SQL行转列与列转行详情
作者：Python学习与数据挖掘
1.数据集
+---+----------+ |id |login_date| +---+----------+ |01 |2021-02-28| |01 |2021-03-01| |01 |2021-03-02| |01 |2021-03-04| |01 |2021-03-05| |01 |2021-03-06| |01 |2021-03-08| |02 |2021-03-01| |02 |2021-03-02| |02 |2021-03-03| |02 |2021-03-06| |03 |2021-03-06| +---+----------+
以"连续登录"中的数据为例：
select id,
concat_ws(',',collect_list(login_date)) cw
from data
group by id;结果：
+---+----------------------------------------------------------------------------+
|id |cw |
+---+----------------------------------------------------------------------------+
|01 |2018-02-28,2018-03-01,2018-03-02,2018-03-04,2018-03-05,2018-03-06,2018-03-08|
|02 |2018-03-01,2018-03-02,2018-03-03,2018-03-06 |
|03 |2018-03-06 |
+---+----------------------------------------------------------------------------+
以上面SQL生成的数据为基准，执行下列SQL：
select id, login_date from t lateral view explode(split(cw,',')) b AS login_date;
结果：
+---+----------+
|id |login_date|
+---+----------+
|01 |2018-02-28|
|01 |2018-03-01|
|01 |2018-03-02|
|01 |2018-03-04|
|01 |2018-03-05|
|01 |2018-03-06|
|01 |2018-03-08|
|02 |2018-03-01|
|02 |2018-03-02|
|02 |2018-03-03|
|02 |2018-03-06|
|03 |2018-03-06|
+---+----------+
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