How to get a column?

Question

MySQL

Greetings, I have remotely written a query code:
SELECT * FROM `DB` WHERE `id_key` = ''
All I can do is substitute the filter value by column into the `id_key` key. I can't change the request itself. Maybe there are ways to substitute something in empty quotes and get the entire column without filtering?

Answer 1

Can only be somehow

SELECT * FROM `DB` WHERE `id_key` > 0
SELECT ID FROM `DB` WHERE `id_key` > 0
SELECT ID FROM `DB` WHERE `id_key` < 1
SELECT * FROM `DB` WHERE `id_key` = ok
SELECT value FROM `DB` WHERE `id_key` = 1
SELECT value FROM `DB` WHERE `id_key` != ok
SELECT value FROM `DB` WHERE `id_key` = ok

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