Dear all,
I need to count all pairs of instances which occure under given ID
number, e.g.:
ID word
-------------
1 car
1 fruit
2 car
2 fruit
2 vegetable
3 car
3 vegetable
And the output should be simillar to:
car fruit 2
car vegetable 2
fruit vegetable 1
Any suggestion how to do that in PgSQL? Thanks in advance for any pointers.
Cheers, Andrej
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
