sqlite实现行列转换
最近用sqlite做统计，要实现行列转换。
行是：
要达到的效果是：
使用的语句是：
行转成列：
SELECT zldwdm,sum(mj) as total,sum(CASE WHEN dlbm='01' THEN mj ELSE 0 END) AS '01',
sum(CASE WHEN dlbm='02' THEN mj ELSE 0 END) AS '02',
sum(CASE WHEN dlbm='03' THEN mj ELSE 0 END) AS '03',
sum(CASE WHEN dlbm='04' THEN mj ELSE 0 END) AS '04',
sum(CASE WHEN dlbm='20' THEN mj ELSE 0 END) AS '20',
sum(CASE WHEN dlbm='10' THEN mj ELSE 0 END) AS '10',
sum(CASE WHEN dlbm='11' THEN mj ELSE 0 END) AS '11',
sum(CASE WHEN dlbm='12' THEN mj ELSE 0 END) AS '12'
FROM (select substr(zl_dm,1,12) as zldwdm,substr(dl_bm,1,2) as dlbm,sum(gqmj) as mj from LMS_TJPC_NORMAL
group by substr(zl_dm,1,12),substr(dl_bm,1,2))
GROUP BY zldwdm
再看一个更复杂的语句
SELECT b.xzqmc,a.zldwdm,
sum(CASE WHEN substr(dlbm,1,2)='01' THEN mj ELSE 0 END) AS '01',
sum(CASE WHEN substr(dlbm,1,3)='011' THEN mj ELSE 0 END) AS '011',
sum(CASE WHEN substr(dlbm,1,3)='012' THEN mj ELSE 0 END) AS '012',
sum(CASE WHEN substr(dlbm,1,3)='013' THEN mj ELSE 0 END) AS '013',
sum(CASE WHEN substr(dlbm,1,2)='02' THEN mj ELSE 0 END) AS '02',
sum(CASE WHEN substr(dlbm,1,3)='021' THEN mj ELSE 0 END) AS '021',
sum(CASE WHEN substr(dlbm,1,3)='022' THEN mj ELSE 0 END) AS '022',
sum(CASE WHEN substr(dlbm,1,3)='023' THEN mj ELSE 0 END) AS '023',
sum(CASE WHEN substr(dlbm,1,2)='03' THEN mj ELSE 0 END) AS '03',
sum(CASE WHEN substr(dlbm,1,3)='031' THEN mj ELSE 0 END) AS '031',
sum(CASE WHEN substr(dlbm,1,3)='032' THEN mj ELSE 0 END) AS '032',
sum(CASE WHEN substr(dlbm,1,3)='033' THEN mj ELSE 0 END) AS '033',
sum(CASE WHEN substr(dlbm,1,2)='04' THEN mj ELSE 0 END) AS '04',
sum(CASE WHEN substr(dlbm,1,3)='041' THEN mj ELSE 0 END) AS '041',
sum(CASE WHEN substr(dlbm,1,3)='042' THEN mj ELSE 0 END) AS '042',
sum(CASE WHEN substr(dlbm,1,3)='043' THEN mj ELSE 0 END) AS '043',
sum(CASE WHEN substr(dlbm,1,2)='20' THEN mj ELSE 0 END) AS '20',
sum(CASE WHEN substr(dlbm,1,3)='201' THEN mj ELSE 0 END) AS '201',
sum(CASE WHEN substr(dlbm,1,3)='202' THEN mj ELSE 0 END) AS '202',
sum(CASE WHEN substr(dlbm,1,3)='203' THEN mj ELSE 0 END) AS '203',
sum(CASE WHEN substr(dlbm,1,3)='204' THEN mj ELSE 0 END) AS '204',
sum(CASE WHEN substr(dlbm,1,3)='205' THEN mj ELSE 0 END) AS '205',
sum(CASE WHEN substr(dlbm,1,2)='10' THEN mj ELSE 0 END) AS '10',
sum(CASE WHEN substr(dlbm,1,3)='101' THEN mj ELSE 0 END) AS '101',
sum(CASE WHEN substr(dlbm,1,3)='102' THEN mj ELSE 0 END) AS '102',
sum(CASE WHEN substr(dlbm,1,3)='104' THEN mj ELSE 0 END) AS '104',
sum(CASE WHEN substr(dlbm,1,3)='105' THEN mj ELSE 0 END) AS '105',
sum(CASE WHEN substr(dlbm,1,3)='106' THEN mj ELSE 0 END) AS '106',
sum(CASE WHEN substr(dlbm,1,3)='107' THEN mj ELSE 0 END) AS '107',
sum(CASE WHEN substr(dlbm,1,2)='11' THEN mj ELSE 0 END) AS '11',
sum(CASE WHEN substr(dlbm,1,3)='111' THEN mj ELSE 0 END) AS '111',
sum(CASE WHEN substr(dlbm,1,3)='112' THEN mj ELSE 0 END) AS '112',
sum(CASE WHEN substr(dlbm,1,3)='113' THEN mj ELSE 0 END) AS '113',
sum(CASE WHEN substr(dlbm,1,3)='114' THEN mj ELSE 0 END) AS '114',
