ORAClE sql如何实现行转列?

发布网友 发布时间：2022-04-22 20:42

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共3个回答

热心网友 时间：2022-04-07 19:00

如果“站名”、“条码”、“时间”都是一样的话，可以这么写：

with
t_temp as (select row_number() over (partition by station_name order by param_name asc) id, t.* from t),
t_temp1 as (select * from t_temp where id = 1),
t_temp2 as (select * from t_temp where id = 2),
t_temp3 as (select * from t_temp where id = 3)
select '站名' col1, '条码' col2, t_temp1.参数名 col3, t_temp2.参数名 col4, t_temp3.参数名 col5, '时间' col6
from t_temp1, t_temp2, t_temp3
where t_temp1.站名 = t_temp2.站名
and t_temp2.站名 = t_temp3.站名
union all
select t_temp1.站名, t_temp1.条码, to_char(t_temp1.数值), to_char(t_temp2.数值), to_char(t_temp3.数值), to_char(t_temp1.时间)
from t_temp1, t_temp2, t_temp3
where t_temp1.站名 = t_temp2.站名
and t_temp2.站名 = t_temp3.站名

热心网友 时间：2022-04-07 20:18

如果“站名”、“条码”、“时间”都是一样的话，可以这么写：

with
t_temp as (select row_number() over (partition by station_name order by param_name asc) id, t.* from t),
t_temp1 as (select * from t_temp where id = 1),
t_temp2 as (select * from t_temp where id = 2),
t_temp3 as (select * from t_temp where id = 3)
select '站名' col1, '条码' col2, t_temp1.参数名 col3, t_temp2.参数名 col4, t_temp3.参数名 col5, '时间' col6
from t_temp1, t_temp2, t_temp3
where t_temp1.站名 = t_temp2.站名
and t_temp2.站名 = t_temp3.站名
union all
select t_temp1.站名, t_temp1.条码, to_char(t_temp1.数值), to_char(t_temp2.数值), to_char(t_temp3.数值), to_char(t_temp1.时间)
from t_temp1, t_temp2, t_temp3
where t_temp1.站名 = t_temp2.站名
and t_temp2.站名 = t_temp3.站名

热心网友 时间：2022-04-07 21:53

select wm_concat(参数名) name from tablename group by 条码;