ExampleGet your own SQL Server Convert a value to an int datatype: SELECTCAST(25.65ASint); Try it Yourself » Definition and Usage The CAST() function converts a value (of any type) into a specified datatype. Tip:Also look at theCONVERT()function. ...
select CAST('00001' AS SIGNED INTEGER) AS int_col; 1. 2. 2.将字符转换为日期类型 select cast('2018-11-12' AS DATE) AS sate_col; 1. 3.COALESC()E——将null转换为其他值 COALESCE(参数1,参数2,参数3...)参数个数时可变的,可以无限个。 --SQL Server, PostgreSQL, MySQL SELECT COALESCE(...
如果试图进行不可能的转换(例如,将含有字母的 char 表达式转换为 int 类型),SQServer 将显示一条错误信息。 如果转换时没有指定数据类型的长度,则SQServer自动提供长度为30。 二、注意事项: (1).CAST()函数的参数是一个表达式,它包括用AS关键字分隔的源值和目标数据类型。以下例子用于将文本字符串'12'转换为整...
被SQL Server 认为可折叠的内置函数,包括 CAST 和CONVERT。 通常,如果内部函数只与输入有关而与其他上下文信息(例如 SET 选项、语言设置、数据库选项和加密密钥)无关,则该内部函数是可折叠的。 不确定性函数是不可折叠的。 确定性内置函数是可折叠的,但也有例外情况。 CLR 用户定义类型的确定性方法和确定性标量...
一.FUNCTION: 在sqlserver2008中有3中自定义函数:标量函数/内联表值函数/多语句表值函数,首先总结下他们语法的异同点: 同点:1.创建定义是一样的: a, CREATE FUNCTION F_NAME(传入的参数名称 传入参数的类型) b,RETURNS 返回值类型 c,AS 异点:1.标量函数返回的是一个数据类型值,内联表值函数返回的是一个...
语法:ROUND(numeric_expression, length[, function]) 描述:返回一个数值,舍入到指定的长度或精度。 示例:SELECTROUND(12, 2) AS Column1, CAST(ROUND(12, 2) AS numeric(19,2)) AS Column2, ROUND(12.2346, 2) AS Column3, ROUND(12.2356, 2) AS Column4, ROUND(12.2354, 2) AS Column5, ROUND(...
FunctionDescription CAST Converts a value (of any type) into a specified datatype COALESCE Returns the first non-null value in a list CONVERT Converts a value (of any type) into a specified datatype CURRENT_USER Returns the name of the current user in the SQL Server database IIF Returns...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance Creates a user-defined function (UDF), which is a Transact-SQL or common language runtime (CLR) routine. A user-defined function accepts parameters, performs an action such as a complex calculation, and returns the result of ...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance Creates a user-defined function (UDF), which is a Transact-SQL or common language runtime (CLR) routine. A user-defined function accepts parameters, performs an action such as a complex calculation, and returns the result of ...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance Creates a user-defined function (UDF), which is a Transact-SQL or common language runtime (CLR) routine. A user-defined function accepts parameters, performs an action such as a complex calculation, and returns the result of ...