sum(CASE WHEN substr(dlbm,1,3)='115' THEN mj ELSE 0 END) AS '115',
sum(CASE WHEN substr(dlbm,1,3)='116' THEN mj ELSE 0 END) AS '116',
sum(CASE WHEN substr(dlbm,1,3)='117' THEN mj ELSE 0 END) AS '117',
sum(CASE WHEN substr(dlbm,1,3)='118' THEN mj ELSE 0 END) AS '118',
sum(CASE WHEN substr(dlbm,1,3)='119' THEN mj ELSE 0 END) AS '119',
sum(CASE WHEN substr(dlbm,1,2)='12' THEN mj ELSE 0 END) AS '12',
sum(CASE WHEN substr(dlbm,1,3)='122' THEN mj ELSE 0 END) AS '122',
sum(CASE WHEN substr(dlbm,1,3)='123' THEN mj ELSE 0 END) AS '123',
sum(CASE WHEN substr(dlbm,1,3)='124' THEN mj ELSE 0 END) AS '124',
sum(CASE WHEN substr(dlbm,1,3)='125' THEN mj ELSE 0 END) AS '125',
sum(CASE WHEN substr(dlbm,1,3)='126' THEN mj ELSE 0 END) AS '126',
sum(CASE WHEN substr(dlbm,1,3)='127' THEN mj ELSE 0 END) AS '127'
FROM (select substr(zl_dm,1,12) as zldwdm,substr(dl_bm,1,3) as dlbm,sum(gqmj) as mj from LMS_TJPC_NORMAL
group by substr(zl_dm,1,12),substr(dl_bm,1,3)) a,xzq b where a.zldwdm=b.xzqdm
GROUP BY a.zldwdm
再看一个例子：
SELECT b.xzqmc,a.zldwdm,sum(a.mj) as total,
sum(CASE WHEN QSXZ='G' THEN mj ELSE 0 END) AS 'Gtotal',
sum(CASE WHEN QSXZ='J' THEN mj ELSE 0 END) AS 'Jtotal',
sum(CASE WHEN dlbm='01' THEN mj ELSE 0 END) AS '01',
sum(CASE WHEN dlbm='01' and QSXZ='G' THEN mj ELSE 0 END) AS 'G01',
sum(CASE WHEN dlbm='01' and QSXZ='J' THEN mj ELSE 0 END) AS 'J01',
sum(CASE WHEN dlbm='02' THEN mj ELSE 0 END) AS '02',
sum(CASE WHEN dlbm='02' and QSXZ='G' THEN mj ELSE 0 END) AS 'G02',
sum(CASE WHEN dlbm='02' and QSXZ='J' THEN mj ELSE 0 END) AS 'J02',
sum(CASE WHEN dlbm='03' THEN mj ELSE 0 END) AS '03',
sum(CASE WHEN dlbm='03' and QSXZ='G' THEN mj ELSE 0 END) AS 'G03',
sum(CASE WHEN dlbm='03' and QSXZ='J' THEN mj ELSE 0 END) AS 'J03',
sum(CASE WHEN dlbm='04' THEN mj ELSE 0 END) AS '04',
sum(CASE WHEN dlbm='04' and QSXZ='G' THEN mj ELSE 0 END) AS 'G04',
sum(CASE WHEN dlbm='04' and QSXZ='J' THEN mj ELSE 0 END) AS 'J04',
sum(CASE WHEN dlbm='20' THEN mj ELSE 0 END) AS '20',
sum(CASE WHEN dlbm='20' and QSXZ='G' THEN mj ELSE 0 END) AS 'G20',
sum(CASE WHEN dlbm='20' and QSXZ='J' THEN mj ELSE 0 END) AS 'J20',
sum(CASE WHEN dlbm='10' THEN mj ELSE 0 END) AS '10',
sum(CASE WHEN dlbm='10' and QSXZ='G' THEN mj ELSE 0 END) AS 'G10',
sum(CASE WHEN dlbm='10' and QSXZ='J' THEN mj ELSE 0 END) AS 'J10',
sum(CASE WHEN dlbm='11' THEN mj ELSE 0 END) AS '11',
sum(CASE WHEN dlbm='11' and QSXZ='G' THEN mj ELSE 0 END) AS 'G11',
sum(CASE WHEN dlbm='11' and QSXZ='J' THEN mj ELSE 0 END) AS 'J11',
sum(CASE WHEN dlbm='12' THEN mj ELSE 0 END) AS '12',
sum(CASE WHEN dlbm='12' and QSXZ='G' THEN mj ELSE 0 END) AS 'G12',
sum(CASE WHEN dlbm='12' and QSXZ='J' THEN mj ELSE 0 END) AS 'J12'
FROM (select substr(zl_dm,1,12) as zldwdm ,substr(dl_bm,1,2) as DLBM,
case when qs_xz < '30' then 'G' else 'J' end as QSXZ,sum(gqmj) as mj
from LMS_TJPC_NORMAL
group by substr(zl_dm,1,12),substr(dl_bm,1,2),
case when qs_xz < '30' then 'G' else 'J' end) a,xzq b
where a.zldwdm=b.xzqdm GROUP BY a.zldwdm
由此可见sqlite也有类似于Oracle的decode（建议在oracle里也用case when then这样的句子，便于不同数据库移植）