how to compare a variable with secnd column if first column is null in sql?

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How to compare a variable in where condition to second column if first column is null ?

my sql query is like below

SQL

select * from table where column1 = @variable

now i want is if the value of column1 is null then it should check with column two. if the value of column1 is not null it should compare with that column only.

SQL

select * from table where column2 = @variable

Posted 2-Jun-14 20:17pm

ravikhoda

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4 solutions

Solution 2

Try like this :

SQL

select * from table 
where 
Case WHEN column1 is not null 
THEN
column1 
 ELSE
 column2 END = @variable

Posted 2-Jun-14 20:31pm

syed shanu

Solution 3

select * from table where column1 = @variable
CASE WHEN IsNull(column1)=1 THEN column1==@variable ELSE column2==@variable END

Posted 2-Jun-14 20:49pm

Nivedita_Parihar

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soumyajayaraj · Accepted Answer · 2014-06-02T20:20:00

Solution 1

SQL

select * from table where column1 = @variable OR (column1 IS NULL AND column2 = @variable)

Posted 2-Jun-14 20:20pm

soumyajayaraj

Updated 2-Jun-14 20:27pm

v3

Chris Quinn · Accepted Answer · 2014-06-02T23:39:00

Solution 4

SQL

select * from table
where
 @variable = IsNull([Column1], [Column2])

Posted 2-Jun-14 23:39pm

Chris Quinn