SQL: what's the difference between INNER and LEFT join in DELETE statement?
When doing a delete I can zap rows in two or more tables by doing a
DELETE a, b FROM
LEFT JOIN table2 b on (a.id = b.id)
I can also do an
DELETE a, b FROM
INNER JOIN table2 b on (a.id = b.id)
What exactly is the difference between these two?
And what about other joins
Does it make sense to use other join types in a
delete statement and how would these be useful?
What's the difference between a delete ... join and using a foreign key
If I set a foreign key with a
ON DELETE CASCADE clause:
- Does that match an
INNER or 'LEFT' join (or none of the above)?
- Is that somehow 'better' (faster/more secure) than using a join?
I'm using MySQL, but I'd also like to know which other databases support it.
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