ORACLE SQL CAST IN CASE STATEMENT

Question

Is there a way to CAST as an INTEGER within a CASE Statement ?

CASE 
WHEN SV.END_DATE IS NOT NULL THEN SV.END_DATE - SV.START_DATE 
ELSE 0
END AS DAYDIFF

Answer 1

Yes, you could cast the value to a numeric data type with no fractional part:

CASE 
  WHEN SV.END_DATE IS NOT NULL THEN
    CAST(SV.END_DATE - SV.START_DATE AS NUMBER(38))
  ELSE 0
END AS DAYDIFF

or you could truncate the result , which also strips the fractional part of the value:

CASE 
  WHEN SV.END_DATE IS NOT NULL THEN
    TRUNC(SV.END_DATE - SV.START_DATE)
  ELSE 0
END AS DAYDIFF