MySQL查询没什么

Question

This is the MySQL query I am running:

SELECT * 
    FROM wp_social_stuff_events 
    WHERE `user_1_id` = 63 
        OR `user_1_id` = 143 
        OR `user_2_id` = 63 
        OR `user_2_id` = 143 
    ORDER BY `event_timestamp` DESC LIMIT 100

How would I use that query but say I don't want any results where "user_1_id" is 53? I tried using AND user_1_id NOT 53 at the end but I can't seem to get that to work either (not sure if it is the correct way)?

Any ideas?

Answer 1

SELECT * 
FROM wp_social_stuff_events 
WHERE (`user_1_id` = 63 
OR `user_1_id` = 143 
OR `user_2_id` = 63 
OR `user_2_id` = 143)
AND user_1_id <> 53
ORDER BY `event_timestamp` DESC LIMIT 100

You can use != or <> for not equal as you can read in the MySql documentation . It's also require to have parentheses because AND is executed before OR. See MySql Operator Precedent .

Answer 2

AND user_1_id <> 53

也会一样（不同于）。

Answer 3

You need:

`user_1_id` <> 53

<> is the not equal operator in MySQL

See here:

http://dev.mysql.com/doc/refman/5.0/en/comparison-operators.html#operator_not-equal

Answer 4

SELECT * 
    FROM wp_social_stuff_events 
    WHERE `user_1_id` = 63 
        OR `user_1_id` = 143 
        OR ((`user_2_id` = 63 OR `user_2_id` = 143) 
         AND `user_1_id` <> 53) 
    ORDER BY `event_timestamp` DESC LIMIT 100