46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
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/* What are the suppliers that supply all parts using NOT EXISTS */
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/* sp difference A */
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select DISTINCT snumber
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from spj as c
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where not EXISTS
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/* A */
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/* Cross Product */
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(select DISTINCT b.snumber
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from part as a cross join spj as b
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where c.snumber = b.snumber and not EXISTS
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/* difference cross product sp */
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(select snumber, pnumber from spj
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where b.snumber = spj.snumber and a.pnumber = spj.pnumber));
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/* What are the suppliers that supply all parts using NOT EXISTS * */
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/* sp difference A */
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select DISTINCT snumber
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from spj as c
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where not EXISTS
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/* A */
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/* Cross Product */
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(select *
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from part as a cross join spj as b
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where c.snumber = b.snumber and not EXISTS
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/* difference cross product sp */
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(select * from spj
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where b.snumber = spj.snumber and a.pnumber = spj.pnumber));
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/* What are the suppliers that supply all parts using NOT EXISTS *, list their names and their cities */
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select snumber, sname, city from supplier
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WHERE snumber in
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(/* sp difference A */
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select DISTINCT snumber
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from spj as c
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where not EXISTS
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/* A */
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/* Cross Product */
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(select *
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from part as a cross join spj as b
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where c.snumber = b.snumber and not EXISTS
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/* difference cross product sp */
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(select * from spj
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where b.snumber = spj.snumber and a.pnumber = spj.pnumber)));
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