我有一个包含 3 列(A、B、C)的表格.我想从表中选择一些行,然后 MySQL 返回单行,其中每列都添加了值...
I have a table with 3 columns (A,B,C). I want to select some rows from the table and then the MySQL to return a single row having the values added on each column...
A B C
1. 2 2 2
2. 4 4 4
3. 6 7 8
在这种情况下,如果我选择所有三行,MySql 应该返回:
MySql should return in this case, if I select all the three rows:
A B C
1. 12 13 14
select sum(A),sum(B),sum(C) from mytable where id in (1,2,3);
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