{"id":2333,"date":"2012-11-08T10:02:11","date_gmt":"2012-11-08T10:02:11","guid":{"rendered":"http:\/\/enjoyasp.net\/?p=2333"},"modified":"2014-01-01T18:40:58","modified_gmt":"2014-01-01T18:40:58","slug":"sqlserver2012-tsql%e5%a2%9e%e5%bc%ba","status":"publish","type":"post","link":"https:\/\/enjoyasp.net\/index.php\/2012\/11\/08\/sqlserver2012-tsql%e5%a2%9e%e5%bc%ba\/","title":{"rendered":"sqlserver2012 tsql\u589e\u5f3a"},"content":{"rendered":"
\r\nT-SQL Enhancements\r\n\u53c2\u8003\uff1a\u82f1\u6587<\/a>\uff0c\u4e2d\u6587<\/a>\r\n\r\n1\uff0cWITH RESULT SETS\r\n\u66f4\u6539\u5b58\u50a8\u8fc7\u7a0b\u8fd4\u56de\u7ed3\u679c\u8868\u7684\u5b57\u6bb5\u540d\u7c7b\u578b\r\nCREATE PROCEDURE Denali_WithResultSet  AS  \r\nBEGIN         \r\n    SELECT 1 as No,’Tsql’ Type, ‘WithResultSet’ AS Feature\r\n    UNION ALL  SELECT 2 as No,’Tsql’ Type, ‘Throw’ AS Feature \r\n    UNION ALL SELECT 3 as No,’Tsql’ Type, ‘Offset’ AS Feature \r\n    UNION ALL SELECT 4 as No,’Tsql’ Type, ‘Sequence’ AS Feature  \r\nEND  \r\nGO  \r\nEXEC Denali_WithResultSet  \r\nWITH RESULT SETS  (( No int,FeatureType varchar(50), FeatureName varchar(50) )   )\r\n\r\n2\uff0cOFFSET and FETCH\r\noffset\u8fc7\u6ee4\u51e0\u884c fetch:\u53d6\u4e0b\u9762\u7684\u51e0\u884c\r\nSELECT top 15 * FROM dbo.frmuser f(NOLOCK) order BY account     \r\nSELECT * FROM dbo.frmuser f(NOLOCK) order BY account OFFSET 10 ROWS FETCH NEXT 5 ROWS ONLY   \r\nSELECT top 5 * FROM ( SELECT * ,ROW_NUMBER()OVER (ORDER BY account)n FROM frmuser f)m WHERE m.n>10\r\n\r\n3\uff0cSEQUENCE\r\n\u63d0\u4f9b\u81ea\u589e\u957f\uff0c\u4e0eidentity\u4e0d\u540c\u7684\u662f\u4e0d\u4f9d\u8d56\u4e0e\u8868\uff0c\u5e76\u4e14\u662f\u5168\u5c40\u6027\u7684 \u53ef\u4e0d\u8bbe\u7f6e\u6700\u5927\u503c,\u82e5\u5230\u6700\u5927\u503c\u65f6\u53ef\u81ea\u52a8\u5faa\u73af\u3002\r\nCREATE SEQUENCE SeqRange  AS int   START WITH 1   INCREMENT BY 1     MINVALUE 1      MAXVALUE 5    CYCLE ;\/\/\u5faa\u73af\u81ea\u52a8    \r\nSELECT NEXT VALUE FOR dbo.SeqRange  S\r\nELECT NEXT VALUE FOR dbo.Seq; \r\n SELECT NEXT VALUE FOR dbo.Seq;\r\n\r\n\u5230\u8fbe\u6700\u5927\u503c\u540e\uff0c\u53ef\u91cd\u7f6e\r\nALTER SEQUENCE seq  RESTART WITH 1\r\n\r\n\u8d4b\u503c\uff1a\r\n<\/pre>\n
\n
\r\nDECLARE @I INT<\/pre>\n<\/div>\n
\n\tSELECT @I = NEXT VALUE FOR dbo.SeqRange<\/div>\n
\n\tSELECT @i<\/p>\n
\u67e5\u8be2\u5f53\u524d\u503c<\/p>\n
\n\t\tSELECT cache_size, current_value <\/div>\n
\n\t\tFROM sys.sequences<\/div>\n
\n\t\tWHERE name = 'SeqRange' ;<\/div>\n<\/div>\n
\n\t <\/div>\n
\u76f8\u5173\u5b58\u50a8\u8fc7\u7a0b
\nDECLARE @first_value sql_variant,
\n@last_value sql_variant
\nEXEC sp_sequence_get_range  @sequence_name = N’SeqRange’,  @range_size = 4,  @range_first_value = @first_value OUTPUT,  @range_last_value = @last_value OUTPUT;
\nSELECT @first_value AS FirstNumber,            @last_value as LastNumber<\/p>\n
\u5e94\u7528\uff1a\u8ba2\u5355\u53f7\u751f\u6210
\n\u53ef\u5728\u8868\u5b9a\u4e49\u65f6\u4f7f\u7528\uff0c\u8fd9\u6837\u6211\u4eec\u5c31\u80fd\u5728\u63d2\u5165\u4e4b\u524d\u83b7\u53d6ID
\ncreate table t1 (  orderID integer default (next value for dbo.TestID),  OrderDesc varchar(50)  )<\/p>\n
4\uff0cFORCESEEK and FORCESCAN
\nforceseek:\u5f3a\u5236\u67e5\u8be2\u6309\u67d0\u4e2a\u7d22\u5f15\u67e5\u627e
\nforecescan:\u5f3a\u5236\u67e5\u8be2\u6309\u67e5\u4e2a\u7d22\u5f15\u626b\u63cf<\/p>\n
5\uff0c
\nEOMONTH\uff1a\u8fd4\u56de\u5f53\u6708\u6700\u540e\u4e00\u5929
\nCHOOSE:\u8fd4\u56de\u5217\u8868\u4e2d\u7684\u7b2c\u51e0\u4e2a\u503c
\nSelect Choose (2, 'January', 'February', 'March');
\nIIF:\u4e09\u503c\u903b\u8f91
