Updating an oracle sequence via plsql

19-Oct-2019 00:56

Oracle defines an execution cycle to execute an SQL statement and associates a cursor with it.

The following illustration shows the execution cycle of an explicit cursor: Let’s examine each step in detail.

A SEQUENCE object is used as T-SQL built-in type which automatically generates or creates sequential numbers in certain conditions or scenarios and that sequence number can be used in multiple tables as Key of those tables. a) Creation & Increment of SEQUENCE object Lets start with Creation & Increment of SEQUENCE object: In this section, a Sequence object is created with name "Sequence1" of default type Int and default starting value i.e. Sequence can be one of the below type: tinyint - Range 0 to 255 smallint - Range -32,768 to 32,767 int - Range -2,147,483,648 to 2,147,483,647 bigint - Range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 decimal and numeric with a scale of 0 Any user-defined data type (alias type) that is based on one of the allowed types.

This Oracle tutorial explains how to use the Oracle EXISTS condition with syntax and examples.

The Oracle EXISTS condition is used in combination with a subquery and is considered "to be met" if the subquery returns at least one row.

INSERT Customer (CID, CNAME, CAGE) VALUES (NEXT VALUE FOR Sequence1, 'Amit', 22), (NEXT VALUE FOR Sequence1, 'Dheeraj', 28), (NEXT VALUE FOR Sequence1, 'Kabir', 25); -- Update the table.

UPDATE Customer SET CID = NEXT VALUE FOR Sequence1 WHERE Name = 'Amit'; -- Get next value from SEQUENCE Sequence1.

A SEQUENCE object is used as T-SQL built-in type which automatically generates or creates sequential numbers in certain conditions or scenarios and that sequence number can be used in multiple tables as Key of those tables. a) Creation & Increment of SEQUENCE object Lets start with Creation & Increment of SEQUENCE object: In this section, a Sequence object is created with name "Sequence1" of default type Int and default starting value i.e. Sequence can be one of the below type: tinyint - Range 0 to 255 smallint - Range -32,768 to 32,767 int - Range -2,147,483,648 to 2,147,483,647 bigint - Range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 decimal and numeric with a scale of 0 Any user-defined data type (alias type) that is based on one of the allowed types.

This Oracle tutorial explains how to use the Oracle EXISTS condition with syntax and examples.

The Oracle EXISTS condition is used in combination with a subquery and is considered "to be met" if the subquery returns at least one row.

INSERT Customer (CID, CNAME, CAGE) VALUES (NEXT VALUE FOR Sequence1, 'Amit', 22), (NEXT VALUE FOR Sequence1, 'Dheeraj', 28), (NEXT VALUE FOR Sequence1, 'Kabir', 25); -- Update the table.

UPDATE Customer SET CID = NEXT VALUE FOR Sequence1 WHERE Name = 'Amit'; -- Get next value from SEQUENCE Sequence1.

The sequence generator generates sequential numbers, which can help to generate unique primary keys automatically, and to coordinate keys across multiple rows or tables.