SQL Declare code example

Example 1: sql declare variable

-- Declare the variable to be used.
DECLARE @MyCounter int;

-- Initialize the variable.
SET @MyCounter = 0;

Example 2: how to declare a variable in sql

DECLARE @COURSE_ID AS INT, @COURSE_NAME VARCHAR (10);

Example 3: declare value in sql

DECLARE  { @LOCAL_VARIABLE[AS] data_type  [ = value ] }

Example 4: what does declare do in sql

-- MySQL

DECLARE variable_name datatype(size) [DEFAULT default_value];
-- Declaring a variable without specifying a default value will result it
-- in being a null value.
-- Declare is what allows us to create a variable

Example 5: local variables in sql

Local variables:
These variables can be used or exist 
only inside the function. These variables
are not used or referred by any other function.

Global variables:
These variables are the variables which
can be accessed throughout the program.
Global variables cannot be created
whenever that function is called.