\u5728 SQL \u4e2d\uff0c\u8b8a\u91cf\u7684\u4f7f\u7528\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u67e5\u8a62\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002\u7279\u5225\u662f\u5728\u5b58\u5132\u904e\u7a0b\u548c\u51fd\u6578\u4e2d\uff0c\u6307\u793a\u8b8a\u91cf\u548c\u6578\u7d44\u8b8a\u91cf\u7684\u61c9\u7528\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u9019\u5169\u7a2e\u8b8a\u91cf\u7684\u6982\u5ff5\u3001\u7528\u6cd5\u53ca\u5176\u5728 SQL \u4e2d\u7684\u5be6\u969b\u61c9\u7528\u3002<\/p>\n
\u6307\u793a\u8b8a\u91cf\uff08\u4e5f\u7a31\u70ba\u6a19\u91cf\u8b8a\u91cf\uff09\u662f\u7528\u4f86\u5b58\u5132\u55ae\u4e00\u503c\u7684\u8b8a\u91cf\u3002\u5728 SQL \u4e2d\uff0c\u9019\u4e9b\u8b8a\u91cf\u901a\u5e38\u7528\u65bc\u5b58\u5132\u67e5\u8a62\u7d50\u679c\u3001\u8a08\u7b97\u7d50\u679c\u6216\u7528\u65bc\u63a7\u5236\u6d41\u7a0b\u7684\u689d\u4ef6\u3002\u6307\u793a\u8b8a\u91cf\u7684\u5b9a\u7fa9\u901a\u5e38\u5305\u62ec\u8b8a\u91cf\u7684\u540d\u7a31\u3001\u6578\u64da\u985e\u578b\u53ca\u5176\u521d\u59cb\u503c\u3002<\/p>\n
DECLARE @myVariable INT; -- \u5b9a\u7fa9\u4e00\u500b\u6574\u6578\u578b\u7684\u6307\u793a\u8b8a\u91cf\nSET @myVariable = 10; -- \u8a2d\u7f6e\u8b8a\u91cf\u7684\u503c\n<\/code><\/pre>\n\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u540d\u70ba @myVariable<\/code> \u7684\u6574\u6578\u578b\u8b8a\u91cf\uff0c\u4e26\u5c07\u5176\u503c\u8a2d\u7f6e\u70ba 10\u3002\u6307\u793a\u8b8a\u91cf\u53ef\u4ee5\u5728 SQL \u67e5\u8a62\u4e2d\u591a\u6b21\u4f7f\u7528\uff0c\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u91cd\u8907\u8a08\u7b97\uff0c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n\u6307\u793a\u8b8a\u91cf\u7684\u61c9\u7528\u793a\u4f8b<\/h3>\n
\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u6307\u793a\u8b8a\u91cf\u7684\u7c21\u55ae\u793a\u4f8b\uff0c\u8a72\u793a\u4f8b\u8a08\u7b97\u67d0\u500b\u7522\u54c1\u7684\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n
DECLARE @totalSales DECIMAL(10, 2);\nSELECT @totalSales = SUM(price) FROM Sales WHERE product_id = 1;\nPRINT 'Total Sales: ' + CAST(@totalSales AS VARCHAR);\n<\/code><\/pre>\n\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u9996\u5148\u5b9a\u7fa9\u4e86\u4e00\u500b\u540d\u70ba @totalSales<\/code> \u7684\u8b8a\u91cf\uff0c\u7136\u5f8c\u901a\u904e\u67e5\u8a62\u8a08\u7b97\u51fa\u7522\u54c1 ID \u70ba 1 \u7684\u7e3d\u92b7\u552e\u984d\uff0c\u6700\u5f8c\u5c07\u7d50\u679c\u6253\u5370\u51fa\u4f86\u3002<\/p>\n\u6578\u7d44\u8b8a\u91cf<\/h2>\n
\u6578\u7d44\u8b8a\u91cf\u5728 SQL \u4e2d\u7684\u4f7f\u7528\u76f8\u5c0d\u8f03\u5c11\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u5b83\u5011\u53ef\u4ee5\u63d0\u4f9b\u66f4\u9ad8\u7684\u9748\u6d3b\u6027\u3002\u6578\u7d44\u8b8a\u91cf\u5141\u8a31\u5b58\u5132\u591a\u500b\u503c\uff0c\u9019\u5c0d\u65bc\u9700\u8981\u8655\u7406\u591a\u500b\u6578\u64da\u9805\u7684\u60c5\u6cc1\u975e\u5e38\u6709\u7528\u3002<\/p>\n
\u6578\u7d44\u8b8a\u91cf\u7684\u5b9a\u7fa9\u8207\u4f7f\u7528<\/h3>\n
