What is PL SQL collections?
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.
How do you initialize a collection in PL SQL?
To create collections, you define a collection type, then declare variables of that type. You can define TABLE and VARRAY types in the declarative part of any PL/SQL block, subprogram, or package. Collections follow the same scoping and instantiation rules as other types and variables.
Is PL SQL record a collection type?
A record is a collection of data objects that are kept in fields, each having its own name and datatype. A record can be thought of as a variable that can store a table row or a set of columns from a table row.
What is Varray in PL SQL example?
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.
How do you handle exceptions in PL SQL?
PL/SQL allows you to define your own exceptions according to the need of your program. A user-defined exception must be declared and then raised explicitly, using either a RAISE statement or the procedure DBMS_STANDARD. RAISE_APPLICATION_ERROR.
What is the difference between record and collection in Oracle?
In a collection, the internal components always have the same data type, and are called elements. … To create a collection variable, you either define a collection type and then create a variable of that type or use %TYPE . In a record, the internal components can have different data types, and are called fields.
How do you extend a collection in Oracle?
Syntax of EXTEND method in Oracle PL/SQL
- collection_name – the name of the collection.
- EXTEND – adds one zero element to the collection.
- EXTEND (n) – adds n zero elements to the collection.
- EXTEND (n, i) – adds n copies of the i-th element to the collection.
Can we create multi dimensional collection in PL SQL?
Description PL/SQL doesn’t offer native support for multi-dimensional arrays, as you will find in other programming languages. You can, however, emulate these structures using nested collections.
What is bulk collection in Oracle PL SQL?
A bulk collect is a method of fetching data where the PL/SQL engine tells the SQL engine to collect many rows at once and place them in a collection. The SQL engine retrieves all the rows and loads them into the collection and switches back to the PL/SQL engine. … The data can now be processed as needed in memory.
What are the datatypes available in PL SQL?
Data types (PL/SQL)
|PL/SQL data type||DB2® SQL data type||Description|
|INT||INT||Signed four-byte integer numeric data|
|INTEGER||INTEGER||Signed four-byte integer numeric data|
|LONG||CLOB (32760)||Character large object data|
|LONG RAW||BLOB (32760)||Binary large object data|
How do you declare a record in PL SQL block?
Syntax for declaration at subprogram level:
DECLARE TYPE <type_name> IS RECORD ( <columnl> <datatype>, ); BEGIN <execution_section>; END; In the syntax, we are creating the record type named “type_name” only inside the subprogram. In both declaration method, the way of defining the column and data type is similar.
What is record type in PL SQL?
A record type is a composite data type that consists of one or more identifiers and their corresponding data types. You can create user-defined record types by using the TYPE IS RECORD statement within a package or by using the CREATE TYPE (Object) statement.
Which data type is not allowed in the definition of PL SQL record?
View Answer. A Collection datatype is not allowed in the definition of PL/SQL record.