设计表格MaxMin,结构如下:
里面填满了测试数据:
写测试代码:
select PlayerSID, max(case RaterName when ‘pw01‘ then MaxSign1+MinSign1+MaxSign2+MinSign2 else ‘‘ end) as ‘pw01‘, max(case RaterName when ‘pw02‘ then MaxSign1+MinSign1+MaxSign2+MinSign2 else ‘‘ end) as ‘pw02‘, max(case RaterName when ‘pw03‘ then MaxSign1+MinSign1+MaxSign2+MinSign2 else ‘‘ end) as ‘pw03‘, max(case RaterName when ‘pw04‘ then MaxSign1+MinSign1+MaxSign2+MinSign2 else ‘‘ end) as ‘pw04‘, max(case RaterName when ‘pw05‘ then MaxSign1+MinSign1+MaxSign2+MinSign2 else ‘‘ end) as ‘pw05‘ FROM MaxMin group by PlayerSID
表格数据初始为Null时,会出现异常。初始化，为空时,初始化为空字符串 ‘‘
原文：https://www.cnblogs.com/exesoft/p/13215275.html