The SQL Server ISNULL function returns the replacement value if the first parameterexpressionevaluates to NULL. SQL Server converts the data type of replacement to data type of expression. Let’s explore SQL ISNULL with examples. 如果第一个参数表达式的计算结果为NULL,则SQL Server ISNULL函数将返回...
ISNULL(): 如果声明的表达式为NULL,则SQL Server中的此函数用于返回给定的值。而且,如果给定的表达式不为NULL,则返回指定的表达式。 特征: 如果给定的表达式为NULL,则此函数用于查找给定的值。 如果给定的表达式不为NULL,则此函数用于查找给定的表达式。 此函数位于“高级函数”下。 该函数接受两个参数,即表达式和...
Nothing different from the same expression in SQL Server, let’s see how the COALESCE() function behaves in Oracle regarding the result data type (yes in Oracle it is a function and not an expression like in SQL Server). Let’s try the same examples we did in SQL Server. SELECT coalesc...
Examples The code samples in this article use theAdventureWorks2022orAdventureWorksDW2022sample database, which you can download from theMicrosoft SQL Server Samples and Community Projectshome page. A. Use ISNULL with AVG The following example finds the average of the weight of all products. It su...
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Now let us see the usage of the ISNULL () function in the SQL server. Code: Select isnull('234567')AS "IS NULL"; Output: The value is not NULL in the given expression, resulting in a returned value of 0. Code: select isnull ('replace value of the NULL') AS "IS NULL"; ...
Examples The code samples in this article use theAdventureWorks2022orAdventureWorksDW2022sample database, which you can download from theMicrosoft SQL Server Samples and Community Projectshome page. A. Use ISNULL with AVG The following example finds the average of the weight of all products. It su...
SQL Server The SQL ServerISNULL()function lets you return an alternative value when an expression is NULL: SELECTProductName, UnitPrice * (UnitsInStock + ISNULL(UnitsOnOrder,0)) FROMProducts; or we can use theCOALESCE()function, like this: ...
Example 1: SQL Server ISNULL function in an argument In this example, SQL ISNULL function returns the second argument value because the first argument is NULL: 1 SELECTISNULL(NULL,100)result; In the following examples, we can see the following. ...