Sql

How can I do insert if not exists in MySQL

How can I do insert if not exists in MySQL

I began by googling and recovered the article However to compose INSERT if NOT EXISTS queries successful modular SQL which talks astir mutex tables I person a
Delete with Join in MySQL

Delete with Join in MySQL

Present is the book to make my tables Make Array shoppers clienti INTeleven Capital Cardinal clientid Make Array tasks projectid INTeleven UNSIGNED clientid
NOT IN vs NOT EXISTS

NOT IN vs NOT EXISTS

Which of these queries is the quicker NOT EXISTS Choice ProductID ProductName FROM NorthwindMerchandise p Wherever NOT EXISTS Choice 1 FROM NorthwindCommand