Creating a Varray Type : Varray « Collections « Oracle PL/SQL Tutorial






  1. Oracle PL/SQL Tutorial
  2. Collections
  3. Varray
  1. A varray stores an ordered set of elements.
  2. Each element has an index associated with it.
  3. A varray has a maximum size that you can change dynamically.

You create a varray type using the SQL DDL CREATE TYPE statement.

You specify the maximum size and the type of elements stored in the varray when creating the

The basic Oracle syntax for the CREATE TYPE statement for a VARRAY type definition would be:

CREATE OR REPLACE TYPE name-of-type IS VARRAY(nn)of type

Where name-of-type is a valid attribute name, nn is the number of elements (maximum) in the array, and type is the data type of the elements of the array.

You can change the maximum size of a varray using the ALTER TYPE statement.

SQL> CREATE Or Replace TYPE addressVarray AS VARRAY(2) OF VARCHAR2(50);
  2  /

Type created.

SQL>
SQL> desc addressVarray;
 addressVarray VARRAY(2) OF VARCHAR2(50)

SQL>








26.2.Varray
26.2.1.Creating a Varray Type
26.2.2.Using VARRAYs
26.2.3.Getting Information on Varrays
26.2.4.VARRAY in action
26.2.5.Inside the loop, you are accessing array elements by their subscripts.
26.2.6.Assign value to VARRAY
26.2.7.Defining our type to be a VARRAY with 10 elements, where each element is a varying character string of up to 15 characters.
26.2.8.CREATE TABLE with a VARRAY
26.2.9.Loading a Table with a VARRAY in It: INSERT VALUEs with Constants
26.2.10.Query VARRAY column
26.2.11.Query table with VARRAY type column by column name
26.2.12.Manipulating the VARRAY with The TABLE Function
26.2.13.If aliases are used, they must be used consistently
26.2.14.Manipulating the VARRAY with The VARRAY Self-join
26.2.15.VARRAY of Cursor
26.2.16.The COUNT Function
26.2.17.LAST and COUNT give the same result for VARRAYs.
26.2.18.A procedure that uses EXISTS and LAST
26.2.19.EXISTS and LAST
26.2.20.Using PL/SQL to Create Functions to Access Elements
26.2.21.The CAST function converts an object type (such as a VARRAY) into a common type that can be queried. Oracle 10g automatically converts the VARRAY without the CAST.
26.2.22.One way to make the 'members' behave like an array is first to include the row number in the result set like this:
26.2.23.Then, the individual array element can be extracted with a WHERE filter:
26.2.24.Extracting individual members of a VARRAY may be accomplished using two other functions: THE and VALUE
26.2.25.Column_value is a built-in function/pseudo-variable that is held over from the DBMS_SQL package
26.2.26.Loop through by using the built-in NEXT, PRIOR.
26.2.27.The subscript of the last element is always equal to the size of the array.
26.2.28.Decreasing the Size of an Array