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发现mysql一个用法，比较有用

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Release： 2016-06-07 18:00:12
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mysql下用select实现列运算

代码如下:
select ABS(a.self_score-b.assess_score) val
form emp_assess a
inner jion emp_assess_score b on a.emp_assess_id=b.emp_assess_id limit 0,10

Related labels：
mysql select
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