Question

Simply put,
I have these tables.

Planning: 
  Date | Machine | Product | PlanningParts

OKParts: 
  Date | Machine | Product | OKParts

Scrap: 
  Date | Machine | Product | ScrapParts

Trials: 
  Date | Machine | Product | TrialParts

Breakdowns: 
  Date | Machine | Product | Minutes

These tables can have two or more records for a same [Date | Machine | Product], they are not unique columns.
What is the best SQL Code(SQLite or SQL Server) to get this output?

Output:
  Date | Machine | Product | Planning | OKParts | ScrapParts | TrialParts | Minutes

Edit:
In the output, i need one line per [Date,Machine,Product] and the rest of the columns have to be the SUM
(I don’t speak english, Sorry)

Eidted:
Example:
(I would not put the table “Trials” to make it shorter)

Planning:
     Date    | Machine | Product | PlanningParts
     1/6/12  |  Blower | A001    | 100
     2/6/12  |  Blower | A002    | 100
     2/6/12  | Assembly| B001    | 50

OKParts:
     Date   | Machine | Product  | OKParts
     1/6/12 | Blower  | A001     | 50
     1/6/12 | Blower  | A001     | 20
     1/6/12 | Blower  | A002     | 100

Scrap:
     Date   | Machine | Product  | ScrapParts | Reason
     1/6/12 | Blower  | A001     | 5          | Low Weight
     1/6/12 | Blower  | A001     | 3          | High Weight
     2/6/12 | Assembly| B001     | 4          | Bad Cut

Breakdowns
     Date   | Machine | Product  | Minutes    | Reason
     1/6/12 | Blower  | A001     | 100        | Manteinance
     1/6/12 | Blower  | A001     | 20         | Manteinance
     2/6/12 | Assembly| B001     | 100        | Quality approval


   OUTPUT:
         Date   | Machine | Product  | Planning | OKParts | ScrapParts | Breakdowns
         1/6/12 | Blower  | A001     | 100      | 70      | 8          | 120
         1/6/12 | Blower  | A002     | 100      | 100     | 0          | 0
         2/6/12 | Assembly| B001     | 50       | 0       | 4          | 100

Answer 1

Create a CTE unioning all the tables into one, then using the SUM aggrigate function, add up the columns for each Date, Machine, Product group. A bit like this (not tested):

WITH AllParts AS (
SELECT Date, Machine, Product, PlanningParts, NULL AS OKParts, NULL AS ScrapParts, NULL AS TrialParts, NULL AS Breakdowns
FROM Planning
UNION ALL
SELECT Date, Machine, Product,NULL AS PlanningParts, OKParts, NULL AS ScrapParts, NULL AS TrialParts, NULL AS Breakdowns
FROM OKParts
UNION ALL
SELECT Date, Machine, Product,NULL AS PlanningParts, NULL AS OKParts, ScrapParts, NULL AS TrialParts, NULL AS Breakdowns
FROM Scrap
UNION ALL
SELECT Date, Machine, Product,NULL AS PlanningParts, NULL AS OKParts, NULL AS ScrapParts, TrialParts, NULL AS Breakdowns
FROM Trials
UNION ALL
SELECT Date, Machine, Product,NULL AS PlanningParts, NULL AS OKParts, NULL AS ScrapParts, TrialParts, Breakdowns
FROM BreakDowns
)
SELECT
Date, Machine, Product, SUM(OKParts) AS OKParts, SUM(ScrapParts) AS ScrapParts, SUM(TrialParts) AS TrialParts, SUM(BreakDowns) AS Breakdowns
FROM AllParts
GROUP BY Date, Machine, Product