sql语句中 加上一个负数怎么写?
扔个三星炸死你
扔个三星炸死你 2017-02-27 15:53:45
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$sql ="update lzh_cds_items set ci_fetch_num = ci_fetch_num+(-20)";

这么写对吗


扔个三星炸死你
扔个三星炸死你

reply all(1)
巴扎黑

……加负值,不就是减吗???

$sql ="update lzh_cds_items set ci_fetch_num = ci_fetch_num-20";


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