Computing count of intersection of two queries (Relational Algebra --> SQL)

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От Robert James
Тема Computing count of intersection of two queries (Relational Algebra --> SQL)
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Msg-id CAGYyBgiquOZpPh0_aP6tOZZNAu56_gBFq4mZWRMGkj_GRWnvTQ@mail.gmail.com
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Ответы Re: Computing count of intersection of two queries (Relational Algebra --> SQL)  (David Johnston <polobo@yahoo.com>)
Re: Computing count of intersection of two queries (Relational Algebra --> SQL)  (Kevin Grittner <kgrittn@ymail.com>)
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In relational algebra, I have relation R and relation S, and want to
find the cardinality of R, of S, and of R-intersect-S.

I know the SQL for R and S.  What's the best way to compute the
cardinality of each relation (query) and of their intersection?

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