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Results tagged with join
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user 9956
An SQL join clause combines records from two or more tables or views.
0
votes
1
answer
225
views
Would it be better to do a sepparate query instead of a left JOIN?
SELECT r.id, r.name,
rp.explanation preparation,
g.name
FROM recipes r
LEFT JOIN recipes_preparation rp ON r.id = rp.fk_recipes_id AND rp.in_use = 1
JOIN glassware g ON r.fk_glassware_id … And it looks like it uses ALL as the join type - which is not good since that is a full table scan according to the MySQL Refrence.. …
- 185
0
votes
2
answers
190
views
Is my JOIN syntax not valid? And have I understood JOIN correctly?
FROM table_a a
JOIN table_b b ON b.fk_table_a_pk = a.pk
JOIN table_c c ON c.fk_table_a_pk = a.pk
they're both RIGHT tables relative to table_a? And if I continue like this:
.... … JOIN table_c c ON c.fk_table_a_pk = a.pk
JOIN table_d ON d.fk_table_c_pk = c.pk
now table_c is still RIGHT relative to table_a, but is now also LEFT relative to table_d - and of course then table_d …
- 185