带有双头的MySQL / PHP数据透视表

Question

我有这个MySQL表

我需要像波纹管这样的数据透视表，我已经尽力在MySQL中做到这一点，但是没有运气

非常感谢在Mysql或PHP中实现此目标的任何指导

Answer 1

您可以使用条件聚合直接在MySQL中实现（至少其中一些）：

SELECT id,
       MAX(CASE WHEN subject = 'BIO' THEN t1 END) AS bio_t1,
       MAX(CASE WHEN subject = 'BIO' THEN t2 END) AS bio_t2,
       MAX(CASE WHEN subject = 'BIO' THEN final END) AS bio_final,
       MAX(CASE WHEN subject = 'MATH' THEN t1 END) AS math_t1,
       MAX(CASE WHEN subject = 'MATH' THEN t2 END) AS math_t2,
       MAX(CASE WHEN subject = 'MATH' THEN final END) AS math_final,
       SUM(t1) AS total_t1,
       SUM(t2) AS total_t2,
       SUM(final) AS total_final
FROM yourtable
GROUP BY id