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Results tagged with join
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user 151094
An SQL join clause combines records from two or more tables or views.
0
votes
1
answer
51
views
Is it a good idea to have all the join conditions between tables or just use the primary/for...
.
#1
SELECT -some_cols-
FROM tab1 t1
INNER JOIN tab2 t2 ON t1.id=t2.tab1_id
WHERE ......
;
#2
SELECT -same_cols-
FROM tab1 t1
INNER JOIN tab2 t2 ON t1.id=t2.tab1_id AND t1.tax_id = t2.tax_id
WHERE …
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