I have an issue translating query from SQL to postgresql

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Hi, everyone. I am translating a sql stored procedure to postgre. And I successfully did it, but when I tried to test it, it throw me an error:

ERROR: table name "my_factors" specified more than once CONTEXT: SQL statement "update my_factors set factor = (my_factors.to_weight/dni_totals.dni_sum) from my_factors join dni_totals on my_factors.transport_order = dni_totals.to_id"

The code from pqslq function is above, I executed the stored procedure in sql and it executed successfully. The code from sql stored procedure is here:

update #myFactors set Factor = (#myFactors.TOWeight/#DNITotals.DNISum)
from #myFactors join #DNITotals on #myFactors.TransportOrder = #DNITotals.TOId

Can anyone give me an advice how to handle this error?

What I have tried:

I don't know what to do, I haven't tried anything.

Posted 24-Jun-19 22:45pm

Member 13992723

Updated 24-Jun-19 23:33pm

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k5054 · Accepted Answer · 2019-06-24T23:34:00

Try

SQL

UPDATE my_factors
    SET factor = my_factors.to_weight/dni_totals.dni_sum
    FROM dni_totals
    WHERE my_factors.transport_order = dni_totals.to_id;

PostgreSQL doesn't like the SET table.column syntax, so you use the unadorned column name there. Additionally, you only need to specify table names if it would be ambiguous which table the column comes from. Whether you omit the table names or not would be an issue of style.

There's a quick tutorial on update/join here: PostgreSQL UPDATE Join with A Practical Example[^]