Check duplicate names in SQL server table

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Hi all,
i have below table like this.
id name class
1 A null
2 B null
3 c null
4 d null
1 A 9
3 c 9

how to check data with bit value is exist or not. i need below output.

id name class exist
1 A null 0
2 B null 0
3 c null 0
4 d null 0
1 A 9 1
3 c 9 1

regards
Kishore

What I have tried:

SELECT  Id,name,class
(case when isnull(class,123)=123 then 0 else 1 end) as exist
FROM                                 test_Table

Posted 28-Aug-17 4:50am

nandkishorre

Updated 28-Aug-17 5:19am

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OriginalGriff · Answer 1 · 2017-08-28T05:19:00

Add a comma...

SQL

SELECT  Id,name,class
(case when isnull(class,123)=123 then 0 else 1 end) as exist
FROM                                 test_Table

Becomes:

SQL

SELECT  Id,name,class,
(case when isnull(class,123)=123 then 0 else 1 end) as exist
FROM                                 test_Table

But I'd probably do it a safer way:

SQL

SELECT  Id, Name, Class, CASE WHEN Class IS NULL THEN 0 ELSE 1 END AS Exist
FROM test_Table