Question

I have a case statement that is as follows:

CASE id
  WHEN '9FDAC41CBF5ED6E3758' THEN 'Invalid' 
  WHEN '5EBF056B16E7593' THEN 'Invalid' 
  WHEN 'EEDC43399D10F44A19E293BB' THEN 'Invalid'
  WHEN '2322' THEN 'No'
  ELSE 'Yes'
END AS [Test]  

Is it possible to put the 3 when clauses in 1 when clause since they are essentially returning the same value?

Answer 1

Yes. See below.

CASE WHEN [SomeColumn] = '9FDAC41CBF5ED6E3758' 
    OR [SomeColumn] = '5EBF056B16E7593' 
    OR [SomeColumn] = 'EEDC43399D10F44A19E293BB'
THEN 'Invalid'
WHEN '2322' THEN 'No'
ELSE 'Yes'END AS [Test]  

You could also use IN

CASE WHEN [SomeColumn] IN('9FDAC41CBF5ED6E3758', '5EBF056B16E7593', 'EEDC43399D10F44A19E293BB')
THEN 'Invalid'
WHEN '2322' THEN 'No'
ELSE 'Yes'END AS [Test]