{"id":94252,"date":"2024-10-19T18:45:18","date_gmt":"2024-10-19T10:45:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/94252\/"},"modified":"2024-10-19T18:45:19","modified_gmt":"2024-10-19T10:45:19","slug":"oracle-select%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8%e6%96%b9%e6%a1%88%e7%b0%a1%e4%bb%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/94252\/","title":{"rendered":"Oracle SELECT\u7684\u5be6\u969b\u61c9\u7528\u65b9\u6848\u7c21\u4ecb"},"content":{"rendered":"

Oracle SELECT\u7684\u5be6\u969b\u61c9\u7528\u65b9\u6848\u7c21\u4ecb<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cOracle\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff0c\u5176\u5f37\u5927\u7684\u67e5\u8a62\u8a9e\u8a00SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u9ad8\u6548\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6240\u9700\u7684\u4fe1\u606f\u3002\u672c\u6587\u5c07\u4ecb\u7d39Oracle SELECT\u8a9e\u53e5\u7684\u57fa\u672c\u7528\u6cd5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u5e7e\u500b\u65b9\u6848\u3002<\/p>\n

Oracle SELECT\u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb<\/h2>\n

Oracle\u7684SELECT\u8a9e\u53e5\u7528\u65bc\u5f9e\u6578\u64da\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\uff0c\u5176\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0ccolumn1, column2, ...<\/code>\u662f\u8981\u6aa2\u7d22\u7684\u5217\u540d\uff0ctable_name<\/code>\u662f\u6578\u64da\u8868\u7684\u540d\u7a31\uff0c\u800ccondition<\/code>\u5247\u662f\u7528\u65bc\u904e\u6ffe\u6578\u64da\u7684\u689d\u4ef6\u3002<\/p>\n
\u5be6\u969b\u61c9\u7528\u65b9\u6848<\/h2>\n
1. \u6578\u64da\u5206\u6790<\/h3>\n
\u5728\u5546\u696d\u74b0\u5883\u4e2d\uff0c\u6578\u64da\u5206\u6790\u662f\u6c7a\u7b56\u904e\u7a0b\u4e2d\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u4f7f\u7528SELECT\u8a9e\u53e5\uff0c\u4f01\u696d\u53ef\u4ee5\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u95dc\u9375\u6307\u6a19\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u67e5\u8a62\u53ef\u4ee5\u7528\u4f86\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u7e3d\u984d\uff1a<\/p>\n
SELECT product_id, SUM(sales_amount) AS total_sales\nFROM sales\nGROUP BY product_id;<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u5e6b\u52a9\u4f01\u696d\u4e86\u89e3\u54ea\u4e9b\u7522\u54c1\u8868\u73fe\u826f\u597d\uff0c\u5f9e\u800c\u5236\u5b9a\u76f8\u61c9\u7684\u5e02\u5834\u7b56\u7565\u3002<\/p>\n
2. \u5831\u544a\u751f\u6210<\/h3>\n
\u8a31\u591a\u4f01\u696d\u9700\u8981\u5b9a\u671f\u751f\u6210\u5831\u544a\u4ee5\u4fbf\u65bc\u5167\u90e8\u5be9\u6838\u6216\u5916\u90e8\u5408\u898f\u3002\u4f7f\u7528SELECT\u8a9e\u53e5\uff0c\u53ef\u4ee5\u8f15\u9b06\u5730\u5f9e\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u751f\u6210\u6bcf\u6708\u7684\u92b7\u552e\u5831\u544a\uff1a<\/p>\n
SELECT TO_CHAR(sale_date, 'YYYY-MM') AS month, SUM(sales_amount) AS total_sales\nFROM sales\nGROUP BY TO_CHAR(sale_date, 'YYYY-MM')\nORDER BY month;<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u4e0d\u50c5\u80fd\u5920\u63d0\u4f9b\u6e05\u6670\u7684\u6578\u64da\u8996\u5716\uff0c\u9084\u80fd\u5e6b\u52a9\u7ba1\u7406\u5c64\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n
