MySql Combinate queries - mysql

Question

I have a table with the records of different defects in a company. The table is something like this
ITMNBR Defect Reference_Designator RepairCenter
8800RTO001700 Componente / Placa abierto U1U2 FG
8800HIB001075V Componente Equivocado (NumeroParte) R53 SB
8800HIB001075V Ensamble Incorrecto (produccion) R19 SB
8800RTO000400 Componente / Placa abierto U1 SB
8800RTO003200 Componente Polaridad Inversa ZD2 SB
8800HIB001048 NO SOLDADURA T1 SB
8800HIB001048 Componente / Placa abierto U2 SB
8800HIB001048 Componente / Placa abierto U2 SB
Etc.
I want to consult only the three most repetitive defects of manufacture, I made this.
SELECT defect, COUNT(*) FROM reportefallas WHERE RepairCenter ='SB'
AND (CREADT BETWEEN NOW() - INTERVAL 7 DAY AND NOW()) #Select the Dates
AND (Defect IN ('Componente / Placa dañada X alto voltaje','Pin / Patita Quebrado','Componente / Placa Quemada','Componente Defecto Cosmetico','Falla no Duplicada','Soldadura Crackeada','Soldadura Fria','Parametros Incorrectos en la torre','Parametros Incorrectos en el dibujo','Componente dañado fisicamente','Conector mal colocado (inclinado)','Tornillo / Rondana Suelto','Pista Levantada (dañada)','Componente Ausente','Soldadura Derretida','Componente Equivocado (NumeroParte)','NO SOLDADURA','Componente/Placa no programada','Conector mal ensamblado','No se encontro problema','Tornillo / Rondana Flojo','Componente / Placa abierto','Pin Hole','Pin / Pata levantada (no Soldadura)','Componente Polaridad Inversa','Puente de Soldadura','Componente Desfasado Pad','Componente / Placa en corto','Splash de Soldadura','LEDs con VF diferente / equivocado','LEDs con VF alto','LEDs con VF bajo','Ensamble Incorrecto (produccion)','Componente posicion Equivocada (referencia)','Cable ensamblado posicion incorrecta'))
GROUP BY defect
ORDER BY COUNT(*) DES
LIMIT 3;
And I have the next result
Defect COUNT(*)
Componente/ Placa abierto 5
Componente / Placa dañada X alto voltaje 4
Componente dañado fisicamente 3
Now, I need a query from the same table where the defects are, with only the three most repetitive defects that I already obtained, this is the result that I want:
ITMNBR Defect Reference_Designator
8800ITH001700 Componente / Placa abierto F2-U1(SHORT)-U2(SHORT)
8800ITH001700 Componente / Placa abierto F2-U1(SHORT)-U2(SHORT)
8800ITH001700 Componente / Placa abierto F2-R29-R22-R19-R32-R13-U1(SHORT)-U2(SHORT)
8800ITH001700 Componente / Placa abierto F2-R29-R22-R19-R32-R13-U1(SHORT)-U2(SHORT)
8800ITH001700 Componente / Placa abierto F2
8850HZL0015EX Componente / Placa dañada X alto voltaje C6-C7
8800HIB001084 Componente / Placa dañada X alto voltaje R7-C20-MOV1
8850HIB004205 Componente / Placa dañada X alto voltaje C21-C42
8800HIB004220 Componente / Placa dañada X alto voltaje R22 SWITH-R44 SWITH
8850HIB004206 Componente dañado fisicamente C42
8850HIB004202 Componente dañado fisicamente F1
8800HIB0131EX Componente dañado fisicamente R37
I tried the code below, but it doesn’t accept the LIMIT.
SELECT ITMNBR, Defect, Reference_Designator FROM reportefallas
WHERE Defect IN (SELECT defect FROM reportefallas WHERE RepairCenter='SB'
AND(CREADT BETWEEN NOW() - INTERVAL 7 DAY AND NOW()) AND (Defect IN ('Componente / Placa dañada X alto voltaje','Pin / Patita Quebrado','Componente / Placa Quemada','Componente Defecto Cosmetico','Falla no Duplicada','Soldadura Crackeada','Soldadura Fria','Parametros Incorrectos en la torre','Parametros Incorrectos en el dibujo','Componente dañado fisicamente','Conector mal colocado (inclinado)','Tornillo / Rondana Suelto','Pista Levantada (dañada)','Componente Ausente','Soldadura Derretida','Componente Equivocado (NumeroParte)','NO SOLDADURA','Componente/Placa no programada','Conector mal ensamblado','No se encontro problema','Tornillo / Rondana Flojo','Componente / Placa abierto','Pin Hole','Pin / Pata levantada (no Soldadura)','Componente Polaridad Inversa','Puente de Soldadura','Componente Desfasado Pad','Componente / Placa en corto','Splash de Soldadura','LEDs con VF diferente / equivocado','LEDs con VF alto','LEDs con VF bajo','Ensamble Incorrecto (produccion)','Componente posicion Equivocada (referencia)','Cable ensamblado posicion incorrecta'))
GROUP BY defect
ORDER BY COUNT(*) DESC
LIMIT 3)
Does anyone have any ideas any ideas?
Sorry for the Spanglish and the bad English, I hope you can understand.

