REGEXP_REPLACE与DISTINCT

问题描述 投票:3回答:1

我试图用不同与REGEXP_REPLACE和返回0行。

我已经在MySQL 8.0中创建一个测试表

   CREATE TABLE phone(
   id serial primary key,
   phone_number char(25));

   INSERT INTO phone (phone_number)
   VALUES ('(423) 330-9999');

   INSERT INTO phone (phone_number)
   VALUES ('(423)3309999');

   INSERT INTO phone (phone_number)
   VALUES ('423-330-1111)');

   INSERT INTO phone (phone_number)
   VALUES ('1-423-330-6666');

   INSERT INTO phone (phone_number)
   VALUES ('1A423*330*1111');

   INSERT INTO phone (phone_number)
   VALUES ('5553301111');

- 然后

select 
   REGEXP_REPLACE(phone_number, '[^0-9]', '',1, 0, 'm') as clean_phone
from phone

---工作正常 - > clean_phone 4233309999 4233309999 4233301111 14233306666 14233301111 5553301111

---计数

select 
   count(REGEXP_REPLACE(phone_number, '[^0-9]', '',1, 0, 'm')) as 
   clean_phone
from phone

---工作正常 - > clean_phone 6

- 不同clean_phone

select 
   distinct(REGEXP_REPLACE(phone_number, '[^0-9]', '',1, 0, 'm')) as 
   clean_phone
from phone

---返回空 - > clean_phone

我不明白为什么不同不起作用?

mysql sql mysqli mysql-8.0
1个回答
2
投票

不同的是不是一个函数,所以你并不需要不同的(),但只有不同

select  distinct REGEXP_REPLACE(phone_number, '[^0-9]', '',1, 0, 'm') as 
   clean_phone
from phone

.

    select distinct  clear_phone from(
    select   REGEXP_REPLACE(phone_number, '[^0-9]', '',1, 0, 'm')  clear_phone
   from phone ) t 

如果错误仍然存​​在,你可以尝试使用插入/选择在一个虚表

  insert into dummy_table(clear_phone)
  select   REGEXP_REPLACE(phone_number, '[^0-9]', '',1, 0, 'm')  
  from phone;

  select distinct clear_phone from dummy_table;
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