条件在蜂巢中的顺序是否重要？

编程问答 2022-06-11

问题描述

查询的结果不同，唯一的不同是where条件的顺序。 可能是因为源表出了点问题。


SELECT *
FROM source
WHERE ((submission <> 'Y' or submission is NULL) and payment >0.01)
OR (submission='Y' and payment_2 > 0.01);

Result 1:
+----------+-------------+-------------+------------+----------+
|   Name   |    entry    | submission  | payment_2  | payment  |
+------------------------------+-------------+-----------------+
| abc      | 1           | NULL        | 0.0        | 790.5    |
+----------+-------------+-------------+------------+----------+

Query 2:

SELECT *
FROM source
WHERE (submission='Y' and payment_2 > 0.01)
OR ((submission <> 'Y' or submission is NULL) and payment >0.01);

Result 2:
+----------+-------------+-------------+------------+----------+
|   Name   |    entry    | submission  | payment_2  | payment  |
+------------------------------+-------------+-----------------+
+----------+-------------+-------------+------------+----------+```

解决方法

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