CODEWITHSUNDEEP
sqlsql-serversql-insert
Snow
Snow

Reputation: 47

How to insert row into a table by select column name and value from another table in SQL Server

I have a table with many columns like:

Table A:

ColumnA | ColumnB | ColumnC | ColumnD | ColumnE
_______________________________________________
valueA  | valueB  | valueC  | valueD  | valueE

How can I insert into Table B like below?

Table B:

ColumnName  | ColumnValue
_________________________
ColumnA     | valueA
ColumnB     | valueB
ColumnC     | valueC
ColumnD     | valueD
ColumnE     | valueE

Thank you!

Upvotes: 3

Views: 7661

Answers (4)

Pintu Kawar
Pintu Kawar

Reputation: 2156

Try with dynamic UNPIVOT:

DECLARE @COLS VARCHAR(MAX) = ''
SELECT @COLS = @COLS + ', [' + COLUMN_NAME + ']' FROM [yourDBName].INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'TableA'

DECLARE @ColumNames VARCHAR(MAX)= STUFF(@COLS, 1,1, '')

DECLARE @Cmd VARCHAR(MAX) = '
SELECT * FROM
(SELECT * FROM TableA) x
UNPIVOT
(
    [Value] FOR [Column] IN (' + @ColumNames + ')
) UNPVT'

INSERT INTO TableB
EXEC (@Cmd)

Upvotes: 1

LukStorms
LukStorms

Reputation: 29647

You can also use a normal UNPIVOT for this.

A example using table variables: 

declare @TableA table (Id int identity(1,1), ColumnA int, ColumnB int, ColumnC int, ColumnD int, ColumnE int);
declare @TableB table (ColumnName varchar(30), ColumnValue int);

insert into @TableA (ColumnA, ColumnB, ColumnC, ColumnD, ColumnE) values 
(1,2,3,4,5);

insert into @TableB (ColumnName, ColumnValue)
select ColumnName, ColumnValue from @TableA
unpivot (ColumnValue for ColumnName in (ColumnA, ColumnB, ColumnC, ColumnD, ColumnE)) unpiv;

select * from @TableB;

Returns:

ColumnName  ColumnValue
----------  -----------
ColumnA     1
ColumnB     2
ColumnC     3
ColumnD     4
ColumnE     5

Upvotes: 1

Sandip - Frontend Developer
Sandip - Frontend Developer

Reputation: 14669

Use UNPIVOT:

SELECT U.ColumnName,U.ColumnValue
FROM @tblA A
UNPIVOT
(
  ColumnValue
  for ColumnName in ([ColumnA], [ColumnB], [ColumnC],[ColumnD],[ColumnE])
) U;

Upvotes: 0

Pரதீப்
Pரதீப்

Reputation: 93704

You need to Unpivot the data. One option uses CROSS APPLY and table valued constructor

SELECT ColumnName,
       ColumnValue
FROM   Yourtable
       CROSS APPLY (VALUES ('ColumnA',ColumnA),
                           ('ColumnB',ColumnB),
                           ('ColumnC',ColumnC),
                           ('ColumnD',ColumnD),
                           ('ColumnE',ColumnE))TC(ColumnName, ColumnValue)

Upvotes: 3

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