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SQL - update table problem...

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Hi,

i'm trying to make update on multiple tables but don't know how.
is something like this posible with postgresql?

update table1
join table2 on (table1.id=table2.t1)
join table3 on (table2.id=table3.t2)
set table1.name='test', table2.sum=table1.x+table2.y, table3.cell='123456789'
where table1.id=6

i know that this syntax is not supported with postgres but i tried to rewrite the code using this synopsis:

UPDATE [ ONLY ] table SET column = { expression | DEFAULT } [, ...]
 [ FROM fromlist ]
 [ WHERE condition ]

i failed again.
updating multiple tables, can it be done?

thanks for help

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