{"id":137541,"date":"2024-10-31T12:32:23","date_gmt":"2024-10-31T04:32:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/137541\/"},"modified":"2024-10-31T12:32:24","modified_gmt":"2024-10-31T04:32:24","slug":"sql-server-sql%e8%aa%9e%e5%8f%a5%e7%9a%84n%e5%a4%9a%e8%aa%aa%e6%98%8e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/137541\/","title":{"rendered":"SQL Server sql\u8a9e\u53e5\u7684N\u591a\u8aaa\u660e"},"content":{"rendered":"

SQL Server sql\u8a9e\u53e5\u7684N\u591a\u8aaa\u660e<\/h1>\n

\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cSQL Server\u4f5c\u70ba\u4e00\u7a2e\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u696d\u52d9\u74b0\u5883\u4e2d\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207SQL Server\u9032\u884c\u4ea4\u4e92\u7684\u4e3b\u8981\u8a9e\u8a00\uff0c\u80fd\u5920\u57f7\u884c\u6578\u64da\u67e5\u8a62\u3001\u66f4\u65b0\u3001\u63d2\u5165\u548c\u522a\u9664\u7b49\u64cd\u4f5c\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSQL Server\u4e2d\u7684\u4e00\u4e9b\u57fa\u672c\u548c\u9032\u968e\u7684SQL\u8a9e\u53e5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u4e00\u5f37\u5927\u7684\u5de5\u5177\u3002<\/p>\n

\u57fa\u672cSQL\u8a9e\u53e5<\/h2>\n

1. SELECT\u8a9e\u53e5<\/h3>\n

SELECT\u8a9e\u53e5\u662fSQL\u4e2d\u6700\u5e38\u7528\u7684\u8a9e\u53e5\u4e4b\u4e00\uff0c\u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

SELECT column1, column2 FROM table_name;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u540d\u70ba\u201cCustomers\u201d\u7684\u8868\u4e2d\u9078\u64c7\u201cCustomerName\u201d\u548c\u201cCity\u201d\u5169\u500b\u6b04\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n
SELECT CustomerName, City FROM Customers;<\/code><\/pre>\n
2. WHERE\u5b50\u53e5<\/h3>\n
WHERE\u5b50\u53e5\u7528\u65bc\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\uff0c\u50c5\u8fd4\u56de\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u8a18\u9304\u3002\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u4f86\u81ea\u201cLondon\u201d\u7684\u5ba2\u6236\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT CustomerName FROM Customers WHERE City = 'London';<\/code><\/pre>\n
3. INSERT INTO\u8a9e\u53e5<\/h3>\n
INSERT INTO\u8a9e\u53e5\u7528\u65bc\u5411\u8868\u4e2d\u63d2\u5165\u65b0\u8a18\u9304\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
INSERT INTO table_name (column1, column2) VALUES (value1, value2);<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5411\u201cCustomers\u201d\u8868\u4e2d\u63d2\u5165\u4e00\u689d\u65b0\u8a18\u9304\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
INSERT INTO Customers (CustomerName, City) VALUES ('John Doe', 'New York');<\/code><\/pre>\n
4. UPDATE\u8a9e\u53e5<\/h3>\n
UPDATE\u8a9e\u53e5\u7528\u65bc\u4fee\u6539\u5df2\u5b58\u5728\u7684\u8a18\u9304\u3002\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
UPDATE table_name SET column1 = value1 WHERE condition;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5c07\u201cJohn Doe\u201d\u7684\u57ce\u5e02\u66f4\u65b0\u70ba\u201cLos Angeles\u201d\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
UPDATE Customers SET City = 'Los Angeles' WHERE CustomerName = 'John Doe';<\/code><\/pre>\n
5. DELETE\u8a9e\u53e5<\/h3>\n
DELETE\u8a9e\u53e5\u7528\u65bc\u522a\u9664\u8868\u4e2d\u7684\u8a18\u9304\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
DELETE FROM table_name WHERE condition;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664\u4f86\u81ea\u201cNew York\u201d\u7684\u5ba2\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
DELETE FROM Customers WHERE City = 'New York';<\/code><\/pre>\n
\u9032\u968eSQL\u8a9e\u53e5<\/h2>\n
1. JOIN\u64cd\u4f5c<\/h3>\n
JOIN\u64cd\u4f5c\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u6700\u5e38\u898b\u7684JOIN\u985e\u578b\u5305\u62ecINNER JOIN\u3001LEFT JOIN\u548cRIGHT JOIN\u3002\u4ee5\u4e0b\u662fINNER JOIN\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n
SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u201cCustomers\u201d\u548c\u201cOrders\u201d\u8868\u4e2d\u6aa2\u7d22\u5ba2\u6236\u53ca\u5176\u8a02\u55ae\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT Customers.CustomerName, Orders.OrderID \nFROM Customers \nINNER JOIN Orders ON Customers.CustomerID = Orders.CustomerID;<\/code><\/pre>\n
2. GROUP BY\u548cHAVING\u5b50\u53e5<\/h3>\n
GROUP BY\u5b50\u53e5\u7528\u65bc\u5c07\u7d50\u679c\u96c6\u6309\u4e00\u500b\u6216\u591a\u500b\u5217\u9032\u884c\u5206\u7d44\uff0c\u800cHAVING\u5b50\u53e5\u5247\u7528\u65bc\u904e\u6ffe\u5206\u7d44\u5f8c\u7684\u7d50\u679c\u3002\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
SELECT column, COUNT(*) FROM table_name GROUP BY column HAVING COUNT(*) > value;<\/code><\/pre>\n
\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6bcf\u500b\u57ce\u5e02\u7684\u5ba2\u6236\u6578\u91cf\uff0c\u4e26\u50c5\u986f\u793a\u5ba2\u6236\u6578\u91cf\u5927\u65bc1\u7684\u57ce\u5e02\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n
SELECT City, COUNT(*) \nFROM Customers \nGROUP BY City \nHAVING COUNT(*) > 1;<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
SQL Server\u7684sql\u8a9e\u53e5\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u6578\u64da\u64cd\u4f5c\u80fd\u529b\uff0c\u7121\u8ad6\u662f\u57fa\u672c\u7684\u67e5\u8a62\u9084\u662f\u9032\u968e\u7684\u6578\u64da\u5206\u6790\uff0c\u5747\u80fd\u5920\u6eff\u8db3\u4e0d\u540c\u7684\u9700\u6c42\u3002\u638c\u63e1\u9019\u4e9b\u8a9e\u53e5\u4e0d\u50c5\u80fd\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e\u6211\u5011\u7684\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u70ba\u60a8\u7684\u6578\u64da\u7ba1\u7406\u63d0\u4f9b\u7a69\u5b9a\u7684\u57fa\u790e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22SQL Server\u4e2d\u5404\u7a2eSQL\u8a9e\u53e5\u7684\u8a73\u7d30\u8aaa\u660e\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u638c\u63e1\u6578\u64da\u5eab\u67e5\u8a62\u8207\u7ba1\u7406\u6280\u5de7\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-137541","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137541","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=137541"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137541\/revisions"}],"predecessor-version":[{"id":137542,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/137541\/revisions\/137542"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=137541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=137541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=137541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}