7 сент. 2015 г. · I have a relatively simple query on a table with 1.5M rows: SELECT mtid FROM publication WHERE mtid IN (9762715) OR last_modifier=21321 LIMIT 5000;

7 сент. 2023 г. · A subquery is typically faster, especially when the optimizer can simplify the query - like in your case. The CTE processes the whole table and materializes ...

27 июн. 2020 г. · To get an actual performance boost, LEFT JOIN to the aggregating subquery, but repeat the (selective!) predicate of the outer query.

6 окт. 2022 г. · The original query is very fast for it's complexity. Roughly 400ms. However as soon as we wrap it with the count operation it slows down to 20 seconds.

24 дек. 2021 г. · I have a queue system that has two tables, jobs and jobs_queues. jobs is where we put jobs to run and job_queues we populate with queue names.

5 февр. 2020 г. · If you write a correlated subquery like that, PostgreSQL will always perform a nested loop with the subquery as inner loop.

6 февр. 2024 г. · As shown above, if I join the two on specific IDs (as a test), the overall query is extremely fast (~150ms). However, when joining on the ...

16 авг. 2019 г. · This query 'only' takes 37s without the embeded selects. What I basically want is to divide SUM(notional_usd) for each hour by the max value.

3 окт. 2019 г. · I am looking to migrate our support database from MS SQL Server to Postgres and most of it has gone OK. However, some of the queries seem to be ...

6 февр. 2015 г. · Instead of using a huge IN -list, join on a VALUES expression, or if the list is large enough, use a temp table, index it, then join on it.