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This chapter explains how to create and use PL/SQL collection and record variables.
These composite variables have internal components that you can treat as individual variables.
You can pass composite variables to subprograms as a parameters.
To create a collection or record variable, you first define a collection or record type, and then you declare a variable of that type. A collection that is created in a PL/SQL block (with the syntax in Collection) is available only in that block.
Figure 5-2 shows a varray named Nested tables and associative arrays differ in persistence and ease of parameter passing.
A nested table can be stored in a database column; therefore, you can use a nested table to simplify SQL operations in which you join a single-column table with a larger table.
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NEXT(i); 29 END LOOP; 30 END; 31 / Population of Megalopolis is 1000000 Population of Midland is 750000 Population of Smallville is 2001 PL/SQL procedure successfully completed.A varray has a maximum size, which you specify in its type definition.A varray can contain a varying number of elements, from zero (when empty) to the maximum size.A nested table type or varray type that is created at schema level (with the CREATE TYPE Statement) is stored in the database, and you can manipulate it with SQL statements.
A collection has only one dimension, but you can model a multidimensional collection by creating a collection whose elements are also collections.
An associative array is intended for temporary data storage.
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