SELECT Site, Category,
IF(Month=1,Cost,0) as M1,
IF(Month=2,Cost,0) as M2,
IF(Month=3,Cost,0) as M3,
IF(Month=4,Cost,0) as M4,
IF(Month=5,Cost,0) as M5,
IF(Month=6,Cost,0) as M6,
IF(Month=7,Cost,0) as M7,
IF(Month=8,Cost,0) as M8,
IF(Month=9,Cost,0) as M9,
IF(Month=10,Cost,0) as M10,
IF(Month=11,Cost,0) as M11,
IF(Month=12,Cost,0) as M12
FROM tablename
会逐行给出。GROUP BY
如果你想要每行,你可以添加一个Category
SELECT Site, Category,
SUM(IF(Month=1,Cost,0)) as M1,
SUM(IF(Month=2,Cost,0)) as M2,
SUM(IF(Month=3,Cost,0)) as M3,
SUM(IF(Month=4,Cost,0)) as M4,
SUM(IF(Month=5,Cost,0)) as M5,
SUM(IF(Month=6,Cost,0)) as M6,
SUM(IF(Month=7,Cost,0)) as M7,
SUM(IF(Month=8,Cost,0)) as M8,
SUM(IF(Month=9,Cost,0)) as M9,
SUM(IF(Month=10,Cost,0)) as M10,
SUM(IF(Month=11,Cost,0)) as M11,
SUM(IF(Month=12,Cost,0)) as M12
FROM tablename
GROUP BY Site, Category
将保留站点,但总结类别。
此外,如果您不喜欢该字段的 Mx 名称,您可以尝试使用 '1' .. '2' 等。我认为它应该可以工作