row_number() in mysql code example
Example 1: row number mysql
SELECT row_number() over ( order by firstName) RowNumberSqeuence,FirstName from rowNumberDemo
order by FirstName;
Example 2: get row number in mysql 5.5
set @row_number := 0;
SELECT
@row_number:=CASE
WHEN @customer_no = customerNumber
THEN @row_number + 1
ELSE 1
END AS num,
@customer_no:=customerNumber customerNumber,
paymentDate,
amount
FROM
payments
ORDER BY customerNumber;