sql server - Subquery returned more than 1 value. SQL error -

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this error has it. dont know do. please me.

subquery returned more 1 value. not permitted when subquery follows =, !=, <, <= , >, >= or when subquery used expression.

update kho /*set kho.xuat = sum(phieuxuat.sl)*/ set kho.xuat = (select sum(phieuxuat.sl) sluong phieuxuat group phieuxuat.mavt) kho inner join phieuxuat on (kho.mavt = phieuxuat.mavt)

this means subquery returned more 1 row not allowed. can write update statement as:

update k      set k.xuat = (select sum(p.sl) phieuxuat p p.mavt = k.mavt) kho k

note added where clause inside subquery. removed join prevent multiple updates on same row.


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