function_body:指定一系列定义函数值的Transact-SQL语句。function_body 仅用于标量函数和多语句表值函数。 RETURN scalar_expression:指定标量函数返回的标量值。 注意:函数定义必须是批处理的第一个语句,可以使用GO定义批处理即可 实例: CREATEFUNCTIONGetStuNameById(@stuidINT)RETURNSVARCHAR(30)ASBEGINDECLARE@stuName...
function_name:用户定义函数名,函数名必须符合标示符规范,对其所有者来说,该用户名在数据库中必须是唯一的。 @parameter_name:用户定义函数的形参名, create function 语句中可以申明一个或多个参数,用@符号作为第一个字符来指定形参名 ,每个函数的参数局部作用于该函数。 scalar_parameter_data_type:参数的数据类型...
SQL Server Usage String functions are typically scalar functions that perform an operation on string input and return a string or a numeric value. Syntax and Examples The following table includes the most commonly used string functions. FunctionPurposeExampleResul...
RightFunctionCall RolePayloadOption RoleStatement RollbackTransactionStatement RollupGroupingSpecification RouteOption RouteOptionKind RouteStatement RowValue SaveTransactionStatement SkalarExpression ScalarExpressionDialogOption ScalarExpressionRestoreOption ScalarExpressionSequenceOption ScalarExpressionSnippet ScalarFunctionReturn...
SelectFunctionReturnType SelectInsertSource SelectiveXmlIndexPromotedPath SelectScalarExpression SelectSetVariable SelectStarExpression SelectStatement SelectStatementSnippet SemanticFunctionType SemanticTableReference SendStatement SensitivityClassification SensitivityClassification.OptionType SensitivityClassification.Ra...
GREATESTandLEASTare scalar-valued functions and return the maximum and minimum value, respectively, of a list of one or more expressions. The syntax is as follows: GREATEST(expression1[,...expressionN])LEAST(expression1[,...expressionN]) ...
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Learn the basics of the In-Memory OLTP performance features of SQL Server and Azure SQL Database with quick explanations and core code samples for developers.
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T-SQL 函数概述 T-SQL函数的类别和描述: 函数的目标是返回一个值。大多数函数都返回一个标量值(scalar value),标量值代表一个数据单元或一个简.单值。实际上,函数可以返回任何数据类型,包括表、游标等可返回完整的多行结果集的类型。 在T-SQL中,一般用SELECT语句来返回值。如果需要从查询中返回一个值,就可以...