Merge multiple tables into one table SQL Server
I want to merge 3 tables into one only to get full data with conditions below
- merge 3 tables [test1], [test2], [test3] into one table [test]
- If when merging, if a column is blank select from another table
- Col1 exists in all 3 tables
Here is my example code to merge from table 2 into test.
MERGE INTO [dbo].[test] a
USING [dbo].[test2] b ON a.col1 = b.col1
WHEN MATCHED THEN
UPDATE
SET col1 = b.col1,
col2 = b.col2,
col3 = b.col3,
col4 = b.col4
WHERE col1 = '' OR col2 = '' OR col3 = '' OR col4 = '';
It get errors:
Incorrect syntax near the keyword 'where'.
sql
sql-server tsql sql-server-2008 sql-server-2012 asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
add a comment |
I want to merge 3 tables into one only to get full data with conditions below
- merge 3 tables [test1], [test2], [test3] into one table [test]
- If when merging, if a column is blank select from another table
- Col1 exists in all 3 tables
Here is my example code to merge from table 2 into test.
MERGE INTO [dbo].[test] a
USING [dbo].[test2] b ON a.col1 = b.col1
WHEN MATCHED THEN
UPDATE
SET col1 = b.col1,
col2 = b.col2,
col3 = b.col3,
col4 = b.col4
WHERE col1 = '' OR col2 = '' OR col3 = '' OR col4 = '';
It get errors:
Incorrect syntax near the keyword 'where'.
sql
sql-server tsql sql-server-2008 sql-server-2012 asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
You probably want to add to the matched part (e.g.when matched and a.col1 = '' or a.col2 = '' ...) assuming you're updating where col1 in test is blank
– ZLK
Nov 14 '18 at 3:35
Why are updating the main table ? instead of inserting non null values from the 3 tables ?
– Sanal Sunny
Nov 14 '18 at 4:01
@SanalSunny I think it's the same.
– Hung Nguyen
Nov 14 '18 at 5:16
@ZLK i think the error syntax is before where clause..
– Hung Nguyen
Nov 14 '18 at 5:19
The error is because you can't put a where clause there like that. I told you a work-around that is effectively the same. Remove the where clause and addAND ...to theWHEN MATCHEDpart.
– ZLK
Nov 14 '18 at 21:54
add a comment |
I want to merge 3 tables into one only to get full data with conditions below
- merge 3 tables [test1], [test2], [test3] into one table [test]
- If when merging, if a column is blank select from another table
- Col1 exists in all 3 tables
Here is my example code to merge from table 2 into test.
MERGE INTO [dbo].[test] a
USING [dbo].[test2] b ON a.col1 = b.col1
WHEN MATCHED THEN
UPDATE
SET col1 = b.col1,
col2 = b.col2,
col3 = b.col3,
col4 = b.col4
WHERE col1 = '' OR col2 = '' OR col3 = '' OR col4 = '';
It get errors:
Incorrect syntax near the keyword 'where'.
sql
sql-server tsql sql-server-2008 sql-server-2012 asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
I want to merge 3 tables into one only to get full data with conditions below
- merge 3 tables [test1], [test2], [test3] into one table [test]
- If when merging, if a column is blank select from another table
- Col1 exists in all 3 tables
Here is my example code to merge from table 2 into test.
MERGE INTO [dbo].[test] a
USING [dbo].[test2] b ON a.col1 = b.col1
WHEN MATCHED THEN
UPDATE
SET col1 = b.col1,
col2 = b.col2,
col3 = b.col3,
col4 = b.col4
WHERE col1 = '' OR col2 = '' OR col3 = '' OR col4 = '';
It get errors:
Incorrect syntax near the keyword 'where'.
sql
sql-server tsql sql-server-2008 sql-server-2012 sql
sql-server tsql sql-server-2008 sql-server-2012 asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
edited Nov 14 '18 at 5:54
Hung Nguyen
asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
asked Nov 14 '18 at 3:25
Hung NguyenHung Nguyen
145
145
You probably want to add to the matched part (e.g.when matched and a.col1 = '' or a.col2 = '' ...) assuming you're updating where col1 in test is blank
– ZLK
Nov 14 '18 at 3:35
Why are updating the main table ? instead of inserting non null values from the 3 tables ?