3. \u6578\u64da\u904e\u6ffe\u8207\u6392\u5e8f<\/h3>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u7528\u6236\u53ef\u80fd\u53ea\u9700\u8981\u7279\u5b9a\u689d\u4ef6\u4e0b\u7684\u6578\u64da\u3002SELECT\u8a9e\u53e5\u7684WHERE\u5b50\u53e5\u53ef\u4ee5\u7528\u4f86\u904e\u6ffe\u6578\u64da\uff0c\u800cORDER BY\u5b50\u53e5\u5247\u53ef\u4ee5\u7528\u4f86\u6392\u5e8f\u7d50\u679c\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u6240\u6709\u92b7\u552e\u984d\u8d85\u904e1000\u7684\u7522\u54c1\u4e26\u6309\u92b7\u552e\u984d\u964d\u5e8f\u6392\u5217\uff1a<\/p>\n
SELECT product_id, sales_amount\nFROM sales\nWHERE sales_amount > 1000\nORDER BY sales_amount DESC;<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u627e\u5230\u9ad8\u92b7\u552e\u984d\u7684\u7522\u54c1\uff0c\u5f9e\u800c\u9032\u884c\u9032\u4e00\u6b65\u7684\u5206\u6790\u6216\u6c7a\u7b56\u3002<\/p>\n
4. \u591a\u8868\u806f\u63a5<\/h3>\n
\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6578\u64da\u5f80\u5f80\u5206\u6563\u5728\u591a\u500b\u8868\u4e2d\u3002\u4f7f\u7528JOIN\u8a9e\u53e5\u53ef\u4ee5\u5c07\u9019\u4e9b\u8868\u806f\u63a5\u8d77\u4f86\uff0c\u5f9e\u800c\u7372\u53d6\u66f4\u5168\u9762\u7684\u4fe1\u606f\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u6bcf\u500b\u5ba2\u6236\u7684\u8a02\u55ae\u4fe1\u606f\uff1a<\/p>\n
SELECT c.customer_name, o.order_id, o.order_date\nFROM customers c\nJOIN orders o ON c.customer_id = o.customer_id;<\/code><\/pre>\n
\u9019\u6a23\u7684\u67e5\u8a62\u80fd\u5920\u63d0\u4f9b\u5ba2\u6236\u8207\u8a02\u55ae\u4e4b\u9593\u7684\u95dc\u806f\uff0c\u5e6b\u52a9\u4f01\u696d\u66f4\u597d\u5730\u7406\u89e3\u5ba2\u6236\u9700\u6c42\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
Oracle\u7684SELECT\u8a9e\u53e5\u5728\u6578\u64da\u6aa2\u7d22\u548c\u5206\u6790\u4e2d\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002\u7121\u8ad6\u662f\u6578\u64da\u5206\u6790\u3001\u5831\u544a\u751f\u6210\u3001\u6578\u64da\u904e\u6ffe\u8207\u6392\u5e8f\uff0c\u9084\u662f\u591a\u8868\u806f\u63a5\uff0cSELECT\u8a9e\u53e5\u90fd\u80fd\u5920\u63d0\u4f9b\u9748\u6d3b\u4e14\u5f37\u5927\u7684\u89e3\u6c7a\u65b9\u6848\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u82e5\u60a8\u5c0d\u65bc\u9999\u6e2fVPS<\/a><\/code>\u6216\u9999\u6e2f\u4f3a\u670d\u5668<\/a><\/code>\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22Oracle SELECT\u7684\u5be6\u969b\u61c9\u7528\u65b9\u6848\uff0c\u4e86\u89e3\u5982\u4f55\u9ad8\u6548\u67e5\u8a62\u6578\u64da\u4e26\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-94252","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94252","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=94252"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94252\/revisions"}],"predecessor-version":[{"id":94253,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/94252\/revisions\/94253"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=94252"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=94252"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=94252"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}