select - Querying SQL for multiple records -

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i have table containing information, , wish make select query retrieve wanted informations.

my table looks like,

column1     column2     column3     ... company1    doc1 company1    doc2 company1    doc3 company2    doc1 company2    doc3 company3    doc1 ...

so want is, select companies containing 3 documents. is, if compan1 contains doc1, doc2, doc3, select it. if contains doc2 , doc3, or else, not select it.

so overall, want overview of companies containing exact 3 documents.

hope gives sense :).

select column1 the_table column2 in ('doc1', 'doc2', 'doc3') group column1 having count(distinct column2) = 3;

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