如果所有三個字段均為“是”，則SQL隱藏結果

Question

我有一個包含4個字段的MySQL數據庫：

id | planchanged | dataremoved | rolloverenabled |
1  | Yes         | Yes         | Yes             |
2  | NULL        |             |                 |
3  |             | Yes         |                 |
4  | Yes         |             | Yes             |
5  |             |             | NULL            |

如何查詢此數據庫，以僅顯示在這三個字段上沒有全部“是”的記錄。 另請注意，某些字段可能為Null 。 因此，基於該示例，我的結果應顯示記錄2、3、4和5。

Answer 1

你可以這樣做

SELECT * FROM TableName 
WHERE coalesce(planchanged,'-') <> 'Yes' OR 
coalesce(dataremoved,'-') <> 'Yes' OR
coalesce(rolloverenabled,'-') <>'Yes'

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Answer 2

SELECT * 
FROM yourTableName 
WHERE planchanged IS NULL OR planchanged <> 'Yes' 
OR dataremoved IS NULL OR dataremoved <> 'Yes' 
OR rolloverenabled IS NULL OR rolloverenabled <> 'Yes'

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Answer 3

SELECT * 
FROM  yourTableName 
WHERE planchanged IS NULL 
  OR  dataremoved IS NULL 
  OR  rolloverenabled IS NULL 
  OR  planchanged <> 'Yes' 
  OR  dataremoved <> 'Yes' 
  OR  rolloverenabled <> 'Yes'