How do you assign a value to a variable in SQL stored procedure?

How do you assign a value to a variable in SQL?

When a variable is first declared, its value is set to NULL. To assign a value to a variable, use the SET statement. This is the preferred method of assigning a value to a variable. A variable can also have a value assigned by being referenced in the select list of a SELECT statement.

How do you initialize a variable in SQL stored procedure?

Declaring a variable The DECLARE statement initializes a variable by assigning it a name and a data type. The variable name must start with the @ sign. In this example, the data type of the @model_year variable is SMALLINT . By default, when a variable is declared, its value is set to NULL .

How do you DECLARE a variable in a procedure?

Declaring variables1First, specify the name of the variable after the DECLARE keyword. The variable name must follow the naming rules of MySQL table column names.2Second, specify the data type and length of the variable. ... 3Third, assign a variable a default value using the DEFAULT option.

How do you assign a string to a variable in SQL?

SQL Declare variable string To declare a string variable, use the DECLARE keyword, then type the @variable_name and variable type: char, varchar. To assign a value to a variable, use the keyword SET.