What is primary key, unique key, and foreign key?
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A table contains list of customers and his city with other details. Each customer has a unique number and the table consists millions of data. Query is: I want to retrieve 10 customers from each city, no script, only from single query?
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i have table students with fields classname,studname select * from students classname studname 1 xxxxx 1 yyyy 1 zzzz 2 qqqq 2 tttt 3 dsds 3 www i want the output should be No of students in class 1 : 3 No of students in class 2 : 2 No of students in class 3 : 2
How do you optimize Sql queries ?
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