下面演示单个司机以及所有司机的总行驶里程数和平均行驶里程数：
mysql> select name,sum(miles) as 'miles/driver'
? ? -> from driver_log group by name with rollup;
+-------+--------------+
| name? | miles/driver |
+-------+--------------+
| Ben? |? ? ? ? ? 362 |
| Henry |? ? ? ? ? 911 |
| Suzi? |? ? ? ? ? 893 |
| NULL? |? ? ? ? 2166 |
+-------+--------------+
4 rows in set (0.00 sec)
?
mysql> select name,avg(miles) as driver_avg
? ? -> from driver_log group by name with rollup;
+-------+------------+
| name? | driver_avg |
+-------+------------+
| Ben? |? 120.6667 |
| Henry |? 182.2000 |
| Suzi? |? 446.5000 |
| NULL? |? 216.6000 |
+-------+------------+
4 rows in set (0.00 sec)
?
mysql> select name,sum(miles) as 'miles/driver',avg(miles) as driver_avg
? ? -> from driver_log group by name with rollup;
+-------+--------------+------------+
| name? | miles/driver | driver_avg |
+-------+--------------+------------+
| Ben? |? ? ? ? ? 362 |? 120.6667 |
| Henry |? ? ? ? ? 911 |? 182.2000 |
| Suzi? |? ? ? ? ? 893 |? 446.5000 |
| NULL? |? ? ? ? 2166 |? 216.6000 |
+-------+--------------+------------+
4 rows in set (0.00 sec)
在多个分组下WITH ROLLUP同样有效：
mysql> select srcuser,dstuser,count(*) from mail group by srcuser,dstuser;
+---------+---------+----------+
| srcuser | dstuser | count(*) |
+---------+---------+----------+
| barb? ? | barb? ? |? ? ? ? 1 |
| barb? ? | tricia? |? ? ? ? 2 |
| gene? ? | barb? ? |? ? ? ? 2 |
| gene? ? | gene? ? |? ? ? ? 3 |
| gene? ? | tricia? |? ? ? ? 1 |
| phil? ? | barb? ? |? ? ? ? 1 |
| phil? ? | phil? ? |? ? ? ? 2 |
| phil? ? | tricia? |? ? ? ? 2 |
| tricia? | gene? ? |? ? ? ? 1 |
| tricia? | phil? ? |? ? ? ? 1 |
+---------+---------+----------+
10 rows in set (0.05 sec)
?
mysql> select srcuser,dstuser,count(*) from mail group by srcuser,dstuser with rollup;
+---------+---------+----------+
| srcuser | dstuser | count(*) |
+---------+---------+----------+
| barb? ? | barb? ? |? ? ? ? 1 |
| barb? ? | tricia? |? ? ? ? 2 |
| barb? ? | NULL? ? |? ? ? ? 3 |
| gene? ? | barb? ? |? ? ? ? 2 |
| gene? ? | gene? ? |? ? ? ? 3 |
| gene? ? | tricia? |? ? ? ? 1 |
| gene? ? | NULL? ? |? ? ? ? 6 |
| phil? ? | barb? ? |? ? ? ? 1 |
| phil? ? | phil? ? |? ? ? ? 2 |
| phil? ? | tricia? |? ? ? ? 2 |
| phil? ? | NULL? ? |? ? ? ? 5 |
| tricia? | gene? ? |? ? ? ? 1 |
| tricia? | phil? ? |? ? ? ? 1 |
| tricia? | NULL? ? |? ? ? ? 2 |
| NULL? ? | NULL? ? |? ? ? 16 |
+---------+---------+----------+
15 rows in set (0.00 sec)