f499a1c0_quences_in_Oracle__autonumber___Description
[Parameter] CYCLE [Example] CYCLE [Description] 
Specify CYCLE to indicate that the sequence continues to generate values after reaching either its maximum or minimum value. After an ascending sequence reaches its maximum value, it generates its minimum value. After a descending sequence reaches its minimum, it generates its maximum.
How to use sequences in Oracle (autonumber)
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