hadoop - Insert overwrite partition in Hive table - Values getting duplicated -

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i created hive table non-partition table , using select query inserted data partitioned hive table.

refered site

  1. by following above link partition table contains duplicate values. below setps

this sample employee dataset:link1

i tried following queries: link2

but after updating value in hive table,

updating salary of steven employeeid 19 50000.

insert overwrite table unm_parti_trail partition (department = 'a') select employeeid,firstname,designation, case when employeeid=19 50000 else salary end salary unm_parti_trail;

the values getting duplicated.

7       nirmal  tech    12000   7       nirmal  tech    12000   b

nirmal placed in department a duplicated department b.

am doing wrong?

please suggest.

it seems forgot clause in last insert overwrite: 

insert table unm_parti_trail partition (department = 'a')  select employeeid,firstname,designation, case when employeeid=19  50000 else salary end salary unm_parti_trail  department = 'a';

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