How do you declare a variable in PL SQL?

How do you declare a variable in PL SQL?

After the declaration, PL/SQL allocates memory for the variable’s value and the storage location is identified by the variable name. Syntax for declaring variable: Following is the syntax for declaring variable: variable_name [CONSTANT] datatype [NOT NULL] [:= | DEFAULT initial_value]

Can you declare a constant variable in PL SQL?

As the name implies a constant is a value used in a PL/SQL Block that remains unchanged throughout the program. You can declare a constant and use it instead of actual value.

How do you declare and assign value to a variable in Oracle?

In oracle we cannot directly set the value to a variable, we can only assign a value to a variable between the Begin and End blocks. Assigning the values to variables can be done as direct input (:=) or using select into clause. SELECT ‘OUTPUT SAM FROM OUTPUTER2’ INTO OUTPUTER2 FROM DUAL; DBMS_OUTPUT.

What is declare in Oracle?

Declarations allocate storage for a value, specify its datatype, and specify a name that you can reference. Declarations can also assign an initial value and impose the NOT NULL constraint.

How do you declare a constant in SQL?

A constant is a value used in a PL/SQL block that remains unchanged throughout the program….Example of PL/SQL constant

  2. — constant declaration.
  3. pi constant number := 3.141592654;
  4. — other declarations.
  5. radius number(5,2);
  6. dia number(5,2);
  7. circumference number(7, 2);
  8. area number (10, 2);

How do I add a constant value in SQL?

You can add static value when you use INSERT INTO SELECT MySQL query. Write the value directly in the select statement or you can add with the help of variable which initializes the value. SET @yourVariableName − = yourstaticValue; INSERT INTO yourSecondTableName(yourColumnName1,yourColumnName2,….

What is a variable in SQL?

A Transact-SQL local variable is an object that can hold a single data value of a specific type. Variables in batches and scripts are typically used: To save a data value to be returned by a stored procedure return code or function return value.

To create a variable, you declare it in the DECLARE section of the PL/SQL block. Declaring a variable allocates storage space for the value it contains, specifies its data type, and sets up a reference to the value. Once a variable has been declared it is eligible to be assigned a value.

What is PL SQL statement?

PL/SQL is a Procedural language which is an extension of SQL, and it holds the SQL statements within its syntax. The basic difference between SQL and PL/SQL is that in SQL a single query gets executed at a time whereas, in PL/SQL a whole block of code get executed at a time.

What are SQL variables?

A variable in SQL is an object that can hold a single data value of a specific type. In contrast, a parameter in SQL is an object that can exchange data between stored procedures and functions. These definitions explain the fundamental difference between variable and parameter in SQL.