add row number in mysql code example

Example 1: mysql row_number() example

SET @row_number = 0; 
SELECT 
    (@row_number:=@row_number + 1) AS num, 
    firstName, 
    lastName
FROM
    employees
ORDER BY firstName, lastName    
LIMIT 5;

Example 2: row number mysql

SELECT row_number() over ( order by firstName) RowNumberSqeuence,FirstName from rowNumberDemo
 order by FirstName;

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