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select n rows from each department


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I have a big student database, it has only one table. I want to select 10 student each department on a single mysql query.

 

+---------------------------------------------------------+----------------------+

| student | Dept |

+---------------------------------------------------------+----------------------+

| gooch | physics |

| aaaaa | mathss |

| dvssdg | maths |

| sfgsfg | chemistry |

| gcbcvb | chemistry |

| dgsgsfg | arch |

 

I have a big list like this.. I have to select ten student from each department. how shall I achieve it?

 

Also I want to select student in random each time.

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