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How to Safely Perform Data Type Conversion in an Oracle Table

Posted on 2011-03-17
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Last Modified: 2012-05-11
Dear experts,

We are using Oracle 11 Database and we have more than a dozen of "very large" tables. All the tables have a field (column) with Time Stamp (3) type. How can we convert these fields to DATE type  in a safe way without recreating table?

Note: The truncation of the Time Stamp field (seconds fraction etc.) is not important. Year, Month, Date, Hour, Minutes are enough.

BR,

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Question by:GurcanK
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qasim_md earned 250 total points
ID: 35155706
1) you have to update your table with the UPDATE statement to eliminate the seconds fractions:
UPDATE TABLE1
SET date_column = convert(datetime,date_column)

2) After the table data is updated and the seconds fraction is removed ALTER the table column to the Datatype you want.

did that help ? let me know...
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