{"id":61663,"date":"2024-10-13T12:44:17","date_gmt":"2024-10-13T04:44:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/61663\/"},"modified":"2024-10-13T12:44:17","modified_gmt":"2024-10-13T04:44:17","slug":"ibm-db2%e6%95%b8%e6%93%9a%e5%ba%absql%e7%b7%a8%e7%a2%bc%e5%84%aa%e5%8c%96%e7%9a%84%e5%9f%ba%e7%a4%8e%e6%95%99%e7%a8%8b%e7%b6%93%e5%85%b8%e7%89%88%ef%bc%81","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/61663\/","title":{"rendered":"IBM DB2\u6578\u64da\u5eabSQL\u7de8\u78bc\u512a\u5316\u7684\u57fa\u790e\u6559\u7a0b\u7d93\u5178\u7248\uff01"},"content":{"rendered":"<h1 id=\"ibm-db2%e6%95%b8%e6%93%9a%e5%ba%absql%e7%b7%a8%e7%a2%bc%e5%84%aa%e5%8c%96%e7%9a%84%e5%9f%ba%e7%a4%8e%e6%95%99%e7%a8%8b%e7%b6%93%e5%85%b8%e7%89%88-jSxGmbIpnU\">IBM DB2\u6578\u64da\u5eabSQL\u7de8\u78bc\u512a\u5316\u7684\u57fa\u790e\u6559\u7a0b\u7d93\u5178\u7248<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u4f01\u696d\u7684\u6210\u529f\u81f3\u95dc\u91cd\u8981\u3002IBM DB2\u4f5c\u70ba\u4e00\u6b3e\u5f37\u5927\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u652f\u6301\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u3002\u7136\u800c\uff0c\u70ba\u4e86\u5145\u5206\u767c\u63eeDB2\u7684\u6f5b\u529b\uff0c\u958b\u767c\u8005\u9700\u8981\u638c\u63e1SQL\u7de8\u78bc\u7684\u512a\u5316\u6280\u5de7\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u57fa\u672c\u7684SQL\u7de8\u78bc\u512a\u5316\u65b9\u6cd5\uff0c\u5e6b\u52a9\u60a8\u63d0\u5347DB2\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002<\/p>\n<h2 id=\"1-%e7%90%86%e8%a7%a3%e5%9f%b7%e8%a1%8c%e8%a8%88%e5%8a%83-jSxGmbIpnU\">1. \u7406\u89e3\u57f7\u884c\u8a08\u5283<\/h2>\n<p>\u5728\u9032\u884cSQL\u512a\u5316\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u4e86\u89e3DB2\u5982\u4f55\u57f7\u884c\u67e5\u8a62\u3002DB2\u4f7f\u7528\u57f7\u884c\u8a08\u5283\u4f86\u6c7a\u5b9a\u5982\u4f55\u8a2a\u554f\u6578\u64da\u3002\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u67e5\u770b\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff1a<\/p>\n<pre><code>EXPLAIN PLAN FOR \nSELECT * FROM your_table WHERE your_condition;<\/code><\/pre>\n<p>\u9019\u5c07\u751f\u6210\u4e00\u500b\u57f7\u884c\u8a08\u5283\uff0c\u5e6b\u52a9\u60a8\u8b58\u5225\u6f5b\u5728\u7684\u6027\u80fd\u74f6\u9838\u3002\u901a\u904e\u5206\u6790\u57f7\u884c\u8a08\u5283\uff0c\u60a8\u53ef\u4ee5\u4e86\u89e3DB2\u662f\u5982\u4f55\u8a2a\u554f\u6578\u64da\u7684\uff0c\u4e26\u6839\u64da\u9700\u8981\u9032\u884c\u8abf\u6574\u3002<\/p>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8%e7%b4%a2%e5%bc%95-jSxGmbIpnU\">2. \u4f7f\u7528\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u3002\u9069\u7576\u7684\u7d22\u5f15\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u7684\u57f7\u884c\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528\u7d22\u5f15\u7684\u5efa\u8b70\uff1a<\/p>\n<ul>\n<li>\u70ba\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u5275\u5efa\u7d22\u5f15\u3002<\/li>\n<li>\u907f\u514d\u5728\u4f4e\u57fa\u6578\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u56e0\u70ba\u9019\u6a23\u7684\u7d22\u5f15\u53ef\u80fd\u4e0d\u6703\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li>\u5b9a\u671f\u91cd\u5efa\u548c\u91cd\u65b0\u7d44\u7e54\u7d22\u5f15\uff0c\u4ee5\u4fdd\u6301\u5176\u6548\u7387\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code>CREATE INDEX idx_your_column ON your_table(your_column);<\/code><\/pre>\n<h2 id=\"3-%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%aa%9e%e5%8f%a5-jSxGmbIpnU\">3. \u512a\u5316\u67e5\u8a62\u8a9e\u53e5<\/h2>\n<p>\u7de8\u5beb\u9ad8\u6548\u7684SQL\u67e5\u8a62\u8a9e\u53e5\u662f\u512a\u5316\u7684\u53e6\u4e00\u500b\u91cd\u8981\u65b9\u9762\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u512a\u5316\u67e5\u8a62\u7684\u6280\u5de7\uff1a<\/p>\n<ul>\n<li>\u907f\u514d\u4f7f\u7528SELECT *\uff0c\u800c\u662f\u9078\u64c7\u9700\u8981\u7684\u5217\u3002<\/li>\n<li>\u4f7f\u7528JOIN\u800c\u4e0d\u662f\u5b50\u67e5\u8a62\uff0c\u56e0\u70baJOIN\u901a\u5e38\u6027\u80fd\u66f4\u597d\u3002<\/li>\n<li>\u4f7f\u7528WHERE\u5b50\u53e5\u904e\u6ffe\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u6bd4\u4f7f\u7528SELECT *\u66f4\u9ad8\u6548\uff1a<\/p>\n<pre><code>SELECT column1, column2 FROM your_table WHERE your_condition;<\/code><\/pre>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8%e9%81%a9%e7%95%b6%e7%9a%84%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-jSxGmbIpnU\">4. \u4f7f\u7528\u9069\u7576\u7684\u6578\u64da\u985e\u578b<\/h2>\n<p>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u4e26\u63d0\u9ad8\u6027\u80fd\u3002DB2\u652f\u6301\u591a\u7a2e\u6578\u64da\u985e\u578b\uff0c\u9078\u64c7\u5408\u9069\u7684\u985e\u578b\u53ef\u4ee5\u5e6b\u52a9\u60a8\u512a\u5316\u6578\u64da\u5eab\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u6574\u6578\u6578\u64da\uff0c\u4f7f\u7528INTEGER\u800c\u4e0d\u662fVARCHAR\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h2 id=\"5-%e5%ae%9a%e6%9c%9f%e7%b6%ad%e8%ad%b7%e6%95%b8%e6%93%9a%e5%ba%ab-jSxGmbIpnU\">5. \u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab<\/h2>\n<p>\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\u662f\u78ba\u4fdd\u5176\u6027\u80fd\u7684\u95dc\u9375\u3002\u9019\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u5b9a\u671f\u5099\u4efd\u6578\u64da\u5eab\u3002<\/li>\n<li>\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002<\/li>\n<li>\u76e3\u63a7\u6027\u80fd\u6307\u6a19\uff0c\u53ca\u6642\u8abf\u6574\u914d\u7f6e\u3002<\/li>\n<\/ul>\n<p>\u9019\u4e9b\u7dad\u8b77\u5de5\u4f5c\u53ef\u4ee5\u5e6b\u52a9\u60a8\u4fdd\u6301\u6578\u64da\u5eab\u7684\u9ad8\u6548\u904b\u884c\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-jSxGmbIpnU\">\u7e3d\u7d50<\/h2>\n<p>\u901a\u904e\u7406\u89e3\u57f7\u884c\u8a08\u5283\u3001\u4f7f\u7528\u7d22\u5f15\u3001\u512a\u5316\u67e5\u8a62\u8a9e\u53e5\u3001\u9078\u64c7\u9069\u7576\u7684\u6578\u64da\u985e\u578b\u4ee5\u53ca\u5b9a\u671f\u7dad\u8b77\u6578\u64da\u5eab\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8IBM DB2\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u9019\u4e9b\u57fa\u672c\u7684SQL\u7de8\u78bc\u512a\u5316\u6280\u5de7\u4e0d\u50c5\u80fd\u5e6b\u52a9\u60a8\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u78ba\u4fdd\u6578\u64da\u5eab\u7684\u7a69\u5b9a\u904b\u884c\u3002\u5982\u679c\u60a8\u9700\u8981\u66f4\u591a\u7684\u8cc7\u6e90\u6216\u652f\u6301\uff0c\u8acb\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u6258\u7ba1\u60a8\u7684\u6578\u64da\u5eab\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u53ef\u9760\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22IBM DB2\u6578\u64da\u5eabSQL\u7de8\u78bc\u512a\u5316\u7684\u57fa\u790e\u6559\u7a0b\u7d93\u5178\u7248\uff0c\u63d0\u5347\u67e5\u8a62\u6027\u80fd\uff0c\u638c\u63e1\u6700\u4f73\u5be6\u8e10\uff0c\u5be6\u73fe\u9ad8\u6548\u6578\u64da\u7ba1\u7406\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-61663","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61663","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=61663"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61663\/revisions"}],"predecessor-version":[{"id":61664,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/61663\/revisions\/61664"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=61663"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=61663"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=61663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}