SQL 服务器：删除具有特定长度的单词

Question

我需要从列中删除具有特定长度的单词。在我的例子中，我需要删除长度 <=2 的单词。我总共有100万条记录。

+---------------------------+------------------------+
| Input                     | Output                 |
+---------------------------+------------------------+
| Steel rod 10 X 15 MM      | Steel rod              |
+---------------------------+------------------------+
| Syringe SM B 2.5 ML       | Syringe 2.5            |
+---------------------------+------------------------+
| 3.5 ML Syringe Disposable | 3.5 Syringe Disposable |
+---------------------------+------------------------+
| Syringe Disposable 2.5 ML | Syringe Disposable 2.5 |
+---------------------------+------------------------+

甚至我也不需要输入描述栏中的数字。我有删除数字的功能。请指教

Answer 1

SQL 服务器的字符串处理功能很差。这可能是您在将数据加载到数据库时想要做的事情。

数据库中的一个解决方案是递归 CTE：

with cte as (
      select input, convert(varchar(max), input + ' ') as rest, convert(varchar(max), '') as output, 1 as lev
      from t
      union all
      select input,
             stuff(rest, 1, charindex(' ', rest), ''),
             (case when charindex(' ', rest) <= 3 then output
                   else output + left(rest, charindex(' ', rest))
              end),
             lev + 1
      from cte
      where rest <> ''
     )
select input, output
from (select cte.*, max(lev) over (partition by input) as max_lev
      from cte
     ) cte
where lev = max_lev;

Here 是一个 db<>fiddle.

SQL 服务器：删除具有特定长度的单词

SQL Server: Remove words having specific length

sql

sql-server

sql-server-2014