Rewrite SQL query using isnull and coalesce

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SQL-Server-2012

rewrite below incorrect statement in two ways using isnull and coalesce
select * from Test_Table where Test_ID=null

What I have tried:

rewrite below incorrect statement in two ways using isnull and coalesce
select * from Test_Table where Test_ID=null

Posted 7-Jul-18 2:44am

Chinnu2020

Updated 7-Jul-18 5:09am

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MadMyche · Answer 1 · 2018-07-07T02:57:00

Solution 1

SQL

SELECT    TOP 10 *
FROM      Google
WHERE    (NULL, Coalesce) IN SearchTerms

Posted 7-Jul-18 2:57am

MadMyche

Bryian Tan · Answer 2 · 2018-07-07T05:09:00

Not clear what your question is. But here an example on how to use COALESCE and ISNULL function.

SQL

--if first column/Test_ID is null, use value from second column which is ''
SELECT    *
FROM      Test_Table 
WHERE    COALESCE(Test_ID, '') = ''

--if Test_ID is null, return ''
SELECT    *
FROM      Test_Table 
WHERE    ISNULL(Test_ID,'') = ''

Here you can find out more about the mentioned functions.
COALESCE (Transact-SQL) | Microsoft Docs[^]
Deciding between COALESCE and ISNULL in SQL Server[^]