lua中关于table值的处理问题

Question

表A记录如下:

A 1

A 2

B 1

B 2

如何根据表A生成新表B:

A 1 2

B 1 2

Answer 1

没太听明白呀,是不是这样 select sum(case when b.name in ('a_1','a_2') then 1 else 0) as a, sum(case when b.name in ('b_1',...