Latest revision as of 09:29, 1 October 2012

CASE

CASE allows you to return different values under different conditions.

If there no conditions match (and there is not ELSE) then NULL is returned.

  CASE WHEN condition1 THEN value1 
       WHEN condition2 THEN value2  
       ELSE def_value 
  END 

SELECT name, population
      ,CASE WHEN population<1000000 
            THEN 'small'
            WHEN population<10000000 
            THEN 'medium'
            ELSE 'large'
       END
  FROM bbc

See also

• NVL function