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El problema surge porque trata de poner NULL en los registros sin pareja.

Se puede resolver agregando una condición despues del segundo select,  que
solo actualice los registros de tabla1 que si estan en tabla2

... /CAMPO1) where tabla1/campo1 in (select campo2 from tabla2)

foros_informat@panalon.com escribió:

> Necesito actualizar varios campos de importes de una tabla, una solución
> seria por SQL
> con una sentencia tal como :
>        UPDATE librería/tabla1 SET
>             (Importe1, Importe2, Importe3) = (SELECT IMP1, IMP2, IMP3 FROM
> LIBRERÍA/TABLA2
> WHERE TABLA2/CAMPO2 = TABLA1/CAMPO1 )
>  esto funcionaria bien si todo CAMPO1 estuviera en tabla2/campo2, pero mi
> caso no es ese
> y me da error la sentencia.
> ¿COMO PODRIA SOLUCIONARLO?
>
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