How can UNPIVOT be used to obtain related data along with column names in a dynamic SQL SELECT statement?

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UNPIVOT is a SQL operation that is used to transform columns into rows. It can be used to obtain related data along with column names in a dynamic SQL SELECT statement.

To use UNPIVOT in a dynamic SQL SELECT statement, first, the columns that you want to unpivot must be identified. Then, a dynamic SQL statement can be constructed that selects the unpivoted data along with the column names.

Here is an example of how UNPIVOT can be used to obtain related data and column names in a dynamic SQL SELECT statement:

-- Set the column names that will be unpivoted
DECLARE @column_names NVARCHAR(MAX) = 'Column1, Column2, Column3'

-- Construct the dynamic SQL SELECT statement
DECLARE @sql NVARCHAR(MAX) =
'SELECT ColumnName, ColumnValue
FROM (
  SELECT ' + @column_names + '
  FROM YourTable
) t
UNPIVOT (
  ColumnValue FOR ColumnName IN (' + @column_names + ')
) unpvt'

-- Execute the dynamic SQL SELECT statement
EXEC sp_executesql @sql

In this example, the @column_names variable contains the names of the columns that will be unpivoted. These column names are then used to construct the dynamic SQL SELECT statement.

The UNPIVOT operation is used to unpivot the columns and transform them into rows. The resulting table includes two columns: ColumnName and ColumnValue. The ColumnName column contains the names of the unpivoted columns, while the ColumnValue column contains the values of the unpivoted columns.

By using UNPIVOT in a dynamic SQL SELECT statement, you can obtain related data and column names in a flexible and efficient manner.