Question

I am writing a query in which where clause have IN clause and there are large number of values in this IN clause , I want to fetch the result such that if there is no value exist in table for value given in IN clause then a raw containing 0 or null should return for that value. for example..

select age,sex,date_joining from emp where name IN ('amit','john','paul','dilip')

Now assume for this query ,data for john and paul does not exist in database then result should be like below..

21    male   21-AUG-2011
null  null   null
null  null   null
25    male   9-aug-2010

we can also have 0 instead of null if null is not possible

Thanks…

Answer 1

select  filter.name
,       emp.age
,       emp.sex
,       emp.date_joining 
from    (
        values ('amit'), ('john'), ('paul'), ('dilip')
        ) filter(name)
left join    
        emp
on      emp.name = filter.name

Live example at SQL Fiddle.

For older values of SQL Server, replace the line with values by:

from    (
                  select 'amit'
        union all select 'john'
        union all select 'paul'
        union all select 'dilip'
        ) filter(name)