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  1. stackoverflow.com › questions › 334108How do I check if a Sql server string is null or empty

    Use the LEN function to check for null or empty values. You can just use LEN(@SomeVarcharParm) > 0. This will return false if the value is NULL, '', or ' '. This is because LEN(NULL) returns NULL and NULL > 0 returns false. Also, LEN(' ') returns 0. See for yourself run:

  2. stackoverflow.com › questions › 16080139sql - Null or empty check for a string variable - Stack Overflow

    12 gru 2013 · Yes, you could also use COALESCE (@value,'')='' which is based on the ANSI SQL standard: SELECT CASE WHEN COALESCE (@value,'')='' THEN 'Yes, it is null or empty' ELSE 'No, not null or empty' END AS IsNullOrEmpty. DEMO.

  3. www.w3schools.com › sql › sql_isnullSQL ISNULL(), NVL(), IFNULL() and COALESCE() Functions -...

    The SQL Server ISNULL() function lets you return an alternative value when an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + ISNULL(UnitsOnOrder, 0)) FROM Products;

  4. learn.microsoft.com › en-us › sqlISNULL (Transact-SQL) - SQL Server | Microsoft Learn

    3 wrz 2024 · Replaces NULL with the specified replacement value. Transact-SQL syntax conventions. Syntax ISNULL ( check_expression , replacement_value ) Arguments check_expression. The expression to be checked for NULL. check_expression can be of any type. replacement_value. The expression to be returned if check_expression is NULL.

  5. www.baeldung.com › sql › select-null-empty-stringsFind Null or Empty Values in SQL - Baeldung

    6 cze 2024 · The IS NULL operator checks whether the column contains null values. To detect empty values within the column, we compare it against the empty string (”). Sometimes, a column might contain values that consist only of spaces, especially when data is imported from various sources.

  6. www.sqltrainingonline.com › how-to-filter-for-sql-null-or-empty-stringHow to Filter for SQL Null or Empty String

    5 lis 2012 · In this video, I show you how to filter for SQL Null or Empty String in SQL Server 2012. I will also show you a trick to make it easier to filter for both.

  7. learn.microsoft.com › en-us › sqlIS NULL (Transact-SQL) - SQL Server | Microsoft Learn

    3 wrz 2024 · To determine whether an expression is NULL, use IS NULL or IS NOT NULL instead of comparison operators (such as = or !=). Comparison operators return UNKNOWN when either or both arguments are NULL. Examples

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