SQL-将行作为同一表中的列

Question

我有此表，REGAL值为1-8，每个REGAL都有POLICE A-E，每个POLICE都有RADA 1-40。我想创建select，按REGAL和POLICE分组，以及许多新列1-40（按RADA值），这些列具有按WHERE CONDITION的值（因此，新列1的值为UMISTENI，其中RADA = 1）。第二张图片是我想要得到的结果。我怎样才能做到这一点？谢谢

编辑： 该脚本未返回正确的值

    SELECT REGAL, POLICE, RADA, 
CASE WHEN RADA=1 THEN UMISTENI END AS "01",
CASE WHEN RADA=2 THEN UMISTENI END AS "02",
CASE WHEN RADA=3 THEN UMISTENI END AS "03",
CASE WHEN RADA=4 THEN UMISTENI END AS "04"
FROM `ciselnik_sklad_regal_police_rada`
GROUP BY REGAL, POLICE

Answer 1

这是我的解决方案：

SELECT REGAL, POLICE, RADA, 
MAX(CASE WHEN RADA=1 THEN UMISTENI END) AS "01",
MAX(CASE WHEN RADA=2 THEN UMISTENI END) AS "02",
....
FROM `table`
GROUP BY REGAL, POLICE