MySQL 提取字符和数字里面的数字

备注:测试数据库版本为MySQL 8.0

一.需求

测试数据准备:

mysql> create table test1(id int,str varchar(100));
Query OK, 0 rows affected (0.02 sec)

mysql> insert into test1 values (1,'abc123'),(2,'123abc'),(3,'1abc23'),(4,'abc'),(5,'123');
Query OK, 5 rows affected (0.01 sec)
Records: 5  Duplicates: 0  Warnings: 0

mysql> select * from test1;
+------+--------+
| id   | str    |
+------+--------+
|    1 | abc123 |
|    2 | 123abc |
|    3 | 1abc23 |
|    4 | abc    |
|    5 | 123    |
+------+--------+
5 rows in set (0.00 sec)

需要提取字符和数字里面的数字

二.解决方案

遍历MySQL字符，然后取出其中的数字

代码:

select id,cast(group_concat(c order by pos separator '') as unsigned)
         as mixed1
  from (
select v.id , v.str, iter.pos,substr(v.str,iter.pos,1) as c
  from test1 v,
       ( select id pos from t10 ) iter
where iter.pos <= length(v.str)
and   ascii(substr(v.str,iter.pos,1)) between 48 and 57
      ) y
group by id,str
order by 1

测试记录:

mysql> select * from t10;
+------+
| id   |
+------+
|    1 |
|    2 |
|    3 |
|    4 |
|    5 |
|    6 |
|    7 |
|    8 |
|    9 |
|   10 |
+------+
10 rows in set (0.00 sec)

mysql> select id,cast(group_concat(c order by pos separator '') as unsigned)
    ->          as mixed1
    ->   from (
    -> select v.id , v.str, iter.pos,substr(v.str,iter.pos,1) as c
    ->   from test1 v,
    ->        ( select id pos from t10 ) iter
    -> where iter.pos <= length(v.str)
    -> and   ascii(substr(v.str,iter.pos,1)) between 48 and 57
    ->       ) y
    -> group by id,str
    -> order by 1;
+------+--------+
| id   | mixed1 |
+------+--------+
|    1 |    123 |
|    2 |    123 |
|    3 |    123 |
|    5 |    123 |
+------+--------+
4 rows in set (0.00 sec)