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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.Using the same key with a different value changes the value.Example 5-1 declares an associative array that is indexed by a string, populates it, and prints it.These subscripts give you array-like access to individual rows.A nested table differs from an array in these important ways: .An associative array is intended for temporary data storage.
If you must change these settings during your session, set them back to their original values before performing further operations on associative arrays that are indexed by strings.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.For examples, see Using Multidimensional Collections. Topics: An associative array (also called an index-by table) is a set of key-value pairs.Each key is unique, and is used to locate the corresponding value. Using a key-value pair for the first time adds that pair to the associative array.
An associative array cannot be stored in the database.