Question

This is the MySQL table structure that I have:

itemID (BIGINT) userID (BIGINT) wasAdded (DATETIME) 

I need to get the number of items introduced in the current day, by the X userID

What would be the most efficient way to do this?

Thanks

Answer 1

The best way would be to add an index that covers userID and wasAdded, then you can do

SELECT COUNT(*) FROM my_table WHERE userID = 'X' AND wasAdded BETWEEN CONCAT(CURDATE(), ' ', '00:00:00') AND CONCAT(CURDATE(), ' ', '23:59:59'); 

This shouldn’t even need to read from the table, as all the data it needs is in the index.