Question

WHERE NOT some condition并未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';

当前，此查询返回3579897行。

参考：

数据集中的所有时间戳记：

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

返回3579897行。

条件的时间戳记：

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（几乎）始终为真。好的，它将过滤出NULL的{{1}}个值。

或更雄辩地是：

n.uid

如果WHERE n.uid NOT IN ('12055', '2132512');是一个数字（我希望如此），则应删除单引号：

uid

SQL“ WHERE NOT某些条件”不排除条件

1 个答案: