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I think this is because the query first has to join the tables and then runs the where clause on that, so if you can reduce what is required to join then that's the fasted way to get the results/do the. Left join gets all records from the left linked and the related record from the right.

The fact that when it says inner join, you can be sure of what it does and that it's supposed to be just that, whereas a plain join will leave you, or someone else, wondering what the. Inner join gets all records that are common between both tables based on the supplied on clause. It is an actual join condition, not just a filter), it must appear in the on clause of that join.

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I'm pretty new to python and am completely confused by.join() which i have read is the preferred method for concatenating strings.

27 if a filter enters in a join condition functionally (i.e.

Strid = repr(595) print array.array('c', random.sample( The question and solutions pertain specifically to inner joins. If the join is a left/right/full outer join, then it is not a matter of preference or performance, but one of correct results. Instead, you simply join to both tables, and in your select clause, return data from the one that matches:

Here's a list of equivalent syntaxes: While this seems reasonable, i don't think answers what is an sql join in any way that conveys useful information. If you place it in the where. The thing i'd like to point out though is that if you have appropriate foreign keys in your database, (between post and post_meta) then you probably don't need an explicit join unless you're.