\nSELECT IIF (@a > @b, 'TRUE', ‘FALSE’) AS Result;
\nCONCAT: \u8fde\u63a5\uff0c\u53ef\u591a\u79cd\u7c7b\u578b\uff0c\u5982\u6574\u578b\u4e0e\u5b57\u7b26\u4e32\u76f8\u52a0
\nSELECT CONCAT ('age:',1) AS Result;<\/p>\n
OVER \u589e\u5f3a
\nunbounded preceding\uff1a\u4ece\u5934\u5f00\u59cb
\nCURRENT ROW\uff1a\u5f53\u524d\u884c
\nunbounded following\uff1a\u5c3e<\/p>\n
\u5982\uff1a
\nSELECT *
\nFROM (
\n SELECT  bc.CustomerName, bo.OrderDate,bo.OrderNo,bo.Amount,
\n last_value(orderdate) OVER( PARTITION BY bc.ID ORDER BY bo.OrderDate RANGE BETWEEN unbounded preceding AND unbounded following  ) lastorderdate
\n FROM  dbo.bmdCustomer bc(NOLOCK)
\n JOIN dbo.bdOrder bo(NOLOCK) ON bc.ID = bo.CustomerID
\n –WHERE bc.id IN(1819,2206,2444)
\n)m
\nWHERE m.orderdate = m.lastorderdate
\nORDER BY CustomerName,OrderDate<\/p>\n
6\uff0c\u5206\u6790\u51fd\u6570
\nlag:\u8fd4\u56de\u6309\u67d0\u79cd\u6392\u5e8f\u76f8\u6bd4\u5f53\u524d\u884c\uff0c\u4e0a\u51e0\u884c\u7684\u5b57\u6bb5 LAG (scalar_expression [, offset], [default]) OVER ([partition_by_clause] order_by_clause)
\nSELECT TOP 10 Account,lag(account,1,'\u5f00\u59cb') OVER( ORDER BY account )
\nFROM  dbo.frmuser
\nORDER BY account<\/p>\n
SELECT TOP 10 Account,lead(account+'aaa',1,'\u5f00\u59cb') OVER( ORDER BY account )
\nleag:\u8fd4\u56de\u6309\u67d0\u79cd\u6392\u5e8f\u76f8\u6bd4\u5f53\u524d\u884c\uff0c\u4e0b\u51e0\u884c\u7684\u5b57\u6bb5
\nLAST_VALUE \u8fd4\u56de SQL Server 2012 \u4e2d\u6709\u5e8f\u503c\u96c6\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u503c,\u8fd9\u4e2a\u96c6\u53ef\u7528range\u6307\u5b9a \u9ed8\u8ba4\u662f\u4ece\u7b2c\u4e00\u884c\u5230\u5f53\u524d\u8fd9\u4e00\u884c:RANGE BETWEEN unbounded preceding AND CURRENT ROW FIRST_VALUE \u5f00\u5934\u4e00\u4e2a\u503c
\n–\u9700\u6c42\uff1a\u53d6\u51fa\u5ba2\u6237\u7684\u6700\u8fd1\u4e00\u6b21\u8d2d\u4e70\u7684\u8ba2\u5355\u53f7\u4e0e\u8ba2\u5355\u91d1\u989d<\/p>\n
SELECT *
\nFROM (
\n SELECT  bc.CustomerName, bo.OrderDate,bo.OrderNo,bo.Amount,
\n last_value(orderdate) OVER( PARTITION BY bc.ID ORDER BY bo.OrderDate RANGE BETWEEN unbounded preceding AND unbounded following  ) lastorderdate
\n FROM  dbo.bmdCustomer bc(NOLOCK)
\n JOIN dbo.bdOrder bo(NOLOCK) ON bc.ID = bo.CustomerID
\n –WHERE bc.id IN(1819,2206,2444)
\n)m
\nWHERE m.orderdate = m.lastorderdate
\nORDER BY CustomerName,OrderDate<\/p>\n
–\u539f\u65b9\u6cd5
\nSELECT  bc.CustomerName, bo.OrderDate,bo.OrderNo,bo.Amount
\nFROM  dbo.bmdCustomer bc(NOLOCK)
\nJOIN dbo.bdOrder bo(NOLOCK) ON bc.ID = bo.CustomerID
\n–WHERE bc.id IN(1819,2206,2444)
\nAND bo.orderdate = ( SELECT MAX(OrderDate)
\n    FROM dbo.bdOrder bo2(NOLOCK)
\n    WHERE bo2.CustomerID = bo.CustomerID)
\nORDER BY CustomerName,OrderDate<\/p>\n","protected":false},"excerpt":{"rendered":"
T-SQL Enhancements \u53c2\u8003\uff1a\u82f1\u6587\uff0c\u4e2d\u6587 1\uff0cWITH RESULT SETS \u66f4\u6539\u5b58\u50a8\u8fc7\u7a0b\u8fd4\u56de […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-2333","post","type-post","status-publish","format-standard","hentry","category-sql-server"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/2333","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/comments?post=2333"}],"version-history":[{"count":0,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/2333\/revisions"}],"wp:attachment":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/media?parent=2333"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/categories?post=2333"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/tags?post=2333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}