How to write such a query - Mailing list pgsql-general

From Igor Korot
Subject How to write such a query
Date
Msg-id CA+FnnTzwZv4x8cuLWYBoOJecaXS1qFOaLPrkopF-LWkKoBNP1w@mail.gmail.com
Whole thread Raw
Responses Re: How to write such a query  (Jonathan Strong <jonathanrstrong@gmail.com>)
Re: How to write such a query  (Paul Förster <paul.foerster@gmail.com>)
Re: How to write such a query  (Thomas Kellerer <shammat@gmx.net>)
List pgsql-general
Hi,
Consider following

[code]
CREATE TABLE X(id INTEGER PRIMARY KEY, field1 char(50), field2 int);
CREATE TABLE Y(id INTEGER PRIMARY KEY, field1 char, field2 double(10, 2));
SELECT X.field1, Y.field2 from X, Y WHERE X.id = Y.id;
[/code]

Assuming that the SELECT return 10 rows, I want to update X.field1
in row 5.

How do I write a WHERE clause in the

[code]
UPDATE X.field1 SET X.field1 = '<some_string>' WHERE....
[/code]

Thank you.



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