sql 列转换成行

表的数据如下：

我想用sql语句查询出的结果是这样：

 

sql语句如下：

select c_e_Num,sum(case c_cw_Num when 'cw1' then c_Number else '' end) as cw1,

sum(case c_cw_Num when 'cw2' then c_Number else '' end) as cw2,

sum(case c_cw_Num when 'cw3' then c_Number else '' end) as cw3,

sum(case c_cw_Num when 'cw4' then c_Number else '' end) as cw4,

sum(case c_cw_Num when 'cw5' then c_Number else '' end) as cw5

from tb_cworkcount GROUP BY c_e_Num

运行效果如下：