{"id":60275,"date":"2024-10-13T01:30:24","date_gmt":"2024-10-12T17:30:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60275\/"},"modified":"2024-10-13T01:30:24","modified_gmt":"2024-10-12T17:30:24","slug":"db2-9-7-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e7%9a%84sql%e5%85%bc%e5%ae%b9%e6%80%a7%e7%9a%84%e8%a1%a8%e7%8f%be%e6%9c%89%e5%93%aa%e4%ba%9b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60275\/","title":{"rendered":"DB2 9.7 \u6578\u64da\u5eab\u4e2d\u7684SQL\u517c\u5bb9\u6027\u7684\u8868\u73fe\u6709\u54ea\u4e9b\uff1f"},"content":{"rendered":"

DB2 9.7 \u6578\u64da\u5eab\u4e2d\u7684SQL\u517c\u5bb9\u6027\u7684\u8868\u73fe\u6709\u54ea\u4e9b\uff1f<\/h1>\n

\u5728\u7576\u4eca\u7684\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u6700\u70ba\u5ee3\u6cdb\u4f7f\u7528\u7684\u8a9e\u8a00\u4e4b\u4e00\u3002IBM \u7684 DB2 \u6578\u64da\u5eab\u7cfb\u7d71\u81ea\u5176\u8a95\u751f\u4ee5\u4f86\uff0c\u4fbf\u81f4\u529b\u65bc\u63d0\u4f9b\u5f37\u5927\u7684 SQL \u652f\u6301\u3002DB2 9.7 \u7248\u672c\u4f5c\u70ba\u4e00\u500b\u91cd\u8981\u7684\u91cc\u7a0b\u7891\uff0c\u5c0d SQL \u7684\u517c\u5bb9\u6027\u9032\u884c\u4e86\u591a\u65b9\u9762\u7684\u6539\u9032\u548c\u589e\u5f37\u3002\u672c\u6587\u5c07\u63a2\u8a0e DB2 9.7 \u4e2d SQL \u517c\u5bb9\u6027\u7684\u8868\u73fe\u53ca\u5176\u5f71\u97ff\u3002<\/p>\n

1. SQL \u6a19\u6e96\u7684\u652f\u6301<\/h2>\n

DB2 9.7 \u5728 SQL \u6a19\u6e96\u7684\u652f\u6301\u4e0a\u505a\u51fa\u4e86\u986f\u8457\u7684\u63d0\u5347\u3002\u5b83\u9075\u5faa\u4e86 SQL:2008 \u6a19\u6e96\uff0c\u9019\u610f\u5473\u8457\u7528\u6236\u53ef\u4ee5\u4f7f\u7528\u66f4\u70ba\u5148\u9032\u7684 SQL \u8a9e\u6cd5\u548c\u529f\u80fd\u3002\u4f8b\u5982\uff0cDB2 9.7 \u652f\u6301\u7a97\u53e3\u51fd\u6578\uff08Window Functions\uff09\uff0c\u9019\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u5728\u67e5\u8a62\u4e2d\u9032\u884c\u66f4\u70ba\u8907\u96dc\u7684\u8a08\u7b97\u3002<\/p>\n

