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

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