Updating cursor with multiple tables

DECLARE 2 -- Associative array indexed by string: 3 4 TYPE population IS TABLE OF NUMBER -- Associative array type 5 INDEX BY VARCHAR2(64); 6 7 city_population population; -- Associative array variable 8 i VARCHAR2(64); 9 10 BEGIN 11 -- Add new elements to associative array: 12 13 city_population('Smallville') := 2000; 14 city_population('Midland') := 750000; 15 city_population('Megalopolis') := 1000000; 16 17 -- Change value associated with key 'Smallville': 18 19 city_population('Smallville') := 2001; 20 21 -- Print associative array: 22 23 i := city_population.FIRST; 24 25 WHILE i IS NOT NULL LOOP 26 DBMS_Output.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.To make an associative array persistent for the life of a database session, declare the associative array (the type and the variable of that type) in a package, and assign values to its elements in the package body.

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.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.SQL Like a database table, an associative array holds a data set of arbitrary size, and you can access its elements without knowing their positions in the array.An associative array does not need the disk space or network operations of a database table, but an associative array cannot be manipulated by SQL statements (such as ).

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