Syntax for Transact-SQL multi-statement table-valued functions. syntaxsql 复制 CREATE [ OR ALTER ] FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ NULL ] [ = default ] [ READONLY ] } [ , ...n ] ] ) RETURNS...
内嵌TVF(Table-valued Functions) 是支持输入参数的可重复使用的表表达式。除了支持输入参数之外,其他方面基本与视图类似。可以看作是参数化视图 语法: --创建TVFCREATEFUNCTIONdbo.GetCustOrders (@cidASINT)RETURNSTABLEASRETURNSELECT*FROMSales.OrdersWHEREcustid=@cid--使用SELECTc.*FROMdbo.GetCustOrders(1)ASc 5.5...
Chapter 5 Table Expressions 一个表表达式(table expression)是一个命名的查询表达式,代表一个有效的关系表。SQL Server包括4种表表达式:派生表(derived tables)、公用表表达式(common table expressions (CTEs),)、视图(views)、内联表值函数(inline table-valued functions (inline TVFs))。使用表表达式的好处通常在...
Multistatement Table-valued Functions CREATE FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] [ type_schema_name. ] parameter_data_type [ = default ] } [ ,...n ] ] ) RETURNS @return_variable TABLE < table_type_definition > [ WITH <function_option> [ ,...n...
editions of SQL Server. On SQL Server Standard edition, you must use theNOEXPANDquery hint to query the indexed view directly. Azure SQL Database and Azure SQL Managed Instance support automatic use of indexed views without specifying theNOEXPANDhint. For more information, seeTable Hints (Transact...
editions of SQL Server. On SQL Server Standard edition, you must use theNOEXPANDquery hint to query the indexed view directly. Azure SQL Database and Azure SQL Managed Instance support automatic use of indexed views without specifying theNOEXPANDhint. For more information, seeTable Hints (Transact...
AlterServerRoleStatement AlterServiceMasterKeyOption AlterServiceMasterKeyStatement AlterServiceStatement AlterSymmetricKeyStatement AlterTableAddTableElementStatement AlterTableAlterColumnOption AlterTableAlterColumnStatement AlterTableAlterIndexStatement AlterTableAlterPartitionStatement AlterTableChangeTrackingModificationStatem...
Interleaved execution Multi-statement table valued functions have traditionally been treated as a black box by query processing. SQL Server 2017 can better estimate row counts to improve downstream operations. You can make workloads automatically eligible for adaptive query processing by...
Multi-statement table-valued functions (TVFs) don't have interleaved executionInterleaved execution for multi-statement TVFs to improve plan quality. Fixes that were under trace flag 4199 in earlier versions of SQL Server prior to SQL Server 2017 are now enabled by default. With compatibility mode...
Common table expressions (CTEs) allow you to write named table expressions that persist for only the duration of a query. In their simple form, they provide a mixed functionality of views and derived tables. Like views, the CTE can be referred to more than once in the outer query, and li...