\u5728 SQL Server \u4e2d\uff0c\u6578\u7d44\u8b8a\u91cf\u901a\u5e38\u662f\u901a\u904e\u8868\u8b8a\u91cf\u6216\u81e8\u6642\u8868\u4f86\u5be6\u73fe\u7684\u3002\u4ee5\u4e0b\u662f\u5b9a\u7fa9\u548c\u4f7f\u7528\u8868\u8b8a\u91cf\u7684\u793a\u4f8b\uff1a<\/p>\n
DECLARE @myArray TABLE (id INT, name VARCHAR(50));\nINSERT INTO @myArray VALUES (1, 'Product A'), (2, 'Product B');\n\nSELECT * FROM @myArray;\n<\/code><\/pre>\n\u5728\u9019\u500b\u793a\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u540d\u70ba @myArray<\/code> \u7684\u8868\u8b8a\u91cf\uff0c\u4e26\u63d2\u5165\u4e86\u5169\u689d\u8a18\u9304\u3002\u7136\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u901a\u904e\u67e5\u8a62\u4f86\u6aa2\u7d22\u9019\u4e9b\u6578\u64da\u3002<\/p>\n\u6578\u7d44\u8b8a\u91cf\u7684\u61c9\u7528\u793a\u4f8b<\/h3>\n
\u6578\u7d44\u8b8a\u91cf\u7279\u5225\u9069\u5408\u7528\u65bc\u9700\u8981\u6279\u91cf\u8655\u7406\u6578\u64da\u7684\u60c5\u6cc1\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528\u8868\u8b8a\u91cf\u4f86\u8a08\u7b97\u591a\u500b\u7522\u54c1\u7684\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n
DECLARE @salesData TABLE (product_id INT, price DECIMAL(10, 2));\nINSERT INTO @salesData VALUES (1, 100.00), (2, 150.00), (1, 200.00);\n\nSELECT product_id, SUM(price) AS totalSales\nFROM @salesData\nGROUP BY product_id;\n<\/code><\/pre>\n\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u8868\u8b8a\u91cf @salesData<\/code> \u5b58\u5132\u591a\u500b\u7522\u54c1\u7684\u92b7\u552e\u6578\u64da\uff0c\u7136\u5f8c\u901a\u904e\u5206\u7d44\u67e5\u8a62\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u7e3d\u92b7\u552e\u984d\u3002<\/p>\n\u7e3d\u7d50<\/h2>\n
\u6307\u793a\u8b8a\u91cf\u548c\u6578\u7d44\u8b8a\u91cf\u5728 SQL \u4e2d\u7684\u4f7f\u7528\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\u3002\u6307\u793a\u8b8a\u91cf\u9069\u5408\u7528\u65bc\u5b58\u5132\u55ae\u4e00\u503c\uff0c\u800c\u6578\u7d44\u8b8a\u91cf\u5247\u9069\u5408\u8655\u7406\u591a\u500b\u6578\u64da\u9805\u3002\u4e86\u89e3\u9019\u4e9b\u8b8a\u91cf\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u6709\u6548\u5730\u7de8\u5beb SQL \u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u5347\u6578\u64da\u8655\u7406\u7684\u6548\u7387\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc \u9999\u6e2fVPS<\/a> \u670d\u52d9\u6709\u8208\u8da3\uff0c\u6216\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc \u4e91\u670d\u52a1\u5668<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u8cc7\u6599\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u63a2\u7d22 SQL \u4e2d\u7684\u6307\u793a\u8b8a\u91cf\u548c\u6578\u7d44\u8b8a\u91cf\uff0c\u4e86\u89e3\u5176\u5b9a\u7fa9\u3001\u7528\u6cd5\u53ca\u5728\u6578\u64da\u8655\u7406\u4e2d\u7684\u61c9\u7528\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-144089","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144089","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=144089"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144089\/revisions"}],"predecessor-version":[{"id":144090,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144089\/revisions\/144090"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}