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    <pre><code>INSERT OVERWRITE TABLE _tableName_ PARTITION (_partitionColumn_= _partitionValue_) SELECT [other Things], CASE WHEN id=206 THEN 'florida' ELSE location END AS location, [other Other Things] FROM _tableName_ WHERE [_whereClause_]; </code></pre> <p>You can have multiple partitions listed by separating them by commas. <code>... PARTITION (_partitionColumn_= _partitionValue1_, _partitionColumn_= _partitionValue2_, ...)</code>. I haven't done this with multiple partitions, just one at a time, so I'd check the results on a test/dev env before doing all partitions at once. I had other reasons for limiting each <code>OVERWRITE</code> to a single partition as well.</p> <p>This page <a href="https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DML">https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DML</a> has a little more on it.<br> This site <a href="https://cwiki.apache.org/confluence/display/Hive/LanguageManual">https://cwiki.apache.org/confluence/display/Hive/LanguageManual</a>, in general, is your best friend when working with HiveSQL.</p> <p>I've developed something identical to this to migrate some data and it's worked. I haven't tried it against large datasets, only a few GB and it has worked perfectly.</p> <p>To Note - This will <strong>OVERWRITE</strong> the partition. It will make previous files go bye-bye. Create backup and restore scripts/procedures. The <code>[other Things]</code> and <code>[other Other Things]</code> are the rest of the columns from the table. They need to be in the correct order. This is very important or else your data will be corrupted.</p> <p>Hope this helps. :)</p>
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    1. COHi Nija, It works but i didn't used the partition.Just with the help of CASE itself UPDATE can be achieved.Thanks once again!
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    2. CO@Jothi: Yea - I didn't know if you had partitions or not, I use them, so I included them. Glad it helped. Don't forget to upvote and mark as answered answers that help.
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    3. COHi,when i referred to the link got that partition column has a corresponding input column from the select statement. so from your query is that Location a partition column.Need some more clarification on partitionColumn_= _partitionValue.Thanks!
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