WHERE [NOT] EXISTS (subquery) 在某些 Transact-SQL 语句中,子查询可以作为独立查询来计算。 从概念上说,子查询结果会代入外部查询(尽管这不一定是 SQL Server 实际处理带有子查询的 Transact-SQL 语句的方式)。 有三种基本的子查询。 它们是: 在通过IN或由ANY或ALL修改的比较运算符引入的列表上操作。
下列範例顯示可傳回相同結果集和執行計畫的子查詢SELECT及聯結SELECT: SQL USEAdventureWorks2022; GO/* SELECT statement built using a subquery. */SELECT[Name]FROMProduction.ProductWHEREListPrice = (SELECTListPriceFROMProduction.ProductWHERE[Name] ='Chainring Bolts'); GO/* SELECT statement built using a...
代码:select_statement UNION [ALL] selectstatement [UNION [ALL] selectstatement][…n]其中selectstatement为待联合的SELECT查询语句。 ALL选项表示将所有行合并到结果集合中。不指定该项时,被联合查询结果集合中的重复行将只保留一行。 联合查询时,查询结果的列标题为第一个查询语句的列标题。因此,要定义列标题必须...
/* SELECT statement built using a subquery. */ SELECT Name FROM AdventureWorks2008R2.Production.Product WHERE ListPrice = (SELECT ListPrice FROM AdventureWorks2008R2.Production.Product WHERE Name = 'Chainring Bolts' ); /* SELECT statement built using a join that returns the same result set. */...
Select statement union | union all Select statement; 1.2.intersect交集操作 相交运算 用相交运算返回多个查询中所有的公共行。 无重复行。 原则 ?在查询中被 SELECT 语句选择的列数和数据类型必须与在查询中所使用的所有的 SELTCT 语句中的一样,但列的名字不必一样。
I am trying to write a query with a subquery. The subquery returns what is in the attached image below. select top(1) with ties matter_uno, PART_CAT_CODE, EFF_DATE, EMPL_UNO from TBM_CLMAT_PART where MATTER_UNO = 11275 and PART_CAT_CODE = 'BILL' order…
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed InstanceSQL analytics endpoint in Microsoft FabricWarehouse in Microsoft FabricSQL database in Microsoft Fabric Query hints specify that the indicated hints are used in the scope...
SQL Server Azure SQL Database Azure SQL Managed Instance SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Query hints specify that the indicated hints are used in the scope of a query. They affect all operators in the statement. IfUNIONis...
AlterResourceGovernorStatement AlterResourcePoolStatement AlterRoleAction AlterRoleStatement AlterRouteStatement AlterSchemaStatement AlterSearchPropertyListStatement AlterSecurityPolicyStatement AlterSequenceStatement AlterServerAuditSpecificationStatement AlterServerAuditStatement AlterServerConfigurationBufferPoolExtensionContain...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Query hints specify that the indicated hints are used in the scope of a query. They affect all operators in the statement...