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From: Laurenz Albe <[email protected]>
To: e-letter <[email protected]>
To: [email protected]
Subject: Re: insert into table with nest query
Date: Thu, 27 Apr 2023 11:28:03 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAET1fe5dXJGcvFFV=RzOQ3q+d-vVXK4k0ARb8QbA47Vyuv43nA@mail.gmail.com>
References: <CAET1fe5dXJGcvFFV=RzOQ3q+d-vVXK4k0ARb8QbA47Vyuv43nA@mail.gmail.com>

On Tue, 2023-04-25 at 16:43 +0100, e-letter wrote:
> table1
> column1,column2
> value1,value2
> 
> table2
> column2,column3
> value2, value3
> 
> table3
> column1,column2,column3
> value1,value2,value3
> 
> When value3 is first entered into table2, what are the correct
> commands for value2 (in table2) and value1 (in table1) to be selected
> for insertion into table 3?
> 
> INSERT INTO table3 SELECT ... WHERE value3='...';
> 
> The conceptual difficulty is how to use nested query correctly, or is
> there a better method? Thank you.

The question is a bit unclear, but perhaps you mean

INSERT INTO table3 (column1, column2, column3)
SELECT table1.column1,
       table1.column2,
       table2.column3
FROM table1
   JOIN table2 USING (column2)
WHERE table2.column3 = 'value3';

Yours,
Laurenz Albe

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