**Oracle Dates and Times - Stanford University**
http://infolab.stanford.edu/~ullman/fcdb/oracle/or-time.html

Operations on DATE You can compare DATE values using the standard comparison operators such as =, !=, >, etc.. You can subtract two DATE values, and the result is a FLOAT which is the number of days between the two DATE values. In general, the result may contain a fraction because DATE also has a time component. For obvious reasons, adding, multiplying, and dividing two DATE values are not ...

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