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This chapter introduces you to the concept of sequence, creation of sequence, viewing the sequence, and dropping them.
Introduction
A sequence is a software function that generates integer numbers in either ascending or descending order, within a definite range, to generate primary key and coordinate other keys among the table. You use sequence for availing integer numbers say, for employee_id or transaction_id. A sequence can support SMALLINT, BIGINT, INTEGER, and DECIMAL data types. A sequence can be shared among multiple applications. A sequence is incremented or decremented irrespective of transactions.
A sequence is created by CREATE SEQUENCE statement.
Types of Sequences
There are two type of sequences available:
Parameters of sequences
The following parameters are used for sequences:
Data type: This is the data type of the returned incremented value. (SMALLINT, BIGINT, INTEGER, NUMBER, DOUBLE)
START WITH: The reference value, with which the sequence starts.
MINVALUE: A minimum value for a sequence to start with.
MAXVALUE: A maximum value for a sequence.
INCREMENT BY: step value by which a sequence is incremented.
Sequence cycling: the CYCLE clause causes generation of the sequence repeatedly. The sequence generation is conducted by referring the returned value, which is stored into the database by previous sequence generation.
Creating a sequence
You can create sequence using the following syntax:
Syntax:
Example: [To create a new sequence with the name âsales1_seqâ and increasing values from 1]
Viewing the sequences
You can view a sequence using the syntax given below:
Syntax:
Example: [To see list of previous updated value in sequence âsales1_seqâ]
Output:
Dropping the sequence
To remove the sequence, you need to use the âDROP SEQUENCE â command. Here is how you do it:
Syntax:
Example: [To drop sequence âsales1_seqâ from database]
Output:
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