RE: Query will execute when inner query have issue

Greetings

I did the following excise.

CREATE TABLE product(
productid int PRIMARY KEY,
productname CHARACTER VARYING NOT NULL);

INSERT INTO product values (1,'Pen');
INSERT INTO product values (2,'Pencil');

CREATE TABLE sales(
salesdate date,
product int,
qyt int);

INSERT INTO sales VALUES ('2020-01-22',1,10);
INSERT INTO sales VALUES ('2020-01-22',2,20);

select productid from sales where salesdate='2020-01-22';
ERROR: column "productid" does not exist
LINE 1: select productid from sales where salesdate='2020-01-22'

But the following query will executed
select * from product where productid in (select productid from sales where salesdate='2020-01-22')

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________________________________
From: Daniel Gustafsson <daniel(at)yesql(dot)se>
Sent: Thursday, January 23, 2020 3:25:53 PM
To: selva kumar <selva(dot)logic(at)hotmail(dot)com>
Cc: pgsql-bugs(at)lists(dot)postgresql(dot)org <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: Query will execute when inner query have issue

> On 23 Jan 2020, at 08:34, selva kumar <selva(dot)logic(at)hotmail(dot)com> wrote:
>
> Greetings,
>
> We tried query in a following manner.
>
> SELECT * FROM A where A.id IN (SELECT B.id from B);
>
> In the above query Table B does not have id. But this query return all A table records
>
> Note : If we run inner query alone, It throws error like “Field is not found”

This is not reproducible for me, it fails as expected:

db=# select * from a where a.id in (select b.id from b);
ERROR: column b.id does not exist
LINE 1: select * from a where a.id in (select b.id from b);
^
HINT: Perhaps you meant to reference the column "a.id".

Which version of postgres are you using, and how are you executing the query?

cheers ./daniel