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SQL的有关问题

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Release： 2016-06-13 13:28:32
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SQL的问题
我mysql 这3个字段都在一个表中 有一个字段rd的值 是字段out的值减去字段pv的值 这个rd字段怎么弄

------解决方案--------------------

SQL code
update tt set rd=`out`-`pv`; <div class="clear">
                 
              
              
        
            </div>
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