mysql中加减乘除与求余和求平均值以及查询不等于某数值的实例

1.mysql加减乘除操作：

mysql> select score,score+5,score-5,score*5,score/5 from 4a;
+-------+---------+---------+---------+---------+
| score | score+5 | score-5 | score*5 | score/5 |
+-------+---------+---------+---------+---------+
|    93 |      98 |      88 |     465 | 18.6000 |
|    35 |      40 |      30 |     175 |  7.0000 |
|    46 |      51 |      41 |     230 |  9.2000 |
|    56 |      61 |      51 |     280 | 11.2000 |
|    79 |      84 |      74 |     395 | 15.8000 |
|    91 |      96 |      86 |     455 | 18.2000 |
|    53 |      58 |      48 |     265 | 10.6000 |
|    56 |      61 |      51 |     280 | 11.2000 |
|    58 |      63 |      53 |     290 | 11.6000 |
|    68 |      73 |      63 |     340 | 13.6000 |
|    71 |      76 |      66 |     355 | 14.2000 |
|    93 |      98 |      88 |     465 | 18.6000 |
|    67 |      72 |      62 |     335 | 13.4000 |
|    78 |      83 |      73 |     390 | 15.6000 |
|    88 |      93 |      83 |     440 | 17.6000 |
|    90 |      95 |      85 |     450 | 18.0000 |
|    92 |      97 |      87 |     460 | 18.4000 |
|    47 |      52 |      42 |     235 |  9.4000 |
|    68 |      73 |      63 |     340 | 13.6000 |
|    78 |      83 |      73 |     390 | 15.6000 |
|    81 |      86 |      76 |     405 | 16.2000 |
|    88 |      93 |      83 |     440 | 17.6000 |
+-------+---------+---------+---------+---------+
22 rows in set (0.00 sec)

2.mysql求余操作：

mysql> select score,score%5 from 4a;
+-------+---------+
| score | score%5 |
+-------+---------+
|    93 |       3 |
|    35 |       0 |
|    46 |       1 |
|    56 |       1 |
|    79 |       4 |
|    91 |       1 |
|    53 |       3 |
|    56 |       1 |
|    58 |       3 |
|    68 |       3 |
|    71 |       1 |
|    93 |       3 |
|    67 |       2 |
|    78 |       3 |
|    88 |       3 |
|    90 |       0 |
|    92 |       2 |
|    47 |       2 |
|    68 |       3 |
|    78 |       3 |
|    81 |       1 |
|    88 |       3 |
+-------+---------+
22 rows in set (0.00 sec)

3.mysql求平均值操作：

mysql> select score,avg(score) from 4a;
+-------+------------+
| score | avg(score) |
+-------+------------+
|    93 |    71.6364 |
+-------+------------+
1 row in set (0.00 sec)

4.mysql求不等于某数值操作：

mysql> select score,score!=88 from 4a;     
+-------+-----------+
| score | score!=88 |
+-------+-----------+
|    93 |         1 |
|    35 |         1 |
|    46 |         1 |
|    56 |         1 |
|    79 |         1 |
|    91 |         1 |
|    53 |         1 |
|    56 |         1 |
|    58 |         1 |
|    68 |         1 |
|    71 |         1 |
|    93 |         1 |
|    67 |         1 |
|    78 |         1 |
|    88 |         0 |
|    90 |         1 |
|    92 |         1 |
|    47 |         1 |
|    68 |         1 |
|    78 |         1 |
|    81 |         1 |
|    88 |         0 |
+-------+-----------+
22 rows in set (0.00 sec)

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