How does Oracle define variables and assign values?

In Oracle, you can use DECLARE and SET statements to define variables and assign values.

Firstly, use the DECLARE statement to declare the name and data type of a variable. For example, to declare a variable named var_name, you can use the following syntax:

Create a variable named var_name with a specific data type.

Next, use the SET statement to assign a value to a variable. For example, to assign the value of 10 to a variable named var_name, you can use the following syntax:

Assign the value of 10 to the variable var_name.

Here is a complete example:

DECLARE
var_name is a NUMBER;
BEGIN
var_name := 10;
DBMS_OUTPUT.PUT_LINE(‘Variable value: ‘ || var_name);
END;

In the above example, a variable named var_name is declared and assigned a value of 10 using the SET statement. Then, within the code block written between BEGIN and END, the value of the variable is printed using the DBMS_OUTPUT.PUT_LINE statement.

Please be aware that the above examples are PL/SQL code, which can be executed in an Oracle database using PL/SQL development tools such as SQL Developer or PL/SQL Developer.