How to Add Serial No in Select Statement in Mysql Join - mysql

Question

There is two table in database.
== tblOrder ==
OrderId
Customer
== tblOrderItem ==
OrderItemId
OrderId
ItemId
Qty
Price
My Query :-
SELECT o.OrderId,o.Customer,oi.ItemId,oi.Qty,oi.Price
FROM tblorder o
JOIN tblorderitem oi ON oi.OrderId=o.OrderId
Result :-
+---------+----------+--------+-----+-------+
| OrderId | Customer | ItemId | Qty | Price |
+---------+----------+--------+-----+-------+
| 1001 | john day | 501 | 1 | 10 |
| 1001 | john day | 502 | 2 | 9 |
| 1002 | amy gill | 201 | 5 | 2 |
| 1003 | hardcaur | 501 | 1 | 10 |
| 1003 | hardcaur | 509 | 2 | 5 |
| 1003 | hardcaur | 201 | 2 | 2 |
+---------+----------+--------+-----+-------+
I want to generate SNO and SNOI(Temp Serial No) in select statement so that result will be like this :-
+------+---------+----------+------+--------+-----+-------+
| SNO | OrderId | Customer | SNOI | ItemId | Qty | Price |
+------+---------+----------+------+--------+-----+-------+
| 1 | 1001 | john day | 1 | 501 | 1 | 10 |
| 1 | 1001 | john day | 2 | 502 | 2 | 9 |
| 2 | 1002 | amy gill | 1 | 201 | 5 | 2 |
| 3 | 1003 | hardcaur | 1 | 501 | 1 | 10 |
| 3 | 1003 | hardcaur | 2 | 509 | 2 | 5 |
| 3 | 1003 | hardcaur | 3 | 201 | 2 | 2 |
What will be my query?

Answer 1

You can use variables.
set #ord ='';
set #val1 =1;
set #val2 =0;
select SR_No_1, OrderId, Customer, SR_No_2, ItemId, Qty, Price
from
(
SELECT t.*,
#val1 := if(#ord=OrderId, #val1+1, 1) as SR_No_2,
#val2 := if(#ord=OrderId,#val2, #val2+1) as SR_No_1,
#ord := OrderId
FROM table1 t
) t
ORDER BY orderId asc;
Result:
+---------+---------+----------+---------+--------+-----+-------+
| SR_No_1 | OrderId | Customer | SR_No_2 | ItemId | Qty | Price |
+---------+---------+----------+---------+--------+-----+-------+
| 1 | 1001 | john day | 1 | 501 | 1 | 10 |
| 1 | 1001 | john day | 2 | 502 | 2 | 9 |
| 2 | 1002 | amy gill | 1 | 201 | 5 | 2 |
| 3 | 1003 | hardcaur | 1 | 501 | 1 | 10 |
| 3 | 1003 | hardcaur | 2 | 509 | 2 | 5 |
| 3 | 1003 | hardcaur | 3 | 201 | 2 | 2 |
+---------+---------+----------+---------+--------+-----+-------+
DEMO
P.S. Kindly note that for demonstration purpose i have inserted data to one table. you can modify the query by introducing the join between 2 tables