数据库行列转换

[一]、行转列

select t.TOWN_ID as TOWN_ID,
  sum(decode(t.STATE, '筹建', t.COUNT1,0)) as STATE1, 
  sum(decode(t.STATE, '临时', t.COUNT1,0)) as STATE2, 
  sum(decode(t.STATE, '正常', t.COUNT1,0)) as STATE3
from (select TOWN_ID,STATE,count(*) COUNT1 from TAX_INFO group by TOWN_ID,STATE order by TOWN_ID,STATE) t 
group by t.TOWN_ID

结果如下

[二]、列转行

select TOWN_ID, '筹建' STATE, STATE1 as COUNT from HY_STATE
union 
select TOWN_ID, '临时' STATE, STATE2 as COUNT from HY_STATE
union 
select TOWN_ID, '正常' STATE, STATE3 as COUNT from HY_STATE

结果如下