如何使像SQL结果枢轴

Question

如何转换它：

name sub    value
a   maths   4
b   science 5
a   history 3
c   computer1
c   english 4
b   computer5
c   history 3
a   science 8
b   maths   3

变成这样：

name    maths   science history computer    english
a          4          8      3       5         NIL
b          3          5      NIL     NIL       NIL
c          NIL       NIL     3       1          4

我已经做了这样的查询。

select @cols := group_concat(distinct replace('MAX(CASE WHEN sub = ''[val]''   then ''y'' ELSE ''n'' END) AS `[val]`', '[val]', sub))
from (select distinct sub from t) t;

set @sql = concat('select name, ', @cols,
                  ' from t group by name'
                 );

prepare st from @sql;
execute st;
deallocate prepare st;

在此代码中，我使用了y或n个值。但是我需要将其替换为特定列值的相应值