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MYSQL中字符串字段转成数字字段使用

2010-06-09 18:30:43| 分类：笔记 | 标签： |举报 |字号大中小订阅

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OA系统用户管理有个额外管理部门的字段dept_id_other，是TEXT型记录着其他部门的ID号，要把它和原来的数值型字段DEPT_ID连接起来使用，虽然看起来好简单，但实现起来却费了我半个多小时才找出办法：

把字符串字段加个数值，利用mysql本身的功能将其转发为数值型输出，看来不能忽视这些入门课中提到的小技巧啊！

select dept_id,dept_name from department where dept_id in (
select dept_id from user where user_id='xxx'
union
select (dept_id_other+0) as dept_id from user where user_id='xxx'
)

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