MYSQL Stored procedure, approvals and approvers - mysql

Question

Im kinda new reading stored procedure.
I was thinking if this is posible to do in store procedure in mysql.
I have sequence of approval process called step. approved column; 1 is yes 0 is no.
Basically I have Step 1 to 3..in my approval sequence.
if step 1 approved status is 0 he will be the first to approved or see the table.
if step 1 approve is 1. step 2 can now see the table.
Transaction Steps Table:
id transaction_id approver_id step approved
1 1 1 1 1
2 1 2 2 0
3 1 3 3 0
4 2 3 1 1
5 2 1 2 1
6 2 2 3 0
7 3 2 1 0
8 3 3 2 0
9 3 1 3 0
10 4 1 1 1
11 4 3 2 0
12 4 2 3 0
Example If my Approval id = 2
In My View:I can only see all those next in que approvals
id transaction_id approver_id step approved
2 1 2 2 0
6 2 2 3 0
7 3 2 1 0
pls let me know if this is possible. thank you

Answer 1

If I understand correctly, you want rows that are the first non-approved for each transaction and the approver is 2.
Try this:
select ts.*
from transactionsteps ts join
(select transaction_id, min(step) as minstep
from transactionsteps
where approved = 0
group by transaction_id
) t
on ts.transaction_id = t.transaction_id and
ts.step = t.minstep
where approver_id = 2;