Compare two statements suite

Hello world

Need your expert comments below two motions, I mean why they failed to pick up the same number of lines.

They are not the same things?

SELECT a.a., a.b

A,.

b

WHERE a.c! = b.c

AND a.d! = comics

SELECT a.a., a.b

A

WHERE NOT EXISTS (SELECT * FROM b WHERE b = a.c)

AND NOT EXISTS (SELECT * FROM b WHERE the comic = a.d)

Is there a more orderly way to do this?

your intentions may suggest another possibility (not always effective) (if c and d values are considered of the same line)

Select a, b

from table_a

where (c and d) not in (select c and d of table_b)

Concerning

Etbin

Tags: Database

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