On Sun, May 28, 2017 at 10:33 PM, Michelle Konzack <linux4michelle@xxxxxxxxx> wrote:
Hello *,
I try to get columns from my database with a singel SELECT, but I stuck.
I have 3 tables like:
1) categories (serial,cat)
2) manufacturers (serial,m_name)
3) products (serial,category,manufacturer,p_name)
where the "category" and "manufacturer"
are numerical IDs from the two tables above.
So I like to replace the numerical IDs with the appropriated values,
mean
SELECT * FROM products WHERE category IN
(SELECT categories.cat FROM categories WHERE
categories.serial==products.category);
But I get:
ERROR: operator does not exist: integer==integer
LINE1: ...gories.cat FROM categories WHERE categories.serial==products.category);
^
Hmm, "serial" is an "integer" and the "category" and "manufacturer" too.
So whats wrong with it?
--
Michelle Konzack Miila ITSystems @ TDnet
GNU/Linux Developer 00372-54541400
Wouldn't a simple join like the one below suffice:
Select a.*,b.cat from products as a, categories as b where a.category=b.serial
or am I missing something?
