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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 answer as a whole is a reference written for people who already. 27 if a filter enters in a join condition functionally (i.e. I'm pretty new to python and am completely confused by.join() which i have read is the preferred method for concatenating strings.

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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.

The question and solutions pertain specifically to inner joins.

Instead, you simply join to both tables, and in your select clause, return data from the one that matches: 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. While this seems reasonable, i don't think answers what is an sql join in any way that conveys useful information.

Here's a list of equivalent syntaxes: A left join b a left outer join b a right join b a right outer join b a full join b a full outer join b a inner. 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. 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.