MySQL “IN” operator performance on (large?) number of values

Question

I have been experimenting with Redis and MongoDB lately and it would seem that there are often cases where you would store an array of id\'s in either Mongo

Answer 1

You can create a temporary table where you can put any number of IDs and run nested query Example:

CREATE [TEMPORARY] TABLE tmp_IDs (`ID` INT NOT NULL,PRIMARY KEY (`ID`));

and select:

SELECT id, name, price
FROM products
WHERE id IN (SELECT ID FROM tmp_IDs);