Question

guys,

I have two tables:

Table 1:

UID    NAME
1      Name1
2      Name2
3      Name3

Table 2:

UID    PID    PARAM
1      1     10
2      1     20
3      2     10
4      2     30
5      2     40
6      3     60
7      3     20
8      3     10

I need to join the two tables (t1.UID=t2.PID) and to list only the records from the first table, that have (for example) BOTH PARAM=10 AND PARAM=20 in the second table. This way, for this example, the query should return:

UID      NAME
1        Name1
3        Name3

..because only Name1 AND Name3 have the BOTH PARAM=10 AND PARAM=20

How can I do this? I know it’s probably very simple, but I can’t find the answer nor here, neither in google.

Thank you in advance!
Ned

Answer 1

select a.name          
from table1 a
inner join table2 b on (a.UID = b.PID)
where b.param in (10, 20)
group by a.name
having count(*) = 2

by declaring your table table1 a, you can call any columnfrom this table by putting the tables declared name in from of the column a.name