I'm pretty new to Python and am completely confused by .join() which I have read is the preferred method for concatenating strings. I tried: strid = repr(595) print array.array('c', random.sample(

Apr 12, 2016 · В чем разница между INNER JOIN и OUTER JOIN? Что означают LEFT JOIN, RIGHT JOIN и FULL JOIN? Перевод вопроса «Difference between INNER and OUTER joins» @cdv.

A join condition differs from a filter in that in related tables together. A filter only applies to one table, such as in the example I wrote (table t2.column = 5).

Jan 2, 2009 · 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 JOIN B A JOIN B Also take a look at the answer I left on this other SO question: SQL left join vs multiple tables on FROM line?.

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 standard said about the implementation and was the INNER/OUTER/LEFT left out by …

Theta-join is analogous to a special case of inner join where the on is a theta comparison on of a column from each. Some decades after Codd defined them some textbook (s) misdefined theta join as a generalization that is the analogue of inner join.

Oct 18, 2016 · Is it possible to do the following: IF [a] = 1234 THEN JOIN ON TableA ELSE JOIN ON TableB If so, what is the correct syntax?

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 trying to load a large number of records.

Jul 20, 2023 · A lot of answers are just giving what .join () does. But I think the actual question is what is the point of .join () when it seems to have the same effect as running your script without threading.

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. The SQL Cookbook (§ 11.3. Incorporating OR Logic when Using Outer Joins) demonstrates the difference between the join and where conditions.