Is NOT EXISTS or LEFT OUTER JOIN...IS NULL more efficient for finding records in one table that aren't in another? Specifically, I'm trying to figure out which of the two queries below is better: ...
Below is the MySQL table layout that I'm working with. Basically, I'd like to increment views, watchers, and inquiries as they occur through the front end of the website. My question is how would I ...
I'm using left join in MySQL as mentioned below: SELECT Q.QUESTION_ID, school_id FROM Q_MASTER AS Q LEFT JOIN ( SELECT keyword, school_id FROM ...
I want to create a temporary table with some select-data. My (strange) problem is that I have to do the same query more than one time. CREATE TEMPORARY TABLE IF NOT EXISTS cache (id int(11) NOT ...
Is there a way to create an index in MySQL if it does not exist? MySQL does not support the obvious format: CREATE INDEX IF NOT EXISTS index_name ON table(column) ERROR 1064 (42000): You have an ...