MS SQL Server的COALESCE函数是从一系列表达式中返回第一个NOT NULL的值。 检查[B],[Q],[S],[T],[U]的值: 检查顺序[B]->[Q]->[S]->[T]->[U],只要一遇上NOT NULL时,即刻返回。 Source Code 再列一个例子: Source Code
oalesce 获得参数中第一个不为空的表达式。 语法: COALESCE ( expression [ ,...n ] ) 例子: CREATE TABLE wages /*创建表wages*/ ( emp_id tinyint identity, hourly_wage decimal NULL, salary decimal NULL, commission decimal NULL, num_sales tinyint NULL ) GO INSERT wages VALUES(10.00, NULL, ...
MS SQL Server的COALESCE函数是从一系列表达式中返回第一个NOT NULL的值。 检查[B],[Q],[S],[T],[U]的值: 检查顺序[B]->[Q]->[S]->[T]->[U],只要一遇上NOT NULL时,即刻返回。 IFOBJECT_ID('tempdb.dbo.#Part_summary')ISNOTNULLDROPTABLE#Part_summaryCREATETABLE#Part_summary ([Item]NVARCH...
SQL 复制 SET NOCOUNT ON; GO USE tempdb; IF OBJECT_ID('dbo.wages') IS NOT NULL DROP TABLE wages; GO CREATE TABLE dbo.wages ( emp_id TINYINT IDENTITY, hourly_wage DECIMAL NULL, salary DECIMAL NULL, commission DECIMAL NULL, num_sales TINYINT NULL ); GO INSERT dbo.wages (hourly_wage...
SQL Copiar SET NOCOUNT ON; GO USE tempdb; IF OBJECT_ID('dbo.wages') IS NOT NULL DROP TABLE wages; GO CREATE TABLE dbo.wages ( emp_id TINYINT IDENTITY, hourly_wage DECIMAL NULL, salary DECIMAL NULL, commission DECIMAL NULL, num_sales TINYINT NULL ); GO INSERT dbo.wages (hourly_...
sql server COALESCE sql server coalesce函数 序言 SELECT datediff(ms, '2019-07-18 14:01:50.867', '2019-07-18 14:01:52.877') 1. coalesce函数(下面简称函数),返回一个参数中非空的值 SELECT COALESCE(NULL, NULL, GETDATE()) 1. 由于两个参数都为null,所以返回getdate()函数的值,也就是当前时间...
Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed InstanceAzure Synapse AnalyticsAnalytics Platform System (PDW)SQL analytics endpoint in Microsoft FabricWarehouse in Microsoft FabricSQL database in Microsoft Fabric Evaluates the arguments in order and returns the current value of the first express...
(Inherited from TSqlFragment) FragmentLength Defines the number of characters the fragment takes up in the script it was parsed. (Inherited from TSqlFragment) LastTokenIndex Gets or sets the last index of the token. (Inherited from TSqlFragment) ScriptTokenStream Gets...
SQL Server Compact Technical Reference SQL Reference (SQL Server Compact) Save Add to Collections Add to Plan Share via Facebookx.comLinkedInEmail Print Article 09/28/2009 In this article Syntax Arguments Return Value Example Returns the first nonnull expression among its arguments. ...
(Inherited from TSqlFragment) FragmentLength Defines the number of characters the fragment takes up in the script it was parsed. (Inherited from TSqlFragment) LastTokenIndex Gets or sets the last index of the token. (Inherited from TSqlFragment) ScriptTokenStream Gets or sets the scri...