SQL Server 2008 R2 - converting columns to rows and have all values in one column - sql-server-2008-r2

Question

I am having a hard time trying to wrap my head around the pivot/unpivot concepts and hoping someone can help or give me some guidance on how to approach my problem.
Here is a simplified sample table I have
+-------+------+------+------+------+------+
| SAUID | COM1 | COM2 | COM3 | COM4 | COM5 |
+-------+------+------+------+------+------+
| 1 | 24 | 22 | 100 | 0 | 45 |
| 2 | 34 | 55 | 789 | 23 | 0 |
| 3 | 33 | 99 | 5552 | 35 | 4675 |
+-------+------+------+------+------+------+
The end result I am looking for a table result similar below
+-------+-----------+-------+
| SAUID | OCCUPANCY | VALUE |
+-------+-----------+-------+
| 1 | COM1 | 24 |
| 1 | COM2 | 22 |
| 1 | COM3 | 100 |
| 1 | COM4 | 0 |
| 1 | COM5 | 45 |
| 2 | COM1 | 34 |
| 2 | COM2 | 55 |
| 2 | COM3 | 789 |
| 2 | COM4 | 23 |
| 2 | COM5 | 0 |
| 3 | COM1 | 33 |
| 3 | COM2 | 99 |
| 3 | COM3 | 5552 |
| 3 | COM4 | 35 |
| 3 | COM5 | 4675 |
+-------+-----------+-------+
Im looking around but most of the examples seem to use pivot but having a hard time trying to wrap that around my case as I need the values all in one column.
I hoping to experiment with some hardcoding to get fimilar with my example but my actual table columns are ~100 with varying #s of SAUID per table and looks like it will require dynamic sql?
Thanks for the help in advance.

Answer 1

Use UNPIVOT:
SELECT u.SAUID, u.OCCUPANCY, u.VALUE
FROM yourTable t
UNPIVOT
(
VALUE for OCCUPANCY in (COM1, COM2, COM3, COM4, COM5)
) u;
ORDER BY
u.SAUID, u.OCCUPANCY;
Demo