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What is the use of collections in Oracle?

by Rhyley Bryan

What is the use of collections in Oracle?

Many programming techniques use collection types such as arrays, bags, lists, nested tables, sets, and trees. You can model these types in database applications using the PL/SQL datatypes TABLE and VARRAY , which allow you to declare nested tables, associative arrays, and variable-size arrays.

What are the different types of collections in Oracle?

5.10.1 DELETE Collection Method.

  • 5.10.2 TRIM Collection Method.
  • 5.10.3 EXTEND Collection Method.
  • 5.10.4 EXISTS Collection Method.
  • 5.10.5 FIRST and LAST Collection Methods.
  • 5.10.6 COUNT Collection Method.
  • 5.10.7 LIMIT Collection Method.
  • 5.10.8 PRIOR and NEXT Collection Methods.

    • How do you assign a value to a collection in Oracle?

    Assigning Collections

    1. One collection can be assigned to another by an INSERT , UPDATE , FETCH , or SELECT statement, an assignment statement, or a subprogram call.
    2. You can use operators such as SET , MULTISET UNION , MULTISET INTERSECT , and MULTISET EXCEPT to transform nested tables as part of an assignment statement.

    What do you call collection in Oracle Database?

    A homogeneous single dimension data structure which is made up of elements of same datatype is called collection in Oracle Database. In simple language we can say that, an array in Oracle Database is called Collection.

    How to create a collection in Oracle PL / SQL?

    FIRST – Returns the index of the first element in the collection. LAST – Returns the index of the last element in the collection. PRIOR (n) – Returns the index of the element prior to the specified element. NEXT (n) – Returns the index of the next element after the specified element. EXTEND – Appends a single null element to the collection.

    What are the characteristics of collections in PL / SQL?

    In this chapter, we will discuss the Collections in PL/SQL. A collection is an ordered group of elements having the same data type. Each element is identified by a unique subscript that represents its position in the collection. Oracle documentation provides the following characteristics for each type of collections −

    What is the definition of a collection in Java?

    A Collection is an ordered group of elements of particular data types. It can be a collection of simple data type or complex data type (like user-defined or record types). In the collection, each element is identified by a term called “subscript.” Each item in the collection is assigned with a unique subscript.