sql - postgresql 两个 NOT LIKE 子句返回错误结果

Question

我有一个包含 88 个代码的表格。我正在编写一个简单的选择语句，它不选择以 10 或 18

开头的代码

select distinct pcl_mun from exemptions.modiv_parcels_2015 
where (pcl_mun NOT LIKE '10%') or (pcl_mun NOT LIKE '18%')
order by pcl_mun

有人会认为这行得通，但它会返回所有结果

"0233"
"0242"
"1001"
"1002"
"1003"
"1004"
"1005"
"1006"
"1012"
"1013"
"1014"
"1015"
"1018"
"1019"
"1020"
"1024"
"1025"
"1401"
"1402"
"1403"
"1406"
"1407"
"1408"
"1409"
"1412"
"1413"
"1414"
"1415"
"1418"
"1419"
"1420"
"1421"
"1422"
"1423"
"1424"
"1425"
"1426"
"1427"
"1428"
"1429"
"1431"
"1432"
"1433"
"1434"
"1435"
"1436"
"1437"
"1438"
"1439"
"1601"
"1609"
"1611"
"1613"
"1615"
"1801"
"1802"
"1803"
"1807"
"1815"
"1904"
"1906"
"1908"
"1909"
"1911"
"1912"
"1916"
"1918"
"1919"
"1922"
"2101"
"2102"
"2103"
"2105"
"2106"
"2107"
"2108"
"2110"
"2111"
"2112"
"2114"
"2115"
"2116"
"2117"
"2119"
"2120"
"2121"
"2122"
"2123"

如果我单独运行每一个类似的子句，它们都会返回正确的结果。我在这里做错了什么？

Answer 1

当组合 NOT LIKE 时，应使用 AND 而不是 OR

select distinct pcl_mun 
from exemptions.modiv_parcels_2015 
where pcl_mun NOT LIKE '10%' 
  AND pcl_mun NOT LIKE '18%'
order by pcl_mun

这是合乎逻辑的事情，但有时会令人困惑。

简化示例:

('18' NOT LIKE '10%') OR ('18' NOT LIKE '18%')  --> true OR false --> true
('18' NOT LIKE '10%') AND ('18' NOT LIKE '18%')  --> true AND false --> FALSE

('14' NOT LIKE '10%') OR ('14' NOT LIKE '18%')  --> true OR true --> TRUE
('14' NOT LIKE '10%') AND ('14' NOT LIKE '18%')  --> true AND true --> TRUE

因为在否定LIKE的组合时是不同的。
然后应该使用 OR 代替。

NOT ('18' LIKE '10%' OR '18' LIKE '18%')  --> NOT(false OR true) --> FALSE
NOT ('18' LIKE '10%' AND '18' LIKE '18%')  --> NOT(false AND true) --> true

NOT ('14' LIKE '10%' OR '14' LIKE '18%')  --> NOT(false OR false) --> TRUE
NOT ('14' LIKE '10%' AND '14' LIKE '18%')  --> NOT(false AND false) --> TRUE