Which one is better join or subquery?
The advantage of a join includes that it executes faster. The retrieval time of the query using joins almost always will be faster than that of a subquery. By using joins, you can maximize the calculation burden on the database i.e., instead of multiple queries using one join query.
Is it faster or join?
10 Answers. Theoretically, no, it shouldn’t be any faster. The query optimizer should be able to generate an identical execution plan. However, some database engines can produce better execution plans for one of them (not likely to happen for such a simple query but for complex enough ones).
How to join with limit 1 in MySQL?
MySQL JOIN with LIMIT 1 on joined table. SELECT c.id, c.title, p.id AS product_id, p.title FROM categories AS c JOIN products AS p ON c.id = p.category_id. This would get me all records in products, which is not what I want. I want 1 [the first] product per category (I have a sort column in the products field).
Do you interfer only to limit the result set?
LIMIT should interfer only to limit the result set (i.e., if I do a LIMIT 4, I got only the first 4 rows of the above result set). Thanks for contributing an answer to Database Administrators Stack Exchange! Please be sure to answer the question.
Can a select with order by benefit from a limit?
So a select with order by does not benefit much from a limit. However, there are RDBMSs that can utilize a sorting algorithm that needs less memory and is faster when a limit clause is provided. It is in this case enough to just store the currently first n rows and move them out of memory as earlier rows come along.
Is it good to use limit in subqueries?
Doing LIMIT inside subqueries may not always be the answer because of the cardinality of indexes, the data content, and the result set size from the LIMIT. If you have all your “ducks in a row” (Have the four principles in mind for your query), you can get surprisingly good results.