Join two tables in SQL Server
I have to tables
Customer
CustomerID Name Surname
---------------------------------
1 Adam Test
2 Robert Test2
3 John Test3
CustomerAddress
CustomerAddressId CustomerId AddressId
-------------------------------------------
1 1 1
2 1 2
3 1 3
4 2 6
5 2 7
6 2 8
I want to select CustomerId from these two tables.
I wrote this query but it multiplies my records.
sql-server join edited Nov 15 '18 at 16:48
marc_s
582k13011231269
asked Nov 15 '18 at 15:38
adamek339adamek339
366
add a comment |
I have to tables
Customer
CustomerID Name Surname
---------------------------------
1 Adam Test
2 Robert Test2
3 John Test3
CustomerAddress
CustomerAddressId CustomerId AddressId
-------------------------------------------
1 1 1
2 1 2
3 1 3
4 2 6
5 2 7
6 2 8
I want to select CustomerId from these two tables.
I wrote this query but it multiplies my records.
sql-server join edited Nov 15 '18 at 16:48
marc_s
582k13011231269
asked Nov 15 '18 at 15:38
adamek339adamek339
366
1
What query did you write? It would be helpful for us to have the query, expected output, etc.
– Jeffrey Van Laethem
Nov 15 '18 at 15:53
you have 2 proposed answers below check them out and either will get you the non multiplied answers your looking for. @adamek339
– junketsu
Nov 15 '18 at 18:39
add a comment |
I have to tables
Customer
CustomerID Name Surname
---------------------------------
1 Adam Test
2 Robert Test2
3 John Test3
CustomerAddress
CustomerAddressId CustomerId AddressId
-------------------------------------------
1 1 1
2 1 2
3 1 3
4 2 6
5 2 7
6 2 8
I want to select CustomerId from these two tables.
I wrote this query but it multiplies my records.
sql-server join edited Nov 15 '18 at 16:48
marc_s
582k13011231269
asked Nov 15 '18 at 15:38
adamek339adamek339
366
I have to tables
Customer
CustomerID Name Surname
---------------------------------
1 Adam Test
2 Robert Test2
3 John Test3
CustomerAddress
CustomerAddressId CustomerId AddressId
-------------------------------------------
1 1 1
2 1 2
3 1 3
4 2 6
5 2 7
6 2 8
I want to select CustomerId from these two tables.
I wrote this query but it multiplies my records.
sql-server join sql-server join edited Nov 15 '18 at 16:48
marc_s
582k13011231269
asked Nov 15 '18 at 15:38
adamek339adamek339
366
edited Nov 15 '18 at 16:48
marc_s
582k13011231269
asked Nov 15 '18 at 15:38
adamek339adamek339
366
edited Nov 15 '18 at 16:48
marc_s
582k13011231269
edited Nov 15 '18 at 16:48
marc_s
582k13011231269
edited Nov 15 '18 at 16:48
marc_s
582k13011231269
582k13011231269
asked Nov 15 '18 at 15:38
adamek339adamek339
366
asked Nov 15 '18 at 15:38
adamek339adamek339
366
asked Nov 15 '18 at 15:38
adamek339adamek339
366
366
1
What query did you write? It would be helpful for us to have the query, expected output, etc.
– Jeffrey Van Laethem
Nov 15 '18 at 15:53
you have 2 proposed answers below check them out and either will get you the non multiplied answers your looking for. @adamek339
– junketsu
Nov 15 '18 at 18:39
add a comment |
1
What query did you write? It would be helpful for us to have the query, expected output, etc.
– Jeffrey Van Laethem
Nov 15 '18 at 15:53
you have 2 proposed answers below check them out and either will get you the non multiplied answers your looking for. @adamek339
– junketsu
Nov 15 '18 at 18:39
1
1
What query did you write? It would be helpful for us to have the query, expected output, etc.
– Jeffrey Van Laethem
Nov 15 '18 at 15:53
What query did you write? It would be helpful for us to have the query, expected output, etc.
– Jeffrey Van Laethem
Nov 15 '18 at 15:53
you have 2 proposed answers below check them out and either will get you the non multiplied answers your looking for. @adamek339
– junketsu
Nov 15 '18 at 18:39
you have 2 proposed answers below check them out and either will get you the non multiplied answers your looking for. @adamek339
– junketsu
Nov 15 '18 at 18:39
add a comment |
3 Answers
3
active
oldest
votes
If you're looking for a distinct list of CustomerId from both tables, it'll be easiest to use UNION:
SELECT CustomerId
FROM Customer
UNION SELECT CustomerId
FROM CustomerAddress
Using UNION ALL would show duplicates in your result set.
