Interview preparation Mysql


I have to give interview on sql , data mapping .I have solved many problem on Hacker rank but i cannot solve each and every one infect i was unable to solve many of them .Do it mean i am not prepare for interview .Can any one recommend interview questions on sql. I have tried to google it but there were much resources there and i have also prepare from one of it but it was too theory there and do not have questions .I want to practise questions .Any one know about it .


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