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how to extract hour from DATE datatype?

222529May 18 2007 — edited May 18 2007
Hi,

I have a table that has a DATE column.
If I select this column, it show its date and time .
If I try to extract hour from this data, the following message is shown:

ORA-30076: invalid extract field for extract source

Why it shows time (hour, minute, second,..) and i cannot extract nothing from there?
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Locked on Jun 15 2007
Added on May 18 2007
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