在 SQL 中使用联合选择

Question

Why when i run the syntax in sql and the result will be double data?

The command is :

SELECT     1 AS Urut, M.Kode_Project, M.Nama_Project, M.Kode_Panel, D .Nama_Stater1, D .Tipe, D .Komponen, D .Pole, D .Amps, D .Merek, D .Qty, D .IsTitipan
FROM         TransM M INNER JOIN
                      TransD D ON M.Kode_Project = D .Kode_Project AND M.Kode_Panel = D .Kode_Panel
WHERE     M.Kode_Project = '17-0002' AND M.Kode_Panel = 'A'
UNION ALL
SELECT     2 AS Urut, M.Kode_Project, M.Nama_Project, M.Kode_Panel, M.Nama_Stater1, 'COOPER (' + SubString(Kode, 5, 100) + ')' AS Tipe, 
                      ' (' + LT + ') X ' + CONVERT(VarChar(20), Lapis) AS Komponen, '' AS Pole, '' AS Amps, ' IMPORT ' AS Merek, 1 AS Qty, 0 AS IsTitipan
FROM         TransM M INNER JOIN
                      TransW W ON M.Kode_Project = W.Kode_Project AND M.Kode_Panel = W.Kode_Panel
WHERE     LEFT(Kode, 1) <= 'B' AND M.Kode_Project = '17-0002' AND M.Kode_Panel = 'A'

What's the wrong in the command?, Thank's for who's helping.

Answer 1

UNION ALL will merge duplicate rows from result of two select, change

UNION ALL

to just

UNION

this will remove duplicate rows from the result