What are the different types of collections in Oracle?

PL/SQL has three collection types—associative array, VARRAY (variable-size array), and nested table.

What is collection in Oracle 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. PL/SQL provides three collection types − Index-by tables or Associative array. Nested table.

How can a nested table be traversed?

How can a nested table be traversed?

1. Using COUNT and LIMIT methods.
2. Using FIRST and LAST methods.
3. Using FIRST and NEXT methods.
4. Using FIRST and COUNT methods.

How can I use a collection within an Oracle SQL statement?

You can do it like this: CREATE OR REPLACE FUNCTION TESTFUNC01 RETURN VARCHAR2 AS — INT_LIST is declared globally as “TYPE INT_LIST IS TABLE OF INTEGER” MyList INT_LIST := INT_LIST(); MyName VARCHAR2(512); BEGIN MyList.

What is dense and sparse in Oracle collection?

Dense: If all the rows between the first and last are defined and given a value (including NULL) Sparse: Not defined or populated sequentially. There are gaps between defined rows. VARRAYS are always dense as we cannot delete values in between and the values can only be deleted from the end (using TRIM).

How can I see what tables a user is selected from?

To see tables owned by the currently logged-in user, you can query the user_tables view. SELECT table_name FROM user_tables ORDER BY table_name ASC; This only shows tables owned by the current user.

How do you find which schema a table belongs to in Oracle?

For a list of tables in the current schema, use the Show Tables command. For a list of views in the current schema, use the Show Views command. For a list of available schemas, use the Show Schemas command. If the table or view is in a particular schema, qualify it with the schema name.

What is materialized view in Oracle?

A materialized view is a database object that contains the results of a query. You can select data from a materialized view as you would from a table or view. In replication environments, the materialized views commonly created are primary key, rowid, object, and subquery materialized views.