Joining for BBQ as well

+------+-----------+
| side | firstname |
+------+-----------+
| B | Oleg |
| B | Andrei |
| B | Juha |
| B | Roman |
| B | Hannu |
| W | Markku |
| W | Marko |
| W | Kimmo |
| W | Jessica |
| W | Niklas |
+------+-----------+
10 rows in set (0,017 sec)

Note that there is no sauna reservation for today!

+------+-----------+
| side | firstname |
+------+-----------+
| B | Oleg |
| B | Roman |
| B | Marko |
| W | Kimmo |
| W | Andrei |
| W | Niklas |
+------+-----------+
6 rows in set (0,053 sec)

min 6

+------+-----------+
| side | firstname |
+------+-----------+
| B | Jessica |
| B | Jani |
| B | Rob |
| B | Niklas |
| W | Marko |
| W | Oleg |
| W | Andrei |
| W | Kimmo |
+------+-----------+
8 rows in set (0,000 sec)

+------+-----------+
| side | firstname |
+------+-----------+
| B | Andrei |
| B | Niklas |
| B | Oleg |
| B | Rob |
| W | Marko |
| W | Niko |
| W | Mika |
| W | Kimmo |
| W | Jani |
+------+-----------+
9 rows in set (0,017 sec)

+------+-----------+
| side | firstname |
+------+-----------+
| B | Niko |
| B | Marko |
| B | Rob |
| W | Kimmo |
| W | Oleg |
| W | Niklas |
| W | Andrei |
+------+-----------+
7 rows in set (0,122 sec)