– Sanal Sunny
Nov 14 '18 at 4:01
@SanalSunny I think it's the same.
– Hung Nguyen
Nov 14 '18 at 5:16
@ZLK i think the error syntax is before where clause..
– Hung Nguyen
Nov 14 '18 at 5:19
The error is because you can't put a where clause there like that. I told you a work-around that is effectively the same. Remove the where clause and addAND ...to theWHEN MATCHEDpart.
– ZLK
Nov 14 '18 at 21:54
add a comment |
You probably want to add to the matched part (e.g.when matched and a.col1 = '' or a.col2 = '' ...) assuming you're updating where col1 in test is blank
– ZLK
Nov 14 '18 at 3:35
Why are updating the main table ? instead of inserting non null values from the 3 tables ?
– Sanal Sunny
Nov 14 '18 at 4:01
@SanalSunny I think it's the same.
– Hung Nguyen
Nov 14 '18 at 5:16
@ZLK i think the error syntax is before where clause..
– Hung Nguyen
Nov 14 '18 at 5:19
The error is because you can't put a where clause there like that. I told you a work-around that is effectively the same. Remove the where clause and addAND ...to theWHEN MATCHEDpart.
– ZLK
Nov 14 '18 at 21:54
You probably want to add to the matched part (e.g.
when matched and a.col1 = '' or a.col2 = '' ...) assuming you're updating where col1 in test is blank– ZLK
Nov 14 '18 at 3:35
You probably want to add to the matched part (e.g.
when matched and a.col1 = '' or a.col2 = '' ...) assuming you're updating where col1 in test is blank– ZLK
Nov 14 '18 at 3:35
Why are updating the main table ? instead of inserting non null values from the 3 tables ?
– Sanal Sunny
Nov 14 '18 at 4:01
Why are updating the main table ? instead of inserting non null values from the 3 tables ?
– Sanal Sunny
Nov 14 '18 at 4:01
@SanalSunny I think it's the same.
– Hung Nguyen
Nov 14 '18 at 5:16
@SanalSunny I think it's the same.
– Hung Nguyen
Nov 14 '18 at 5:16
@ZLK i think the error syntax is before where clause..
– Hung Nguyen
Nov 14 '18 at 5:19
@ZLK i think the error syntax is before where clause..
– Hung Nguyen
Nov 14 '18 at 5:19
The error is because you can't put a where clause there like that. I told you a work-around that is effectively the same. Remove the where clause and add
AND ... to the WHEN MATCHED part.– ZLK
Nov 14 '18 at 21:54
The error is because you can't put a where clause there like that. I told you a work-around that is effectively the same. Remove the where clause and add
AND ... to the WHEN MATCHED part.– ZLK
Nov 14 '18 at 21:54
add a comment |
2 Answers
2
active
oldest
votes
Please try the COALESCE function rather than using the where condition. The COALESCE function takes the next value in case there is a NULL is encountered.
Merge into [dbo].[test] a
using [dbo].[test2] b
on a.col1 = b.col1
when matched then
update
set col2 = COALESCE(a.col2, b.col2),
col3 = COALESCE(a.col3, b.col3),
col4 = COALESCE(a.col4, b.col4);
So in the modified code, if the Table [dbo].[test] col2 is Null then it takes the value from [dbo].[test2]. Since you will be using COALESCE, you will be able to merge any number of values.
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
It works when values is NULL, but when value is '' or ' '. How could we use?
