Re: using limit

This really depends on the type of query you’re talking about. If there’s only one row in the table you’re querying then no, I don’t think it’ll change anything. If you’re querying a single row using a primary key it shouldn’t change anything. If you’re doing an aggregate query, say a sum of a bunch of rows, it also won’t improve performance.

If you’re doing a query on a table with multiple rows and not filtering by a primary key or other unique index then yes, it will improve the query.

Hi

I really like to do efficient SQL queries so, my question is if I am expecting no more than one row from a select, using  the LIMIT 1 could improve the performance?

If I use my logic, the LIMIT 1 instruction tell to postgres that stop searching when found 1 record, but maybe it is unnecessary

Thanks

Anibal