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Temporal Expressions

Temporal values include dates, times, and date/time values that have both a date and time. More  specialized temporal types are timestamp (commonly used for recording “current date and time”) and year  (for temporal values that require a resolution only to year units). Direct use of temporal values in expressions occurs primarily in comparison operations, or in arithmetic  operations that add an interval to or subtract an interval from a temporal value. Otherwise, most temporal  value operations are performed by using functions. Temporal data may be generated via any of the following means: 􀂃 Copying data from an existing date, datetime, or time column 􀂃 Executing a built-in function that returns a date, datetime, or time column 􀂃 Building a string representation of the temporal data to be evaluated by the server Date Components: Type                       Default Format DATE                        YYYY-MM-DD TIME                          HH:MM:SS DATETIME