For second option, you have syntax error for IF Statements.
Try following :
SELECT COUNT(*) as CNT_TOT, SUM(IF var1 = '""' THEN 1 ELSE 0 ENDIF) AS CNT1_MISSING
Empty string and NULL are different data types.
For second option, you have syntax error for IF Statements.
Try following :
SELECT COUNT(*) as CNT_TOT, SUM(IF var1 = '""' THEN 1 ELSE 0 ENDIF) AS CNT1_MISSING
Empty string and NULL are different data types.