How do you initialize a variable in a table?

Contents

1 How do you initialize a variable in a table?
2 How do you initialize a variable in PL SQL?
- 2.1 How initialize Varray in PL SQL?
- 2.2 How do you declare a variable of a table in PL SQL?
  - 2.2.1 Which of the following operator is used to initialize the variables in PL SQL?
  - 2.2.2 How do you comment out a line in PL SQL?
3 What is Varray in PL SQL?
4 What is collection in Oracle PL SQL?
- 4.1 How to create a table in PL / SQL?
- 4.2 How do you declare an object in PL / SQL?
  - 4.2.1 How are uninitialized objects treated in PL / SQL?

How do you initialize a variable in a table?

I have such simple procedure and TYPETEST table type. create or replace PROCEDURE TESTPROCEDURE (dayName out TYPETEST )IS BEGIN dayName(1):=’Monday’; dayname(2):=’1′; dayname(3):=’good’; END TESTPROCEDURE; CREATE OR REPLACE TYPE TYPETEST AS TABLE OF varchar2(50);

How do you initialize a variable in PL SQL?

Initializing Variables in PL/SQL counter binary_integer := 0; greetings varchar2(20) DEFAULT ‘Have a Good Day’; You can also specify that a variable should not have a NULL value using the NOT NULL constraint. If you use the NOT NULL constraint, you must explicitly assign an initial value for that variable.

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.

How initialize Varray in PL SQL?

You can initialize the varray elements using the constructor method of the varray type, which has the same name as the varray. Varrays are one-dimensional arrays. A varray is automatically NULL when it is declared and must be initialized before its elements can be referenced.

How do you declare a variable of a table in PL SQL?

Declare TABLE TYPE variables in a PL/SQL declare block. Table variables are also known as index-by table or array. The table variable contains one column which must be a scalar or record datatype plus a primary key of type BINARY_INTEGER.

What is Rowtype in PL SQL?

The %ROWTYPE attribute is used to define a record with fields corresponding to all of the columns that are fetched from a cursor or cursor variable. Each field assumes the data type of its corresponding column. The %ROWTYPE attribute is prefixed by a cursor name or a cursor variable name.

Which of the following operator is used to initialize the variables in PL SQL?

PL/SQL allows you to set a default value for a variable at the declaration time. To assign a default value to a variable, you use the assignment operator ( := ) or the DEFAULT keyword. In this example, instead of using the assignment operator := , we used the DEFAULT keyword to initialize a variable.

How do you comment out a line in PL SQL?

PL/SQL supports two comment styles: single-line and multi-line. A double hyphen ( – – ) anywhere on a line (except within a character literal) turns the rest of the line into a comment. Multi-line comments begin with a slash-asterisk ( /* ) and end with an asterisk-slash ( */ ).

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 Varray in PL SQL?

Description The varray (variable size array) is one of the three types of collections in PL/SQL (associative array, nested table, varray). The varray’s key distinguishing feature is that when you declare a varray type, you specify the maximum number of elements that can be defined in the varray.

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.

What is use of %type in Plsql?

The %TYPE attribute, used in PL/SQL variable and parameter declarations, is supported by the data server. Use of this attribute ensures that type compatibility between table columns and PL/SQL variables is maintained. If the data type of the column or variable changes, there is no need to modify the declaration code.

How to create a table in PL / SQL?

To create PL/SQL tables, you take two steps. First, you define a TABLE type, then declare PL/SQL tables of that type. You can define TABLE types in the declarative part of any block, subprogram, or package using the syntax TYPE table_type_name IS TABLE OF datatype [NOT NULL] INDEX BY BINARY_INTEGER;

How do you declare an object in PL / SQL?

In PL/SQL, you then declare a variable whose data type is the user-defined type or ADT that you just defined. Objects or ADTs follow the usual scope and instantiation rules. You can define object types using CREATE TYPE .

How to declare and initialize an object in SQL?

You can use objects or ADTs wherever built-in types such as CHAR or NUMBER can be used. Declare objects in the same way you declare built-in types. Example 3-2 declares object emp of type employee_typ. Then, the constructor for object type employee_typ initializes the object.

How are uninitialized objects treated in PL / SQL?

3.1.3 How PL/SQL Treats Uninitialized Objects User-defined types, just like collections, are atomically null, until you initialize the object by calling the constructor for its object type. That is, the object itself is null, not just its attributes. Comparing a null object with any other object always yields NULL.

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