Inserting Data into Hive Table

Question

I am new to hive  I have successfully setup a single node hadoop cluster for development purpose and on top of it  I have installed hive and pig   I created a dummy table in hive   create table foo  id int  name string     Now  I want to insert data into this table  Can I add data just like sql one record at a time  kindly help me with an analogous command to   insert into foo  id  name  VALUES  12  xyz     Also  I have a csv file which contains data in the format   1 name1 2 name2             1000 name1000   How can I load this data into the dummy table

User · Answer

Hadoop file system does not support appending data to the existing files  Although  you can load your CSV file into HDFS and tell Hive to treat it as an external table

User · Answer

There s no direct way to insert 1 record at a time from the terminal  however  here s an easy straight forward workaround which I usually use when I want to test something   Assuming that t is a table with at least 1 record  It doesn t matter what is the type or number of columns   INSERT INTO TABLE foo SELECT  12    xyz  FROM t LIMIT 1

User · Answer

this is supported from version hive 0 14   INSERT INTO TABLE pd temp dept make cost id asmb city asmb ct retail  VALUES  production   thailand  10 99202  northcarolina   usa  20

User · Answer

It s a limitation of hive   1 You cannot update data after it is inserted  2 There is no  insert into table values       statement  3 You can only load data using bulk load  4 There is not  delete from   command  5 You can only do bulk delete  But you still want to insert record from hive console than you can do select from statck  refer this

User · Answer

What ever data you have inserted into one text file or log file that can put on one path in hdfs and then write a query as follows in hive    hive gt load data inpath lt  lt specify inputpath gt  gt  into table  lt  lt tablename gt  gt     EXAMPLE   hive gt create table foo  id int  name string  row format delimited fields terminated by   t  or    or     stored as text file  table created       DATA INSERTION       hive gt load data inpath   home hive foodata log  into table foo

User · Answer

You can use following lines of code to insert values into an already existing table  Here the table is db name table name having two columns  and I am inserting  All   done  as a row in the table   insert into table db name table name select  ALL   Done     Hope this was helpful

User · Answer

I think the best way is   a  Copy data into HDFS  if it is not already there   b  Create external table over your CSV like this  CREATE EXTERNAL TABLE TableName  id int  name string  ROW FORMAT DELIMITED    FIELDS TERMINATED BY      LINES TERMINATED BY   n  STORED AS TEXTFILE LOCATION  place in HDFS     c  You can start using TableName already by issuing queries to it   d  if you want to insert data into other Hive table    insert overwrite table finalTable select   from table name

User · Answer

to insert ad-hoc value like  12  xyz   do this   insert into table foo select   from  select 12  xyz  a

User · Answer

Use this -  create table dummy table name as select   from source table name    This will create the new table with existing data available on source table name

User · Answer

Hive apparently supports INSERT   VALUES starting in Hive 0 14   Please see the section  Inserting into tables from SQL  at  https   cwiki apache org confluence display Hive LanguageManual DML

User · Answer

You may try this  I have developed a tool to generate hive scripts from a csv file  Following are few examples on how files are generated   Tool -- https   sourceforge net projects csvtohive  source directory   Select a CSV file using Browse and set hadoop root directory ex   user bigdataproject  Tool Generates Hadoop script with all csv files and following is a sample of  generated Hadoop script to insert csv into Hadoop     bin bash -v hadoop fs -put   AllstarFull csv  user bigdataproject AllstarFull csv hive -f   AllstarFull hive  hadoop fs -put   Appearances csv  user bigdataproject Appearances csv hive -f   Appearances hive  hadoop fs -put   AwardsManagers csv  user bigdataproject AwardsManagers csv hive -f   AwardsManagers hive Sample of generated Hive scripts  CREATE DATABASE IF NOT EXISTS lahman  USE lahman  CREATE TABLE AllstarFull  playerID string yearID string gameNum string gameID string teamID string lgID string GP string startingPos string  row format delimited fields terminated by     stored as textfile  LOAD DATA INPATH   user bigdataproject AllstarFull csv  OVERWRITE INTO TABLE AllstarFull  SELECT   FROM AllstarFull    Thanks Vijay

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