Code: select 'abc'+null

Question

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use set condition in sql server.

query : select 'abc'+null,

execution answer : null,

but i need answer abc while using set condition in sql server.

What I have tried:

while executing answer is null, but i need there 'abc'. while using set condition.

Posted 24-Jul-19 7:45am

Rayalacheruvu Hemanth

Updated 25-Jul-19 3:18am

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3 solutions

Solution 3

Your question is not particularly clear, but I'm guessing that "using set condition" means you're expected to change the SQL Server options for your query. In particular:
SET CONCAT_NULL_YIELDS_NULL (Transact-SQL) - SQL Server | Microsoft Docs[^]

SQL

SET CONCAT_NULL_YIELDS_NULL OFF;
SELECT 'abc' + Null; -- Result: "abc"

NB: This is a bad idea. As the documentation says, this option will be removed in a future version of SQL Server, and should be avoided.

Posted 25-Jul-19 3:18am

Richard Deeming

Solution 2

Adding onto Original Griff's answer; and depending on your needs, you could set up a value to replace null(s) as needed. I typically use an empty varchar for this.

SQL

DECLARE @PossibleNull    VARCHAR(32)
DECLARE @NullReplacement VARCHAR(1) = ''

SELECT 'abc' + Concat(@PossibleNull, @NullReplacement)

If you are wondering, Concat is preferred over the MS SQL only IsNull function as it is part of the ANSI language spec and can also be chained over multiple "replacement" values.

Posted 24-Jul-19 8:17am

MadMyche

Comments

Rayalacheruvu Hemanth 24-Jul-19 22:01pm

yeah, its true,
but its not going to answer my question.

MadMyche 24-Jul-19 22:10pm

Then you need to use the "Improve Question" widget to improve your question; and include ALL of the relevant information. It would be recommended to also include the specific code you are working with in the "What I've Tried" block.

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OriginalGriff · Accepted Answer · 2019-07-24T08:06:00

Solution 1

In SQL NULL is supreme - any operation involving NULL will yield NULL - so if you attempt to add two columns together if either is Null then the result is NULL as well.

Try this:

SQL

SELECT CONCAT('abc', NULL)

And you will get what you wanted: 'abc'

Posted 24-Jul-19 8:06am

OriginalGriff

Comments

Rayalacheruvu Hemanth 24-Jul-19 21:55pm

your answar is correct, but it's not going sute my question.
i ware already told in my question use "set" condition.

OriginalGriff 25-Jul-19 1:11am

So use CONCAT in your SET command ... what part of this is difficult for you?

DECLARE @X NVARCHAR(MAX);
SET @X = CONCAT('abc', NULL);
SELECT @X;