免费做图素材网站有哪些,自己做发卡网站,工作总结开头,阜新网站制作文章目录1. 向管理表中装载数据2. 通过查询语句向表中插入数据3. 动态分区插入4. 从单个查询语句创建表并加载数据5. 导出数据学习自《Hive编程指南》 1. 向管理表中装载数据 hive (default) load data local inpath /home/hadoop/workspace/student.txt… 文章目录1. 向管理表中装载数据2. 通过查询语句向表中插入数据3. 动态分区插入4. 从单个查询语句创建表并加载数据5. 导出数据学习自《Hive编程指南》 1. 向管理表中装载数据 hive (default) load data local inpath /home/hadoop/workspace/student.txt overwrite into table student1;分区表可以跟 partition (key1 v1, key2 v2, …) 有 local 复制本地路径文件 到 hdfs 无 local移动 hdfs 文件 到 新的 hdfs 路径 overwrite 目标文件夹中的数据将会被删除 没有 overwrite 把新增加的文件添加到目标文件夹中不删除原数据 inpath 后的路径下不能包含任何文件夹 2. 通过查询语句向表中插入数据 hadoopdblab-VirtualBox:~/workspace$ cat stu.txt 1 michael male china 2 ming male china1 3 haha female china 4 huahua female china1创建表加载数据 hive (default) create table stu( id int, name string, sex string, country string) row format delimited fields terminated by \t;hive (default) load data local inpath /home/hadoop/workspace/stu.txt into table stu;通过 select 语句向其他表填入数据 hive (default) create table employee( name string, country string) row format delimited fields terminated by \t;hive (default) from stu s insert overwrite table employee select s.name, s.country where s.id%21; WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases. Query ID hadoop_20210408224138_1df23614-7945-40c0-9a4d-df88e4f58ea1 Total jobs 3 Launching Job 1 out of 3 Number of reduce tasks is set to 0 since theres no reduce operator Job running in-process (local Hadoop) 2021-04-08 22:41:40,081 Stage-1 map 100%, reduce 0% Ended Job job_local1437521177_0001 Stage-4 is selected by condition resolver. Stage-3 is filtered out by condition resolver. Stage-5 is filtered out by condition resolver. Moving data to directory hdfs://localhost:9000/user/hive/warehouse/employee/.hive-staging_hive_2021-04-08_22-41-38_345_1863326332876590299-1/-ext-10000 Loading data to table default.employee MapReduce Jobs Launched: Stage-Stage-1: HDFS Read: 83 HDFS Write: 180 SUCCESS Total MapReduce CPU Time Spent: 0 msechive (default) select * from employee; OK michael china haha china向多表插入数据 hive (default) from stu s insert into table employee select s.name, s.country where s.sexfemale insert into table employee1 select s.name, s.country where s.sexmale; WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases. Query ID hadoop_20210408230623_bc69bccf-348e-467d-b88e-498664f27017 Total jobs 5 Launching Job 1 out of 5 Number of reduce tasks is set to 0 since theres no reduce operator Job running in-process (local Hadoop) 2021-04-08 23:06:24,405 Stage-2 map 100%, reduce 0% Ended Job job_local2065691620_0003 Stage-5 is selected by condition resolver. Stage-4 is filtered out by condition resolver. Stage-6 is filtered out by condition resolver. Stage-11 is selected by condition resolver. Stage-10 is filtered out by condition resolver. Stage-12 is filtered out by condition resolver. Moving data to directory hdfs://localhost:9000/user/hive/warehouse/employee/.hive-staging_hive_2021-04-08_23-06-23_001_7974131043339100692-1/-ext-10000 Moving data to directory hdfs://localhost:9000/user/hive/warehouse/employee1/.hive-staging_hive_2021-04-08_23-06-23_001_7974131043339100692-1/-ext-10002 Loading data to table default.employee Loading data to table default.employee1 MapReduce Jobs Launched: Stage-Stage-2: HDFS Read: 470 HDFS Write: 474 SUCCESS Total MapReduce CPU Time Spent: 0 msechive (default) select * from employee; ming china1 huahua china1 haha china huahua china1hive (default) select * from employee1; michael china ming china13. 动态分区插入 hive (default) from stu s insert overwrite table employee2 partition (country, sex) select s.id, s.name, s.country, s.sex;hive (default) select * from employee2; OK 3 haha china female 1 michael china male 4 huahua china1 female 2 ming china1 male4. 从单个查询语句创建表并加载数据 表的模式由 select 生成 hive (default) create table employee3 as select id, name from stu where countrychina;hive (default) select * from employee3; 1 michael 3 haha此功能不能用于外部表数据没有装载在外部 5. 导出数据 hive (default) from stu s insert overwrite local directory /tmp/employee select s.id, s.name, s.sex where countrychina;可以同时写入多个文件insert 重复写几次 hive (default) ! ls /tmp/employee -r; 000000_0hive (default) ! cat /tmp/employee/000000_0; 1michaelmale 3hahafemale