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https://www.tutorialspoint.com/plsql/plsql_arrays.htm
In this chapter, we will discuss arrays in PL/SQL. The PL/SQL programming language provides a data structure called the VARRAY, which can store a fixed-size sequential collection of elements of the same type. A varray is used to store an ordered collection of data, however it is often better to think of an array as a collection of variables of the same type.
https://www.ibm.com/support/knowledgecenter/en/SS6NHC/com.ibm.swg.im.dashdb.apdv.plsql.doc/doc/c0053897.html
Associative arrays (PL/SQL) A PL/SQL associative array is a collection type that associates a unique key with a value. An associative array has the following characteristics: An associative array type must be defined before array variables of that array type can be declared.
https://blogs.oracle.com/oraclemagazine/using-plsql-associative-arrays
Fortunately, ODP.NET's support for PL/SQL associative arrays can help you meet both IT mandates. ODP.NET developers can use PL/SQL as an API to the data in the database and use associative array binding to reduce network round-trips.
https://community.oracle.com/thread/67763
May 12, 2003 · Support for Array Binding and PL/SQL tables (IN, INOUT, or OUT) I have attempted, unsuccessfully, to use array binding in stored procedure/function calls where the sp/sf has parameters that are PL/SQL tables. I have seen the topic floating around in this forum, but I have not seen the explicit questions:
https://community.oracle.com/thread/182973
May 23, 2003 · 1. Re: Array of Records in PL/SQL 155651 May 23, 2003 4:39 AM (in response to 321894) You can make use of user defined objects in Oracle 8 onwards. You can create either table of objects or varray of objects.
http://www.dba-oracle.com/t_oracle_associative_arrays.htm
ASSOCIATIVE ARRAYS can only exist in PL/SQL memory structures. The advantage of ASSOCIATIVE ARRAYS over nested tables and VARRAYs is that an ASSOCIATIVE ARRAY does not need to be extended to add elements. Also, an ASSOCIATIVE ARRAY doesn't have to be initialized. Best of all, ASSOCIATIVE ARRAY elements are added in any order and any position in the ASSOCIATIVE ARRAY.
https://docs.oracle.com/database/121/TTPLS/dtypesfunc.htm
In PL/SQL, array types are known as varrays (variable size arrays), set types are known as nested tables, and hash table types are known as associative arrays or index-by tables. These are all collection types.
https://docs.oracle.com/cd/A97630_01/appdev.920/a96624/05_colls.htm
PL/SQL automatically converts between host arrays and associative arrays that use numeric key values. The most efficient way to pass collections to and from the database server is to use anonymous PL/SQL blocks to bulk-bind input and output host arrays to associative arrays.
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