数字分组？

Question

In the database table, I have about 1 million record.

In the number field there are about 11 digits number.

If the 5 digit number is the same, I want to group it so I can export it later.

How to archive this?

For example:

077129342480

074545344535

077127777476

077126565656

074546546654

You can see there are two group of number which are 07712 and 07454

In the group field I could declare the group name in number?

Answer 1

select SUBSTR(number, 1, 5) Groupnumber, number
from yourtable

Answer 2

您可以尝试GROUP BY SUBSTR(number, 1, 5)或GROUP BY LEFT(number, 5) 。

Answer 3

select LEFT(data, 5) Groupnumber, count(id)
from test
group by Groupnumber;