Question

I want to execute this query in SQL Server but it didn’t work :

Select Nom from tab
  WHERE 
Nom  LIKE
CASE WHEN libelle !='' then
  Nom1 
OR 
 Nom2  
else 
 Nom3
end

Any help wil be appreciate

UPDATE: Added from OP comment:

I want to verify if libelle not empty nom like nom1 or like nom2 else (if libelle is empty) nom like nom3

Answer 1

I don’t feel that case is the right way to go here, so I’m seeing this as more like:

select Nom
from tab
where (
    libelle != ''
    and (
        Nom like Nom1
        or Nom like Nom2
    )
)
or (
    libelle = ''
    and Nom like Nom3
)

To me, this seems simpler to read and understand. The query optimizer might even agree.