- AS OF queries consider only those rows that are in effect as of a given point in time.
- BETWEEN time1 AND time2 queries consider only rows with durations that overlap or immediately succeed a given time period.
- FROM time1 TO time2 queries are similar to BETWEEN...AND queries, but they do not include rows where the duration succeeds but does not overlap the given time period.
- CONTAINED IN(time1, time2) queries qualify rows with durations that lie within the specified time period.
SELECT Customer_ID, Policy_type FROM Policy FOR VALIDTIME AS OF DATE’2009-11-24’; Customer_ID Policy_Type ----------- ----------- 246824626 AU
Temporal DELETE and UPDATE modifications can include a FOR PORTION OF qualifier that specifies when during the duration of a row a change or deletion is in effect, so such changes need not apply to the whole row in an all-or-nothing fashion.
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|Period data types and derived period columns||