22 авг. 2023 г. · Generally a straight up join is better because it's easier to read. Leave subqueries (and the very closely related CTE) to complex queries and edge cases where ...

16 янв. 2023 г. · Use a subquery: One way to improve the performance of the second query is to use a subquery that retrieves the primary key values from TableB ...

10 апр. 2021 г. · I am currently optimizing an existing system's queries and I was wondering on how I should approach using left joins with around 25 tables.

27 июн. 2023 г. · I'm hoping that someone can explain the nuance in the difference I see in the performance from using the value of a subquery as a column value vs joining the ...

21 окт. 2023 г. · Especially if you join against multiple tables, this can avoid Cartesian explosion and improve performance significantly. I've seen many ...

1 мар. 2024 г. · I have two queries that lead to the same result set. One has an EXISTS, and is very slow (4 minutes+), the other has a LEFT JOIN and it is very fast (<1 sec).

2 февр. 2015 г. · Join's will always perform better (in any sane relational DB anyway) than a sub-query to produce the same result set with the exception of the exist/"not exist ...

28 февр. 2023 г. · I have a view which uses LEFT JOIN LATERAL for one column. When I select other columns from the view, the lateral join is still evaluated by the planner and ...

26 дек. 2023 г. · CTEs and JOINs don't really accomplish the same thing, so this is tough to answer. Fundamentally, a CTE should be identical to a subquery or ...

12 июл. 2023 г. · I think there's definitely a lot of good uses for the lateral join, but I just don't think it should be used unless it's needed.