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Use of Trim to check-SELECT FirstName FROM UserDetails WHERE TRIM(LastName) IS NULL. Use of LTRIM & RTRIM to check-SELECT FirstName FROM UserDetails WHERE LTRIM(RTRIM(LastName)) IS NULL. Above both ways provide same result just use based on your DataBase support. It Just returns the FirstName from UserDetails table if it has an empty LastName
What is best way to check if value is null or empty string in Postgres sql statements? Value can be long expression so it is preferable that it is written only once in check. Currently I'm using: coalesce( trim(stringexpression),'')='' But it looks a bit ugly.
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;
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.
In a table, I basically have to treat NULLs, empty strings and (pure) whitespace as 'blanks' and count the number of non-blank cells. The table contains a mix of numeric , bit and nvarchar columns.
The ISNULL () function is used to check if a value is null and if it is will return the replacement value specified when calling the function. Understanding NULL Values. Before we get into the details of the function it is important to make sure we understand what a NULL value is in SQL Server.
18 mar 2015 · How does one indicate an empty string when it should be separate and distinct from a null? To mitigate the possibility of misinterpretations, it is important to: Know your data: Understand the technical structure of the data and what it represents to your employer or client.