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
add a comment |
You can use DISTINCT keyword with JOIN :
SELECT DISTINCT C.CustomerId
FROM Customer c INNER JOIIN
CustomerAddress cs
ON CD.CustomerId = C.CustomerId;
Without DISTINCT it would return multiple CustomerIds as because of second table has multiple address for same customer.
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
add a comment |
If you want to capture Customers which has addresses you can use following script :
SELECT *
FROM Customer C
WHERE EXISTS (SELECT 1 FROM CustomerAddress CA WHERE C.CustomerId=CA.CustomerId)
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
If you're looking for a distinct list of CustomerId from both tables, it'll be easiest to use UNION:
SELECT CustomerId
FROM Customer
UNION SELECT CustomerId
FROM CustomerAddress
Using UNION ALL would show duplicates in your result set.
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
add a comment |
If you're looking for a distinct list of CustomerId from both tables, it'll be easiest to use UNION:
SELECT CustomerId
FROM Customer
UNION SELECT CustomerId
FROM CustomerAddress
Using UNION ALL would show duplicates in your result set.
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
add a comment |
If you're looking for a distinct list of CustomerId from both tables, it'll be easiest to use UNION:
SELECT CustomerId
FROM Customer
UNION SELECT CustomerId
FROM CustomerAddress
Using UNION ALL would show duplicates in your result set.
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
If you're looking for a distinct list of CustomerId from both tables, it'll be easiest to use UNION:
SELECT CustomerId
FROM Customer
UNION SELECT CustomerId
FROM CustomerAddress
Using UNION ALL would show duplicates in your result set.
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
answered Nov 15 '18 at 15:52
Jeffrey Van LaethemJeffrey Van Laethem
2,05211526
2,05211526
add a comment |
add a comment |
You can use DISTINCT keyword with JOIN :
SELECT DISTINCT C.CustomerId
FROM Customer c INNER JOIIN
CustomerAddress cs
ON CD.CustomerId = C.CustomerId;
Without DISTINCT it would return multiple CustomerIds as because of second table has multiple address for same customer.
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
add a comment |
You can use DISTINCT keyword with JOIN :
SELECT DISTINCT C.CustomerId
FROM Customer c INNER JOIIN
CustomerAddress cs
ON CD.CustomerId = C.CustomerId;
Without DISTINCT it would return multiple CustomerIds as because of second table has multiple address for same customer.
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
add a comment |
You can use DISTINCT keyword with JOIN :
SELECT DISTINCT C.CustomerId
FROM Customer c INNER JOIIN
CustomerAddress cs
ON CD.CustomerId = C.CustomerId;
Without DISTINCT it would return multiple CustomerIds as because of second table has multiple address for same customer.
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
You can use DISTINCT keyword with JOIN :
SELECT DISTINCT C.CustomerId
FROM Customer c INNER JOIIN
CustomerAddress cs
ON CD.CustomerId = C.CustomerId;
Without DISTINCT it would return multiple CustomerIds as because of second table has multiple address for same customer.
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
answered Nov 15 '18 at 15:41
Yogesh SharmaYogesh Sharma
33.8k51440
33.8k51440
add a comment |
add a comment |
If you want to capture Customers which has addresses you can use following script :
SELECT *
FROM Customer C
WHERE EXISTS (SELECT 1 FROM CustomerAddress CA WHERE C.CustomerId=CA.CustomerId)
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
add a comment |
If you want to capture Customers which has addresses you can use following script :
SELECT *
FROM Customer C
WHERE EXISTS (SELECT 1 FROM CustomerAddress CA WHERE C.CustomerId=CA.CustomerId)
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
add a comment |
If you want to capture Customers which has addresses you can use following script :
SELECT *
FROM Customer C
WHERE EXISTS (SELECT 1 FROM CustomerAddress CA WHERE C.CustomerId=CA.CustomerId)
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
If you want to capture Customers which has addresses you can use following script :
SELECT *
FROM Customer C
WHERE EXISTS (SELECT 1 FROM CustomerAddress CA WHERE C.CustomerId=CA.CustomerId)
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
answered Nov 15 '18 at 15:50
Zeki GumusZeki Gumus
1,445313
1,445313
add a comment |
add a comment |
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1
What query did you write? It would be helpful for us to have the query, expected output, etc.
– Jeffrey Van Laethem
Nov 15 '18 at 15:53
you have 2 proposed answers below check them out and either will get you the non multiplied answers your looking for. @adamek339
– junketsu
Nov 15 '18 at 18:39