query “not equal” doesn't work

Question

I have very simple query like this:

SELECT * FROM `all_conversations` WHERE `deleted_1` != \'1\';

And my deleted_1 be default

Answer 1

Can you try this: deleted_1 is not null and deleted_1 != '1'?

mysql> select 0 is not null and 0 != '1', 1 is not null and 1 != '1', null is not null and null != '1';
+----------------------------+----------------------------+----------------------------------+
| 0 is not null and 0 != '1' | 1 is not null and 1 != '1' | null is not null and null != '1' |
+----------------------------+----------------------------+----------------------------------+
|                          1 |                          0 |                                0 |
+----------------------------+----------------------------+----------------------------------+

Or this deleted_1 is null or deleted_1 != '1':

mysql> select 0 is null or 0 != '1', 1 is null or 1 != '1', null is null or null != '1';
+-----------------------+-----------------------+-----------------------------+
| 0 is null or 0 != '1' | 1 is null or 1 != '1' | null is null or null != '1' |
+-----------------------+-----------------------+-----------------------------+
|                     1 |                     0 |                           1 |
+-----------------------+-----------------------+-----------------------------+

It really depends on what you wanna get back.