SQL 'WHERE NOT some condition' 不排除条件

Question

WHERE NOT some condition不从我的查询中排除该条件。

代码:

SELECT 
    n.timestamp AS tm
FROM 
    (SELECT timestamp, uid 
     FROM nodes 
     UNION ALL 
     SELECT timestamp, uid FROM ways) n
WHERE 
    NOT n.uid = '12055' OR NOT n.uid = '2132512';

目前，此查询返回 3579897 行。

引用:

数据集中的所有时间戳:

SELECT n.timestamp as tm
FROM (SELECT timestamp FROM nodes UNION ALL SELECT timestamp FROM ways) n;

返回 3579897 行。

条件的时间戳:

SELECT n.timestamp as tm
FROM (SELECT timestamp, uid FROM nodes UNION ALL SELECT timestamp, uid FROM ways) n
WHERE n.uid='12055' OR n.uid='2132512'

返回 2254097 行。

Answer 1

我想你想要:

WHERE NOT n.uid = '12055' AND NOT n.uid = '2132512';

您的版本将返回所有行 - 一个或其他条件将(几乎)始终为真。好的，它会过滤掉NULL n.uid 的值.

或者更 Eloquent 地说:

WHERE n.uid NOT IN ('12055', '2132512');

如果 uid是一个数字(我期望)，那么你应该去掉单引号:

WHERE n.uid NOT IN (12055, 2132512);