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?
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;