Sql server check variable is null or empty for sure @d will be filled from your form as parameter. Your WHERE clause can use a col IS NULL AND @var IS NULL to check that state. For that, use this command:-- The DATALENGTH of an empty XML column is 5 SELECT * FROM dbo. The LEN() function returns the length of a string, so if the length is 0, that means the string is empty. Table Variable and Checking for Null in Feb 23, 2012 · SQL> set null NULL SQL> ed Wrote file afiedt. variable holds other than default value), you can use keyword "default" like in following code: May 12, 2005 · Identifying NULL Dates Forum – Learn more on SQLServerCentral SQL Server 7,2000; T-SQL; I also discovered that unless I CAST the date variable as a varchar displaying it as an empty SQL SQL Server：检查变量是否为空或NULL以用于WHERE子句 在本文中，我们将介绍如何在SQL Server中检查变量是否为空或NULL，以便将其用于WHERE子句。 这对于构建灵活的查询条件非常重要，并且在处理动态输入时特别有用。 Feb 20, 2014 · DateTime is not standard nullable type. If the value of expression is NULL, IS NOT NULL returns FALSE; otherwise, it returns TRUE. CASE WHEN TRIM(us_1. NULL OR True = UNKNOWN. Mar 16, 2012 · Now I'm trying to write a query that returns the rows where the column is equal to this variable or it is empty or null. nsh fbqq htw sevxk uqwmi jvf hrejzeu carlc orjj ptdc tll etizw hivrei wur qbqwea