Scalar function examples Table-valued function examples Show 2 more Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) This article describes how to create a user-defined function (UDF) in SQL Server by using Transact-SQL....
Only a constant value, such as a character string; a scalar function (either a system, user-defined, or CLR function); or NULL can be used as a default. To maintain compatibility with earlier versions of SQL Server, a constraint name can be assigned to a DEFAULT. constant_expression A ...
user-defined function accepts parameters, performs an action such as a complex calculation, and returns the result of that action as a value. The return value can either be a scalar (single) value or a table. Use this statement to create a reusable routine that can be used in these ways...
Only a constant value, such as a character string; a scalar function (either a system, user-defined, or CLR function); or NULL can be used as a default. To maintain compatibility with earlier versions of SQL Server, a constraint name can be assigned to a DEFAULT. constant_expression A ...
-- Transact-SQL Scalar Function Syntax (in dedicated pools in Azure Synapse Analytics and Parallel Data Warehouse) -- Not available in the serverless SQL pools in Azure Synapse Analytics or Microsoft Fabric CREATE FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ] parameter...
Because the scalar function must be applied to every row, the resulting behavior is like row-based processing and degrades performance. Avoid the use of SELECT *. Instead, specify the required column names. This can prevent some Database Engine errors that stop procedure execution. For example,...
Transact-SQL 語法慣例 語法 --Transact-SQL Scalar Function Syntax CREATE FUNCTION [ schema_name. ] function_name ( [ { @parameter_name [ AS ][ type_schema_name. ] parameter_data_type [ = default ] [ READONLY ] } [ ,...n ]
A scalar function returns a single value each time it is invoked, and is generally valid wherever an SQL expression is valid. A table function can be used in a FROM clause and returns a table. A row function can be used as a transform function and returns a row. Invocation This statemen...
在Transact-SQL 语句中,例如SELECT 在调用该函数的应用程序中 在另一个用户定义函数的定义中 用于为列定义 CHECK 约束 用于替换存储过程 使用内联函数作为安全策略的筛选器谓词 Transact-SQL 语法约定 语法 标量函数语法 syntaxsql -- Transact-SQL Scalar Function Syntax (in dedicated pools in Azure Synapse Analy...
The CREATE FUNCTION (SQL table) statement creates an SQL table function at the current server. The function returns a set of rows. Invocation for CREATE FUNCTION (SQL table) This statement can only be dynamically prepared only if dynamic rules run behavior is in effect. For more information, ...