Tried to find the answer, but still couldn't.. The table is as follows:
name, room_chat
Ratna 2
Ima 2
Ratna 3
Yanis 3
i need something like this if i select name from table where (name='Ratna' and name='Ima')
i get a result
room chat
2
Thanks in advance
在in子句中使用如下:
select distinct a.room_chat from tableA a where a.name in ('Ratna', 'Ima')
You have several rows, but you want to look at a set of rows. This is called aggregation. In your case you want to look at each room chat, so you group by room_chat
. You want to know whether for a room chat you find both names, so count the names.
The query:
select room_chat
from table
where name in ('Ratna','Ima')
group by room_chat
having count(distinct name) = 2;
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