SQL速记

1. 集合操作

?

?

?

WITH a AS ( SELECT 1 id

UNION

SELECT 2

),

b AS ( SELECT 1 id

UNION

SELECT 3

)

SELECT *

FROM a

EXCEPT

SELECT *

FROM b;

?

WITH a AS ( SELECT 1 id

UNION

SELECT 2

),

b AS ( SELECT 1 id

UNION

SELECT 3

)

SELECT *

FROM a

INTERSECT

SELECT *

FROM b

?

?

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