Question

Okay let me do a better job explaining this. Assume I have a person column and a type column. The same person could be in the table multiple times, but with different types. I want all the people who have a specified type UNLESS they are listed with other types.

So given this data

Person  Type
--------------
Bob     S
Sue     S
Bob     O
Tom     S
Frank   S
Frank   R

I want to see Persons who have the Type S, but are also not listed with either Type O or R. So my query should return

Person  Type
--------------
Sue     S
Tom     S

Thanks!

Answer 1

This will do:

SELECT person
FROM table
GROUP BY person
HAVING MIN(type) = 'S' AND MAX(type) = 'S'

However if you have multiple records for the same person and type ‘S’, then this will remove those duplicates