sql - MYSQL get AVG for each row -

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i need avg each row of table. lets have

id  val  1   5 2   6 3   7

i need 

id  val  1   0.277   (5/18) 2   0.333   (6/18) 3   0.388   (7/18)

can easy in mysql without joining same table?

you can sum val column , divide val column sum.

select id, 1.0*val/(select sum(val) tablename) val tablename

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