Question

I’d appreciate some help with following query.. I have a table as below,

UID | Status | Msg_Id | Msg_Id_type
1   | START  | AA     | GLOBAL
2   | END    | AA     | GLOBAL
3   | PROC   | AA     | GLOBAL
4   | START  | BB     | GLOBAL
5   | START  | CC     | GLOBAL
6   | START  | DD     | GLOBAL
7   | END    | DD     | GLOBAL

What I’d like to achieve is SELECT only those records, that do not have any other STATUS than “START” for a given MSG_ID or all records that do not have any other STATUS except “START”. Thanks much for the help.

Answer 1

This will give you all msg_ids that have only START as their status.

select msg_id
from the_table
where msg_id in (select msg_id from the_table where status = 'START')
group by msg_id
having count(distinct status) = 1