场景：比如查金额，有50W行明细，还想看一下各种费用的总金额是多少
-------查询结果最后加合计行
--select * from [tab]
--union all
--select sum(a) a,sum(b) b,sum(c) c from [tab]
SQL--查询结果最后加合计行
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Origin blog.csdn.net/Mimo_YY/article/details/120288580
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