php - 根据主题类型将 mysql 行提取到表中

Question

这是我的表格示例(为了清晰起见，重新格式化)

  Subject   Percentage  Grade
  English     40%       D
  Chemistry   80%       A
  Physics     50%       C

所以，基本上我想获取这些数据并以这种方式表示它:

  English   Chemistry    Physics
  40%           80%        50%
  D              A          C

我该怎么做？谢谢。

Answer 1

试试这个:

    select english , chemistry , physics from (


    select (select percentage from Table1 where subject = 'English' ) as english,
           (select percentage from Table1 where subject = 'Chemistry') as chemistry,
           (select percentage from Table1 where subject = 'Physics') as physics

    from Table1 group by english
    union all

    select (select Grade from Table1 where subject = 'English' ) as english,
           (select Grade from Table1 where subject = 'Chemistry') as chemistry,
           (select Grade from Table1 where subject = 'Physics') as physics

    from Table1 group by english
     ) t

输出:

 ENGLISH    CHEMISTRY   PHYSICS
  40%          80%        50%
   D            A          C

DEMO HERE