SELECT employee_id, salary, \n       AVG(salary) OVER (PARTITION BY department_id) AS avg_salary\nFROM employees;<\/code><\/pre>\n
\u4e0a\u8ff0\u67e5\u8a62\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u7a97\u53e3\u51fd\u6578\u8a08\u7b97\u6bcf\u500b\u90e8\u9580\u7684\u5e73\u5747\u85aa\u8cc7\uff0c\u9019\u5728\u4ee5\u5f80\u7684\u7248\u672c\u4e2d\u662f\u7121\u6cd5\u5be6\u73fe\u7684\u3002<\/p>\n
2. \u589e\u5f37\u7684\u6578\u64da\u985e\u578b\u652f\u6301<\/h2>\n
DB2 9.7 \u5f15\u5165\u4e86\u5c0d\u591a\u7a2e\u65b0\u6578\u64da\u985e\u578b\u7684\u652f\u6301\uff0c\u5305\u62ec\u6642\u9593\u6233\uff08TIMESTAMP\uff09\u3001JSON \u548c XML \u6578\u64da\u985e\u578b\u3002\u9019\u4e9b\u6578\u64da\u985e\u578b\u7684\u5f15\u5165\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u66f4\u9748\u6d3b\u5730\u8655\u7406\u5404\u7a2e\u6578\u64da\u683c\u5f0f\uff0c\u4e26\u4e14\u80fd\u5920\u5728 SQL \u67e5\u8a62\u4e2d\u9032\u884c\u66f4\u70ba\u8907\u96dc\u7684\u64cd\u4f5c\u3002<\/p>\n
SELECT json_data->'name' AS name\nFROM json_table;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0cDB2 9.7 \u5141\u8a31\u7528\u6236\u76f4\u63a5\u5f9e JSON \u6578\u64da\u4e2d\u63d0\u53d6\u4fe1\u606f\uff0c\u9019\u5728\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u4e2d\u5177\u6709\u91cd\u8981\u610f\u7fa9\u3002<\/p>\n
3. \u6539\u9032\u7684\u6027\u80fd\u512a\u5316<\/h2>\n
DB2 9.7 \u5728 SQL \u67e5\u8a62\u7684\u6027\u80fd\u512a\u5316\u65b9\u9762\u4e5f\u505a\u4e86\u5927\u91cf\u5de5\u4f5c\u3002\u901a\u904e\u5f15\u5165\u65b0\u7684\u67e5\u8a62\u512a\u5316\u5668\uff0cDB2 \u80fd\u5920\u66f4\u6709\u6548\u5730\u57f7\u884c\u8907\u96dc\u7684\u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u9ad8\u6574\u9ad4\u6027\u80fd\u3002\u4f8b\u5982\uff0cDB2 9.7 \u652f\u6301\u81ea\u52d5\u7d22\u5f15\uff0c\u9019\u4f7f\u5f97\u6578\u64da\u5eab\u80fd\u5920\u6839\u64da\u67e5\u8a62\u6a21\u5f0f\u81ea\u52d5\u5275\u5efa\u548c\u8abf\u6574\u7d22\u5f15\u3002<\/p>\n
CREATE INDEX idx_employee_name ON employees(name);<\/code><\/pre>\n
\u9019\u6a23\u7684\u7d22\u5f15\u5275\u5efa\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002<\/p>\n
4. \u517c\u5bb9\u6027\u8207\u9077\u79fb<\/h2>\n
\u5c0d\u65bc\u5e0c\u671b\u5f9e\u5176\u4ed6\u6578\u64da\u5eab\u7cfb\u7d71\u9077\u79fb\u5230 DB2 \u7684\u7528\u6236\uff0cDB2 9.7 \u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u529f\u80fd\u4f86\u7c21\u5316\u9019\u4e00\u904e\u7a0b\u3002\u5b83\u652f\u6301\u591a\u7a2e SQL \u8a9e\u6cd5\u7684\u8f49\u63db\uff0c\u4e26\u4e14\u80fd\u5920\u81ea\u52d5\u8abf\u6574\u4e0d\u517c\u5bb9\u7684\u67e5\u8a62\uff0c\u9019\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u66f4\u8f15\u9b06\u5730\u9032\u884c\u6578\u64da\u9077\u79fb\u3002<\/p>\n
5. \u5b89\u5168\u6027\u8207\u5408\u898f\u6027<\/h2>\n
\u5728\u7576\u4eca\u7684\u6578\u64da\u74b0\u5883\u4e2d\uff0c\u5b89\u5168\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002DB2 9.7 \u63d0\u4f9b\u4e86\u591a\u5c64\u6b21\u7684\u5b89\u5168\u6027\u529f\u80fd\uff0c\u5305\u62ec\u884c\u7d1a\u5b89\u5168\uff08Row-Level Security\uff09\u548c\u5217\u7d1a\u5b89\u5168\uff08Column-Level Security\uff09\uff0c\u9019\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u6839\u64da\u9700\u8981\u63a7\u5236\u6578\u64da\u7684\u8a2a\u554f\u6b0a\u9650\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
\u7e3d\u7684\u4f86\u8aaa\uff0cDB2 9.7 \u5728 SQL \u517c\u5bb9\u6027\u65b9\u9762\u7684\u8868\u73fe\u662f\u76f8\u7576\u51fa\u8272\u7684\u3002\u5b83\u4e0d\u50c5\u9075\u5faa\u4e86\u6700\u65b0\u7684 SQL \u6a19\u6e96\uff0c\u9084\u589e\u5f37\u4e86\u6578\u64da\u985e\u578b\u652f\u6301\u3001\u6027\u80fd\u512a\u5316\u3001\u517c\u5bb9\u6027\u53ca\u5b89\u5168\u6027\u7b49\u591a\u500b\u65b9\u9762\u3002\u9019\u4e9b\u6539\u9032\u4f7f\u5f97 DB2 9.7 \u6210\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u9069\u5408\u5404\u7a2e\u696d\u52d9\u9700\u6c42\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 \u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cDB2 9.7 \u7684\u5f37\u5927\u529f\u80fd\u5c07\u70ba\u60a8\u7684\u6578\u64da\u7ba1\u7406\u63d0\u4f9b\u6709\u529b\u652f\u6301\u3002\u7121\u8ad6\u662f\u6578\u64da\u5eab\u7684\u6027\u80fd\u9084\u662f\u5b89\u5168\u6027\uff0c\u9078\u64c7\u5408\u9069\u7684 \u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u5c07\u662f\u60a8\u6210\u529f\u7684\u95dc\u9375\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22DB2 9.7\u6578\u64da\u5eab\u7684SQL\u517c\u5bb9\u6027\u8868\u73fe\uff0c\u5305\u62ec\u8a9e\u6cd5\u652f\u6301\u3001\u529f\u80fd\u64f4\u5c55\u53ca\u6027\u80fd\u512a\u5316\uff0c\u52a9\u529b\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-60275","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60275","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=60275"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60275\/revisions"}],"predecessor-version":[{"id":60276,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60275\/revisions\/60276"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60275"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60275"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60275"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}