查询函数中的日期比较未返回结果

我正在使用以下查询

=QUERY(fulldata,"select avg(C) where A<>'Saturday'")

我的数据看起来像-

+-----------+-----------+----+-----+-----+-----+-----+---+-----+-----+-----+-----+-----+
|     A     |     B     | C  |  D  |  E  |  F  |  G  | H |  I  |  J  |  K  |  L  |  M  |
+-----------+-----------+----+-----+-----+-----+-----+---+-----+-----+-----+-----+-----+
| Sunday    | 1- Jan-18 |  6 |  12 |   0 | 1.5 | 2.5 | 2 |   0 |   0 |   0 |   0 |   0 |
| Monday    | 2- Jan-18 |  6 |   0 | 9.5 |   4 |   0 | 0 |   0 | 2.5 |   2 |   0 |   0 |
| Tuesday   | 3- Jan-18 |  7 |   0 |   7 |   0 |   0 | 2 |   0 |   4 |   1 |   3 |   0 |
| Wednesday | 4- Jan-18 |  7 | 1.5 |   6 | 1.5 |   0 | 0 |   0 |   2 | 0.5 | 5.5 |   0 |
| Thursday  | 5- Jan-18 |  8 |   1 | 7.5 |   0 |   0 | 2 |   0 | 1.5 |   1 |   3 |   0 |
| Friday    | 6- Jan-18 | 14 |   6 |   0 |   0 |   0 | 2 |   0 | 1.5 | 0.5 |   0 |   0 |
| Saturday  | 7- Jan-18 |  9 | 0.5 |   0 | 0.5 | 1.5 | 2 | 3.5 | 4.5 | 0.5 | 1.5 | 0.5 |
+-----------+-----------+----+-----+-----+-----+-----+---+-----+-----+-----+-----+-----+

然而,我没有从查询中得到任何响应。查询运行时没有任何问题,但没有结果。

我只是想找到 C的平均值 什么时候 A不是星期六 . 有人能指出我的查询和/或逻辑哪里出错了吗?