📝列转行介绍

Author: bebee4java

guides/列转行使用.sql

@@ -0,0 +1,46 @@
+/*
+原始数据:
+name,login_date
+bebee,2019-12-01|2019-12-02|2019-12-04|2019-12-05|2019-12-08
+jack,2019-12-03|2019-12-06|2019-12-07
+
+目标数据:
+name    login_date
+bebee   2019-12-01
+bebee   2019-12-02
+jack    2019-12-03
+bebee   2019-12-04
+bebee   2019-12-05
+jack    2019-12-06
+jack    2019-12-07
+bebee   2019-12-08
+
+*/
+
+-- 1. 建表
+set hive.exec.mode.local.auto=true;   --开启Hive的本地模式
+
+drop table if exists user_login;
+create temporary table user_login(
+  name string,
+  login_date string
+) row format delimited fields terminated by ','
+stored as textfile
+tblproperties(
+  "skip.header.line.count"="1"  --跳过文件首的1行
+  --"skip.footer.line.count"="n"  --跳过文件尾的n行
+);
+
+load data local inpath '/tmp/sgr/user_login.csv' into table user_login;
+
+-- 2. 处理
+select a.name,b.login_date
+from user_login a
+lateral view explode(split(login_date,'\\|')) b AS login_date
+order by b.login_date;
+
+
+
+
+
+