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Nested tables can be sparse: you can delete arbitrary elements, rather than just removing an item from the end.Nested table data is stored out-of-line in a store table, a system-generated database table associated with the nested table.In this chapter, you learn how those types let you reference and manipulate collections of data as whole objects.You also learn how the datatype is an ordered group of elements, all of the same type.Ambrose Bierce Many programming techniques use collection types such as arrays, bags, lists, nested tables, sets, and trees.To support these techniques in database applications, PL/SQL provides the datatypes , which allow you to declare index-by tables, nested tables and variable-size arrays.Their index values are more flexible, because associative array subscripts can be negative, can be nonsequential, and can use string values instead of numbers when appropriate.PL/SQL automatically converts between host arrays and associative arrays that use numeric key values.

That gives you array-like access to individual rows.When stored in the database, varrays retain their ordering and subscripts.Each varray is stored as a single object, either inside the table of which it is a column (if the varray is less than 4KB) or outside the table but still in the same tablespace (if the varray is greater than 4KB).You can define collection types in a procedure, function, or package.You can pass collection variables as parameters, to move data between client-side applications and stored subprograms.

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