📝行转列介绍

Author: bebee4java

guides/行转列使用.sql

@@ -0,0 +1,45 @@
+/*
+原始数据:
+id,name,login_date
+1,bebee,2019-12-01
+2,bebee,2019-12-02
+3,jack,2019-12-03
+4,bebee,2019-12-04
+5,bebee,2019-12-05
+6,jack,2019-12-06
+7,jack,2019-12-07
+8,bebee,019-12-08
+
+目标数据:
+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
+*/
+
+-- 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(
+  id int,
+  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 name,concat_ws(',',collect_set(login_date)) as login_date
+from user_login
+group by name;
+
+
+
+
+
+