mysql 行列转换怎么写？

create table 新表

AS

select @i:=@i+1 as NO,NO1,NO2,NO3,MYA1 as MM

from(

select NO1,NO2,'MYA1 ' as NO3,MYA1 from 表

union all

select NO1,NO2,'MYA2 ',MYA2 from 表

union all

select NO1,NO2,'MYA3 ',MYA3 from 表

union all

select NO1,NO2,'MYA4 ',MYA4 from 表

union all

select NO1,NO2,'MYA5 ',MYA5 from 表

union all

select NO1,NO2,'MYA6 ',MYA6 from 表

)a order by NO1,NO2

select * from 新表

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表名 :user

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name| course | grade

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zhangsan | Java | 70

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zhangsan | C++ | 80

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lisi| java | 90

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lisi| C#| 60

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用一条 SQL 语句得到如下形式：

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name | java | C++ | C#

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zhangsan | 70 | 80 | null

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lisi | 90 | null | 60