Google Sheet 两列重复项的自定义公式

Question

我在 Google 电子表格的 A 列的数据验证框中放置了一个有效的自定义公式，以禁止在同一列 A 中输入重复项。

=countif($A:$A77,A3)<=1

现在我有另一列 B 列，我希望将上面的公式从 A 列移动到 B 列，以提供以下内容的方式编辑它：

+---+------------+-------------+
|   |     A      |      B      | <-- the custom formula to be kept in column B only (in the data validation box).
+---+------------+-------------+
| 1 | John       | MySQL       | <-- if this row/data is already existing, then
| 2 | John       | Oracle      | <-- this entry is allowed (bcoz the data in this row do not match with data in the above row (considering both columns), and
| 3 | Viv        | MySQL       | <-- this entry is also allowed (bcoz the data in this row also do not match with data in the above two rows (considering both columns), and
| 4 | Al         | SQL         | <-- this entry is also allowed (bcoz the data in this row also do not match with data in the above three rows (considering both columns), but,
| 5 | Viv        | MySQL       | <-- this entry is NOT allowed (bcoz the data in this row entirely match with data in one of the above rows - row no. 3 (considering both columns).       
+---+------------+-------------+

我对上述公式稍作修改如下：

=countif($A:$B77,B3)<=1

但不满足上述第二个条件(Viv,MySQL)。

Answer 1

试试这个：

=COUNTIF(ARRAYFORMULA($A:$A77&$B:$B77),A3&B3)<=1

无需单独检查每一列，您只需将值连接在一起并检查是否存在超过一个连接字符串！

希望对您有所帮助！

Google Sheet 两列重复项的自定义公式

Google Sheet Custom Formula for Duplicates in two columns

validation

countif

google-sheets