u3002<\/li>\n<\/ul>\n<h2 id=\"6-%e7%9b%a3%e6%8e%a7%e5%92%8c%e5%88%86%e6%9e%90-qxbCmDwGbz\">6. \u76e3\u63a7\u548c\u5206\u6790<\/h2>\n<p>\u4f7f\u7528\u6578\u64da\u5eab\u76e3\u63a7\u5de5\u5177\u4f86\u5206\u6790\u67e5\u8a62\u6027\u80fd\u548c\u8cc7\u6e90\u4f7f\u7528\u60c5\u6cc1\u3002\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u6027\u80fd\u74f6\u9838\uff0c\u4e26\u63d0\u4f9b\u512a\u5316\u5efa\u8b70\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 SQL Server Profiler \u6216 MySQL \u7684\u6162\u67e5\u8a62\u65e5\u8a8c\u4f86\u627e\u51fa\u9700\u8981\u512a\u5316\u7684\u67e5\u8a62\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qxbCmDwGbz\">\u7e3d\u7d50<\/h2>\n<p>SQL \u6578\u64da\u5eab\u512a\u5316\u662f\u4e00\u500b\u6301\u7e8c\u7684\u904e\u7a0b\uff0c\u6d89\u53ca\u7d22\u5f15\u4f7f\u7528\u3001\u67e5\u8a62\u512a\u5316\u3001\u6578\u64da\u5eab\u8a2d\u8a08\u3001\u7de9\u5b58\u7b56\u7565\u3001\u5b9a\u671f\u7dad\u8b77\u4ee5\u53ca\u76e3\u63a7\u5206\u6790\u7b49\u591a\u500b\u65b9\u9762\u3002\u901a\u904e\u5be6\u65bd\u9019\u4e9b\u6700\u4f73\u5be6\u8e10\uff0c\u958b\u767c\u8005\u548c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u64cd\u4f5c\u7684\u6548\u7387\uff0c\u5f9e\u800c\u63d0\u5347\u6574\u9ad4\u7cfb\u7d71\u7684\u6027\u80fd\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\u4ee5\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63d0\u5347SQL\u6578\u64da\u5eab\u6027\u80fd\uff0c\u512a\u5316\u67e5\u8a62\u548c\u6578\u64da\u7d50\u69cb\uff0c\u986f\u8457\u63d0\u9ad8\u6578\u64da\u64cd\u4f5c\u6548\u7387\uff0c\u78ba\u4fdd\u7cfb\u7d71\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-168351","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168351","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=168351"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168351\/revisions"}],"predecessor-version":[{"id":168352,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168351\/revisions\/168352"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}