Mysql sql合并chenge以选择案例

我有两个表，想从两个有条件的表中得到行和 结果是这样的，例如sh2:19+5+11+5=40对于每个名称，在一个表中计算它们 我用那个密码

select name, sum(total) total from 
(select name, sum(coalesce(sk,ss)) total
 from table1
 group by name
 union all
 select name, sum(coalesce(sk,ss)) total
 from table2
 group by name
) t
group by name

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但是我想使用select和case作为代码

您使用的是MySQL还是MS SQL Server？不要标记未涉及的产品。添加示例表数据和预期结果-以及格式良好的文本。@jarlh您好，请帮我一次tnx，这里是示例数据

select name,SUM(total)total from(
      select name,sum(case when sk>0 then sk else ss end )total from majale group by name
      union all
      select name,sum(case when sk>0 then sk else ss end )from ketab group by name
      union all
      select name,sum(case when sk>0 then sk else ss end )from savabegh group by name
      )t
      group by name