Answer 1

There are several options. Previous questions on this topic have suggested using JOIN to trim down your result set instead of IN, which would look something like this:
SELECT rf.ITMNBR, rf.Defect, rf.Reference_Designator
FROM (SELECT defect FROM reportefallas WHERE RepairCenter='SB'
AND(CREADT BETWEEN NOW() - INTERVAL 7 DAY AND NOW()) AND (Defect IN ('Componente / Placa dañada X alto voltaje','Pin / Patita Quebrado','Componente / Placa Quemada','Componente Defecto Cosmetico','Falla no Duplicada','Soldadura Crackeada','Soldadura Fria','Parametros Incorrectos en la torre','Parametros Incorrectos en el dibujo','Componente dañado fisicamente','Conector mal colocado (inclinado)','Tornillo / Rondana Suelto','Pista Levantada (dañada)','Componente Ausente','Soldadura Derretida','Componente Equivocado (NumeroParte)','NO SOLDADURA','Componente/Placa no programada','Conector mal ensamblado','No se encontro problema','Tornillo / Rondana Flojo','Componente / Placa abierto','Pin Hole','Pin / Pata levantada (no Soldadura)','Componente Polaridad Inversa','Puente de Soldadura','Componente Desfasado Pad','Componente / Placa en corto','Splash de Soldadura','LEDs con VF diferente / equivocado','LEDs con VF alto','LEDs con VF bajo','Ensamble Incorrecto (produccion)','Componente posicion Equivocada (referencia)','Cable ensamblado posicion incorrecta'))
GROUP BY defect
ORDER BY COUNT(*) DESC #Ordena de manera descendente
LIMIT 3) AS subquery
JOIN
reportefallas AS rf USING (Defect)
Alternatively, you could create a separate table to track the three most common defects, and periodically update that table (e.g. via a cron job). Then you would SELECT ... WHERE Defect IN this other table.
Either of these methods could provide better performance, depending on the situation. If you try one and have poor performance, try the other and see if it's an improvement.
(For that matter, you could also store that enormous list of defects in another table, to make your query cleaner.)

Answer 2

just like AirThomas said you can use a subquery.. you should also be able to do a simple select inside your IN() instead of listing out each one individually. this is another way to do the subquery though
SELECT rf.ITMNBR, rf.Defect, rf.Reference_Designator
FROM(
SELECT ITMNBR as itm_number, defect, COUNT(*) as top_three FROM reportefallas WHERE RepairCenter ='SB'
AND (CREADT BETWEEN NOW() - INTERVAL 7 DAY AND NOW()) -- Select the Dates
AND (Defect IN (SELECT defect from reportefallas))
GROUP BY defect
ORDER BY top_three DES
LIMIT 3
)as t
JOIN reportefallas rf ON rf.ITMNBR = t.itm_number