sql - i have a set of account numbers to which i have to map 12 months data in respective months column -

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i have set of account numbers .i need map values 12 months against account numbers in respective month.

while using update query throws more 1 value being thrown . please suggest.

upate balances set inrambfeb14=feb14.inramb  feb14  balance.accountno=feb14.accountno 

 cte ( select accountno,max(inramb) inramb  feb14 group accountno ) update balances set inrambfeb14 = cte.inramb    cte join balances bal on bal.accountno = cte.accountno

this give max value update...

for more suitable answers should give input data & expectation clearly


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