当然,以下是关于SQL中SELECT CASE语句的详细文档。 SQL SELECT CASE 语句 概述 在SQL查询中,CASE语句用于根据某些条件返回不同的结果。它类似于编程语言中的if-else逻辑结构。CASE语句可以在SELECT、UPDATE、DELETE和SET等子句中使用,但最常见的用法是在SELECT子句中进行条件判断。 语法 简单CASE表达式 CASE input_expre...
6: insert into @table select S.empid,S.empname,T.deptname,S.salary from Employees s inner join Departments T ON S.deptid =T.deptid 7: SELECT COUNT (empid) ,Department,Salary FROM @table GROUP BY Department,Salary HAVING Salary>2000 8: end 使用临时表: 1: Create procedure Performance_Iss...
There are times where you need to write a single TSQL statement that is able to return different TSQL expressions based on the evaluation of another expression. When you need this kind of functionality you can use the CASE expression or IIF function to meet this requirement. In this article I...
CETAS can also export, in parallel, the results of a T-SQL SELECT statement into the created external table. Replication Snapshot and Bi-directional replication types are supported. Merge replication, Peer-to-peer replication, and updatable subscriptions aren't supported. Transactional replication i...
Each time the Cursor loops (and this includes While loops), each SELECT statement is executed independently and receives its own execution plan. If the query is parameterized, then execution plans can be reused. You can see this by using Extended Events, or Profiler. Note: If you try this ...
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CaseExpression CastCall CatalogCollation CatalogCollationOption CellsPerObjectSpatialIndexOption CertificateCreateLoginSource CertificateOption CertificateOptionKinds CertificateStatementBase ChangeRetentionChangeTrackingOptionDetail ChangeTableChangesTableReference ChangeTableVersionTableReference ChangeTrackingDatabaseOption Ch...
Parses an input string to get a statement list. This will return null, if there were any errors.
ORDER BY CASE WHEN NationalIDNumber > 100000000 THEN 0 ELSE 1 END ASC ; -- OR -- ORDER BY 1 ASC ; SELECT @EmpIDVariable ; Imho a problem of the optimizer. Seems that ORDER BY works on columns in the table, but not on expressions. So it's in the end only a cursor o...