57 lines
1.8 KiB
SQL
57 lines
1.8 KiB
SQL
SELECT * from r1;
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SELECT * from r2;
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-- Projektion PROJ(r1, A, B)
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select R1.A, R1.B
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from R1
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-- Restriction REST(r1, A=1)
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select *
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from R1
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where R1.A=1
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-- Produkt PRODUCT(R1, R2)
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select *
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from R1, R2
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-- Difference, DIFFERENCE(R1, R2)
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select R1.A, R1.B, R1.C
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from R1
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except
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select R2.A, R2.B, R2.C
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from R2
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-- Schnittmenge (Intersection), INTERSECT(R1, R2)
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select R1.A, R1.B, R1.C
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from R1
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intersect
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select R2.A, R2.B, R2.C
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from R2
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-- Vereinigung (Union), UNION(R1, R2)
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select R1.A, R1.B, R1.C
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from R1
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union
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select R2.A, R2.B, R2.C
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from R2
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-- Inner Join, JOIN(R1, R1.A=R2.A, R2)
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select *
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from R1 inner join R2
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on R1.A = R2.A
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-- Outer left Join, JOIN(R1, R1.A*=R2.A, R2)
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select *
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from R1 left join R2
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on R1.A = R2.A
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-- Outer rigth Join, JOIN(R1, R1.A*=R2.A, R2)
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select *
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from R1 right join R2
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on R1.A = R2.A;
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-- Full Outer Join, FULL OUTER JOIN(R1, R1.A=R2.A, R2)
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select *
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from R1 full join R2
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on R1.A = R2.A;
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