根据上一行增加一行

Question

This is my table

id / step    / piece / tube / Validate / tool / tool2 / tool3 / index
__________________________________________________________________
1 / step3    /4113292/ ezpz / ok       /616255/222233/222231  / 0
2 / step6    /4113292/ ezpz /          /333255/212393/922231  / 0
3 / step2    /3322234/ PZEZ /          /321938/330200/3O32O   / 0
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 0

I want to increment the index when I add a new step(with an insert) who has the same tube and piece.

for exemple:

id / step    / piece / tube / Validate / tool / tool2 / tool3 / index
__________________________________________________________________
1 / step3    /4113292/ ezpz / ok       /616255/222233/222231  / 1
2 / step6    /4113292/ ezpz /          /333255/212393/922231  / 2
3 / step2    /3322234/ PZEZ /          /321938/330200/3O32O   / 1
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 3

and if I add a new step for piece 4113292 and tube ezpz I want this :

id / step    / piece / tube / Validate / tool / tool2 / tool3 / index
__________________________________________________________________
1 / step3    /4113292/ ezpz / ok       /616255/222233/222231  / 1
2 / step6    /4113292/ ezpz /          /333255/212393/922231  / 2
3 / step2    /3322234/ PZEZ /          /321938/330200/3O32O   / 1
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 3
5 / step7    /4113292/ ezpz /          /616255/902233/8243231 / 4

or if I add a new step for the piece 3322234

id / step    / piece / tube / Validate / tool / tool2 / tool3 / index
__________________________________________________________________
1 / step3    /4113292/ ezpz / ok       /616255/222233/222231  / 1
2 / step6    /4113292/ ezpz /          /333255/212393/922231  / 2
3 / step2    /3322234/ PZEZ /          /321938/330200/3O32O   / 1
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 3
5 / step1    /3322234/ PZEZ /          /432938/330200/3O32O   / 2

i do that cause when a step is ok I want to go to the next step

Answer 1

Example insert from user - instead a "?" put "0" as default value, because every first insert will be 0.

INSERT INTO operation (step, piece, tube, tool,tool2,3,index) VALUES (step3, 4113292, ezpz,616255,902233,8243231, 0);

When you do an insert again with same piece and tube, this trigger should do the job.

DELIMITER //
CREATE TRIGGER yourTrigger
BEFORE INSERT
   ON yourTable FOR EACH ROW
BEGIN
    DECLARE maxIndex INT DEFAULT -1;
    SELECT MAX(index1) m
        FROM yourTable
        WHERE piece = NEW.piece
            AND tube = NEW.tube
        INTO maxIndex;
    IF maxIndex >= 0 THEN
        SET NEW.index1 = maxIndex + 1;
    END IF;
END;//
DELIMITER;

Tested in SQL Fiddle .

PS I had to rename "index" to "index1" because SQL Fiddle doesn't work with column named "index".

Answer 2

create a "data_event" table like this :

id / step    / piece / tube / Validate / tool / tool2 / tool3 / index
_____________________________________________________________________
1 / step3    /4113292/ ezpz / ok       /616255/222233/222231  / 1    
2 / step6    /4113292/ ezpz /          /333255/212393/922231  / 1    
2 / step6    /4113292/ ezpz /          /333255/212393/922231  / 1    
3 / step2    /3322234/ PZEZ /          /321938/330200/3O32O   / 1    
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 1    
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 1    
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 1    
5 / step1    /3322234/ PZEZ /          /432938/330200/3O32O   / 1    
5 / step1    /3322234/ PZEZ /          /432938/330200/3O32O   / 1    

Use this table "table_event" for insert (or delete) data (always with index=1)

create view data_aggregate as
select
    id,step,piece,tube,Validate,tool,tool2,tool3,sum(index) as index
from
    data_event
group by
    id,step,piece,tube,Validate,tool,tool2,tool3

id / step    / piece / tube / Validate / tool / tool2 / tool3 / index 
______________________________________________________________________
1 / step3    /4113292/ ezpz / ok       /616255/222233/222231  / 1     
2 / step6    /4113292/ ezpz /          /333255/212393/922231  / 2     
3 / step2    /3322234/ PZEZ /          /321938/330200/3O32O   / 1     
4 / step4    /4113292/ ezpz /          /616255/902233/8243231 / 3
5 / step1    /3322234/ PZEZ /          /432938/330200/3O32O   / 2

Use this table for select

Sometimes (may be every day, every hour...) you can replace the content of table_event by the result of the view (using a transaction and an intermediate table) to compress storage