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This results in a "gap" in the assigned sequence values.This can be useful when you need to create a unique number to act as a primary key. The first sequence number that it would use is 1 and each subsequent number would increment by 1 (ie: 2,3,4,...}. If you omit the MAXVALUE option, your sequence will automatically default to: Now that you've created a sequence object to simulate an autonumber field, we'll cover how to retrieve a value from this sequence object.To retrieve the next value in the sequence order, you need to use option specifies how many sequence values will be stored in memory for faster access.In other words, a sequence can be used to generate primary key values for multiple tables, and the sequence continues even if it is being applied to a different table.Hello Oracle Gurus, I have two databases which both get refreshed from an external Data Warehouse. The problem that I have is that one of the major tables in these databases have different sequence numbers for one of the primary keys.If you need to change its value, you should re-create the sequence.On the other hand, we can use a trick to change the value of a sequence without recreating it.The Oracle NEXTVAL function must be called before calling the CURRVAL function, or an error will be thrown.No current value exists for the sequence until the Oracle NEXVAL function has been called at least once.Let’s say we have a sequence and its value is 1000, and we want to set it to 500.CREATE SEQUENCE gokhan.sample_seq START WITH 1000; SELECT last_number FROM user_sequences WHERE sequence_name = 'SAMPLE_SEQ'; LAST_NUMBER ----------- 1000 ALTER SEQUENCE gokhan.sample_seq INCREMENT BY -500; SELECT gokhan.sample_seq.However, my approach will obviously invalidate all dependencies which commonly refer to triggers.The trick is to change the INCREMENT BY value to the difference between the current value and the needed value, then use it once, finally switch the INCREMENT BY back to 1.SEQUENCE And NEXTVAL Oracle uses the concept of SEQUENCE to create numerical primary key values as we add rows of data into a table.Whereas numerical primary key population for My SQL and SQL Server is tied to individual tables, in Oracle the SEQUENCE construct is created separately and is not tied to an individual table.

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