Question

The query is

Select id from TableA 
where typ_cd="NT"
 and id not in
( select id from TableA where typ_cd="BB")

I need to find those id’s whose type_cd =”NT” and compare those id’s with the same table which are not present for type_cd=”BB” .I pretty confused why the above query is not returning the correct values.

Edit: -I’m referencing the same table and there are no null values for the column ID

Please let me know how can i achieve the same result in sql server so that i can try to write an equivalent query in sybase

 TableA

id typ_cd
 1   NT
 1   BB
 3   NT
 4   NT
 4   BB

I need the id=1 as the result since the id=1 is present for typ_cd=NT but not for typ_cd=BB
But at present with the above query im getting null in sybase

Answer 1

Replace the double quotes with single quotes.

Select id from TableA 
where typ_cd='NT'
 and id not in
( select id from TableA where typ_cd='BB')