小编hab*_*abi的帖子

如何在同一列上连接来自同一表的不同条件的两个结果集?

select * from unit_of_measure;
+--------+-----------+--------+------------+--------------+-----------------+-------------+---------------+------------------+
| uom_id | uom_name  | symbol | created_by | created_date | created_ip_addr | modified_by | modified_date | modified_ip_addr |
+--------+-----------+--------+------------+--------------+-----------------+-------------+---------------+------------------+
|      1 | number    | NULL   | NULL       | NULL         | NULL            | NULL        | NULL          | NULL             |
|      2 | kilograms | NULL   | NULL       | NULL         | NULL            | NULL        | NULL          | NULL             |
|      3 | liters    | NULL   | NULL       | NULL         | NULL            | NULL        | NULL          | …
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mysql

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