Merge multiple tables into one table SQL Server

-1

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'.

edited Nov 14 '18 at 5:54

asked Nov 14 '18 at 3:25

Hung 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 add AND ... to the WHEN MATCHED part.

– ZLK
Nov 14 '18 at 21:54

add a comment |

-1

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'.

edited Nov 14 '18 at 5:54

asked Nov 14 '18 at 3:25

Hung 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 add AND ... to the WHEN MATCHED part.

– ZLK
Nov 14 '18 at 21:54

add a comment |

-1

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'.

edited Nov 14 '18 at 5:54

asked Nov 14 '18 at 3:25

Hung 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

edited Nov 14 '18 at 5:54

asked Nov 14 '18 at 3:25

Hung Nguyen

145

edited Nov 14 '18 at 5:54

asked Nov 14 '18 at 3:25

Hung Nguyen

145

edited Nov 14 '18 at 5:54

asked Nov 14 '18 at 3:25

Hung Nguyen

145

asked Nov 14 '18 at 3:25

Hung Nguyen

145

asked Nov 14 '18 at 3:25

Hung 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 add AND ... to the WHEN MATCHED part.

– 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 add AND ... to the WHEN MATCHED part.

– 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

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 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

Nimissha

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

fMadTech

6912

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

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

Nimissha

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

Nimissha

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

Nimissha

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

Nimissha

112

answered Nov 14 '18 at 4:11

Nimissha

112

answered Nov 14 '18 at 4:11

Nimissha

112

answered Nov 14 '18 at 4:11

Nimissha

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

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

fMadTech

6912

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

fMadTech

6912

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

fMadTech

6912

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

fMadTech

6912

answered Nov 14 '18 at 4:08

fMadTech

6912

answered Nov 14 '18 at 4:08

fMadTech

6912

answered Nov 14 '18 at 4:08

fMadTech

6912

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

You should check your table structure.

– fMadTech
Nov 14 '18 at 5:19

add a comment |

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