Re: How to write such a query - Mailing list pgsql-general
Hi, Johnathan,
On Fri, Sep 18, 2020 at 12:34 PM Jonathan Strong <jonathanrstrong@gmail.com> wrote:
Are you looking to arbitrarily update the field in the fifth row, or can the row that needs to be updated be isolated by some add'l attribute? What's the use case?
What do you mean?
I don't have any other attributes.
I want to understand how to emulate MS Access behavior, where you have a form
with the arbitrary query, then you can go to any record in that form and update any field.
Is it even possible from the "pure SQL" POV? Or Access is doing some VBA/DB/4GL magic?
Thank you.
On Fri, Sep 18, 2020 at 1:27 PM Igor Korot <ikorot01@gmail.com> wrote: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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