On 28.05.2017 20:19, ml@xxxxxxx wrote:
Hallo,
SELECT *
FROM products
WHERE exists
(SELECT categories.cat FROM categories WHERE
categories.serial==products.category);
categories.serial = products.category); -- one equal sign
or
SELECT * FROM products
WHERE category IN
(SELECT categories.cat FROM categories);
On 28.05.2017 19:03, Michelle Konzack 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?
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