– Hung Nguyen
Nov 14 '18 at 5:15
In that scenario the CASE WHEN statement is to be used. Please replace COALESCE(a.col2, b.col2) with CASE WHEN a.col2 = '' THEN b.col2 END
– Nimissha
Nov 15 '18 at 6:17
add a comment |
Can you show the table Structure.
you can use UNION ALL Operator follow this link.
https://www.techonthenet.com/sql_server/union.php
OR mixture of INNER JOIN with UPDATE statement combining the condition on WHERE clause
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
I've tried but it does not work with where clause
– Hung Nguyen
Nov 14 '18 at 5:15
You should check your table structure.
– fMadTech
Nov 14 '18 at 5:19
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Please try the COALESCE function rather than using the where condition. The COALESCE function takes the next value in case there is a NULL is encountered.
Merge into [dbo].[test] a
using [dbo].[test2] b
on a.col1 = b.col1
when matched then
update
set col2 = COALESCE(a.col2, b.col2),
col3 = COALESCE(a.col3, b.col3),
col4 = COALESCE(a.col4, b.col4);
So in the modified code, if the Table [dbo].[test] col2 is Null then it takes the value from [dbo].[test2]. Since you will be using COALESCE, you will be able to merge any number of values.
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
It works when values is NULL, but when value is '' or ' '. How could we use?
– Hung Nguyen
Nov 14 '18 at 5:15
In that scenario the CASE WHEN statement is to be used. Please replace COALESCE(a.col2, b.col2) with CASE WHEN a.col2 = '' THEN b.col2 END
– Nimissha
Nov 15 '18 at 6:17
add a comment |
Please try the COALESCE function rather than using the where condition. The COALESCE function takes the next value in case there is a NULL is encountered.
Merge into [dbo].[test] a
using [dbo].[test2] b
on a.col1 = b.col1
when matched then
update
set col2 = COALESCE(a.col2, b.col2),
col3 = COALESCE(a.col3, b.col3),
col4 = COALESCE(a.col4, b.col4);
So in the modified code, if the Table [dbo].[test] col2 is Null then it takes the value from [dbo].[test2]. Since you will be using COALESCE, you will be able to merge any number of values.
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
It works when values is NULL, but when value is '' or ' '. How could we use?
– Hung Nguyen
Nov 14 '18 at 5:15
In that scenario the CASE WHEN statement is to be used. Please replace COALESCE(a.col2, b.col2) with CASE WHEN a.col2 = '' THEN b.col2 END
– Nimissha
Nov 15 '18 at 6:17
add a comment |
Please try the COALESCE function rather than using the where condition. The COALESCE function takes the next value in case there is a NULL is encountered.
Merge into [dbo].[test] a
using [dbo].[test2] b
on a.col1 = b.col1
when matched then
update
set col2 = COALESCE(a.col2, b.col2),
col3 = COALESCE(a.col3, b.col3),
col4 = COALESCE(a.col4, b.col4);
So in the modified code, if the Table [dbo].[test] col2 is Null then it takes the value from [dbo].[test2]. Since you will be using COALESCE, you will be able to merge any number of values.
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
Please try the COALESCE function rather than using the where condition. The COALESCE function takes the next value in case there is a NULL is encountered.
Merge into [dbo].[test] a
using [dbo].[test2] b
on a.col1 = b.col1
when matched then
update
set col2 = COALESCE(a.col2, b.col2),
col3 = COALESCE(a.col3, b.col3),
col4 = COALESCE(a.col4, b.col4);
So in the modified code, if the Table [dbo].[test] col2 is Null then it takes the value from [dbo].[test2]. Since you will be using COALESCE, you will be able to merge any number of values.
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
answered Nov 14 '18 at 4:11
NimisshaNimissha
112
112
It works when values is NULL, but when value is '' or ' '. How could we use?
– Hung Nguyen
Nov 14 '18 at 5:15
In that scenario the CASE WHEN statement is to be used. Please replace COALESCE(a.col2, b.col2) with CASE WHEN a.col2 = '' THEN b.col2 END
– Nimissha
Nov 15 '18 at 6:17
add a comment |
It works when values is NULL, but when value is '' or ' '. How could we use?
