Updating long data type
These subscripts give you array-like access to individual rows.
A nested table differs from an array in these important ways: .
If character set differences mean that two keys that were unique are not unique on the remote database, the program raises a Conceptually, a nested table is like a one-dimensional array with an arbitrary number of elements.
Within the database, a nested table is a column type that holds a set of values.
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.
This chapter explains how to create and use PL/SQL collection and record variables.
However, this might be impractical for large numbers of elements.When you declare an associative array that is indexed by strings, the string type in the declaration must be When you pass an associative array as a parameter to a remote database using a database link, the two databases can have different globalization settings.When the remote database uses a collection method such as , it uses its own character order, which might be different from the order where the collection originated.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.