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Hello, I have 3 tables that I was checking the data in them matched through and my query was returning too many rows and I could not see what was wrong with my query.
These are examples tables:
Table 1 (Temp1)
Table 2 (Temp2)
Table 3 (Temp3)
Result
The Result I wanted to see
This is the query I wrote
Hope you can help
Thanks Justin
These are examples tables:
Table 1 (Temp1)
ID Name
1 Justin
2 Richard
Table 2 (Temp2)
ID Name Books
1 Justin Book1
2 Richard Book1
2 Richard Book10
2 Richard Book23
Table 3 (Temp3)
ID Name Books
1 Justin Book1
2 Richard Book1
2 Richard Book10
2 Richard Book23
2 Richard Book33
Result
T1_ID T2_ID T3_ID T1_Name T2_Name T3_Name T2_Books T3_Books
1 1 1 Justin Justin Justin Book1 Book1
2 2 2 Richard Richard Richard Book1 Book1
2 2 2 Richard Richard Richard Book1 Book10
2 2 2 Richard Richard Richard Book1 Book23
2 2 2 Richard Richard Richard Book10 Book1
2 2 2 Richard Richard Richard Book10 Book10
2 2 2 Richard Richard Richard Book10 Book23
2 2 2 Richard Richard Richard Book23 Book1
2 2 2 Richard Richard Richard Book23 Book10
2 2 2 Richard Richard Richard Book23 Book23
The Result I wanted to see
T1_ID T2_ID T3_ID T1_Name T2_Name T3_Name T2_Books T3_Books
1 1 1 Justin Justin Justin Book1 Book1
2 2 2 Richard Richard Richard Book1 Book1
2 2 2 Richard Richard Richard Book10 Book10
2 2 2 Richard Richard Richard Book23 Book23
2 2 2 Richard Richard Richard NULL Book33
This is the query I wrote
SELECT Test.T1_ID,Test.T2_ID,Test.T3_ID,
Test.T1_Name,Test.T2_Name,Test.T3_Name,
Test.T2_Books,Test.T3_Books
FROM (
SELECT T1.ID AS T1_ID,T2.ID AS T2_ID,T3.ID AS T3_ID,
T1.Name AS T1_Name,T2.Name AS T2_Name,T3.Name AS T3_Name,
T2.Books AS T2_Books,T3.Books AS T3_Books
FROM [TestDBJustin].[dbo].[Temp1] AS T1
LEFT JOIN [TestDBJustin].[dbo].[Temp2] AS T2 ON T1.ID = T2.ID
LEFT JOIN [TestDBJustin].[dbo].[Temp3] AS T3 ON T1.ID = T3.ID
) AS Test
Hope you can help
Thanks Justin
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