– Hung Nguyen
Nov 14 '18 at 5:15
In that scenario the CASE WHEN statement is to be used. Please replace COALESCE(a.col2, b.col2) with CASE WHEN a.col2 = '' THEN b.col2 END
– Nimissha
Nov 15 '18 at 6:17
It works when values is NULL, but when value is '' or ' '. How could we use?
– Hung Nguyen
Nov 14 '18 at 5:15
It works when values is NULL, but when value is '' or ' '. How could we use?
– Hung Nguyen
Nov 14 '18 at 5:15
In that scenario the CASE WHEN statement is to be used. Please replace COALESCE(a.col2, b.col2) with CASE WHEN a.col2 = '' THEN b.col2 END
– Nimissha
Nov 15 '18 at 6:17
In that scenario the CASE WHEN statement is to be used. Please replace COALESCE(a.col2, b.col2) with CASE WHEN a.col2 = '' THEN b.col2 END
– Nimissha
Nov 15 '18 at 6:17
add a comment |
Can you show the table Structure.
you can use UNION ALL Operator follow this link.
https://www.techonthenet.com/sql_server/union.php
OR mixture of INNER JOIN with UPDATE statement combining the condition on WHERE clause
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
I've tried but it does not work with where clause
– Hung Nguyen
Nov 14 '18 at 5:15
You should check your table structure.
– fMadTech
Nov 14 '18 at 5:19
add a comment |
Can you show the table Structure.
you can use UNION ALL Operator follow this link.
https://www.techonthenet.com/sql_server/union.php
OR mixture of INNER JOIN with UPDATE statement combining the condition on WHERE clause
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
I've tried but it does not work with where clause
– Hung Nguyen
Nov 14 '18 at 5:15
You should check your table structure.
– fMadTech
Nov 14 '18 at 5:19
add a comment |
Can you show the table Structure.
you can use UNION ALL Operator follow this link.
https://www.techonthenet.com/sql_server/union.php
OR mixture of INNER JOIN with UPDATE statement combining the condition on WHERE clause
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
Can you show the table Structure.
you can use UNION ALL Operator follow this link.
https://www.techonthenet.com/sql_server/union.php
OR mixture of INNER JOIN with UPDATE statement combining the condition on WHERE clause
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
answered Nov 14 '18 at 4:08
fMadTechfMadTech
8912
8912
I've tried but it does not work with where clause
– Hung Nguyen
Nov 14 '18 at 5:15
You should check your table structure.
– fMadTech
Nov 14 '18 at 5:19
add a comment |
I've tried but it does not work with where clause
– Hung Nguyen
Nov 14 '18 at 5:15
You should check your table structure.
– fMadTech
Nov 14 '18 at 5:19
I've tried but it does not work with where clause
– Hung Nguyen
Nov 14 '18 at 5:15
I've tried but it does not work with where clause
– Hung Nguyen
Nov 14 '18 at 5:15
You should check your table structure.
– fMadTech
Nov 14 '18 at 5:19
You should check your table structure.
– fMadTech
Nov 14 '18 at 5:19
add a comment |
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You probably want to add to the matched part (e.g.
when matched and a.col1 = '' or a.col2 = '' ...) assuming you're updating where col1 in test is blank– ZLK
Nov 14 '18 at 3:35
Why are updating the main table ? instead of inserting non null values from the 3 tables ?
– Sanal Sunny
Nov 14 '18 at 4:01
@SanalSunny I think it's the same.
– Hung Nguyen
Nov 14 '18 at 5:16
@ZLK i think the error syntax is before where clause..
– Hung Nguyen
Nov 14 '18 at 5:19
The error is because you can't put a where clause there like that. I told you a work-around that is effectively the same. Remove the where clause and add
AND ...to theWHEN MATCHEDpart.– ZLK
Nov 14 '18 at 21:54