Sql 查找大写字符，然后添加空格

我买了一个SQL世界城市/州数据库。在状态数据库中，它将状态名称推到一起。例如：“北卡罗来纳州”或“南卡罗莱纳州”

SQL中是否有方法循环并查找大写字符并添加空格

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这样“北卡罗莱纳州”就变成了“北卡罗莱纳州”？

有几种方法可以实现这一点

使用模式和

为每种情况（例如，

REPLACE（在您的示例案例中，状态名称为'hC'，'hC'）

）链接最小语句。这似乎是一种攻击，但实际上可能会给您带来最好的性能，因为您的替换集非常小

创建此函数

if object_id('dbo.SpaceBeforeCaps') is not null
    drop function dbo.SpaceBeforeCaps
GO
create function dbo.SpaceBeforeCaps(@s varchar(100)) returns varchar(100)
as
begin
    declare @return varchar(100);
    set @return = left(@s,1);
    declare @i int;
    set @i = 2;
    while @i <= len(@s)
    begin
        if ASCII(substring(@s,@i,1)) between ASCII('A') and ASCII('Z')
            set @return = @return + ' ' + substring(@s,@i,1)
        else
            set @return = @return + substring(@s,@i,1)
        set @i = @i + 1;
    end;
    return @return;
end;
GO

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如果绝对无法创建函数，并且需要一次性创建函数，则可以使用递归CTE将字符串拆分（并在需要时同时添加空格），然后使用FOR XML重新组合字符。下面详细说明示例：

-- some sample data
create table #tmp (id int identity primary key, statename varchar(100));
insert #tmp select 'NorthCarolina';
insert #tmp select 'SouthCarolina';
insert #tmp select 'NewSouthWales';

-- the complex query updating the "statename" column in the "#tmp" table
;with cte(id,seq,char,rest) as (
    select id,1,cast(left(statename,1) as varchar(2)), stuff(statename,1,1,'')
      from #tmp
     union all
    select id,seq+1,case when ascii(left(rest,1)) between ascii('A') and ascii('Z')
                         then ' ' else '' end + left(rest,1)
         , stuff(rest,1,1,'')
      from cte
     where rest > ''
), recombined as (
  select a.id, (select b.char+''
                  from cte b
                 where a.id = b.id
              order by b.seq
                   for xml path, type).value('/','varchar(100)') fixed
    from cte a
group by a.id
)
update t
   set statename = c.fixed
  from #tmp t
  join recombined c on c.id = t.id
 where statename != c.fixed;

-- check the result
select * from #tmp

----------- -----------
id          statename
----------- -----------
1           North Carolina
2           South Carolina
3           New South Wales

---

就像你如何称呼PATINDEX功能我以前试过PATINDEX。无法让它用于查找大写字母。世界各国…所以它有很多数据。@cha-这是一种语言功能。你会怎么称呼它？不想冒犯你。只是有时候在我们的团队中，我们称bug为“未记录的功能”

-- some sample data
create table #tmp (id int identity primary key, statename varchar(100));
insert #tmp select 'NorthCarolina';
insert #tmp select 'SouthCarolina';
insert #tmp select 'NewSouthWales';

-- the complex query updating the "statename" column in the "#tmp" table
;with cte(id,seq,char,rest) as (
    select id,1,cast(left(statename,1) as varchar(2)), stuff(statename,1,1,'')
      from #tmp
     union all
    select id,seq+1,case when ascii(left(rest,1)) between ascii('A') and ascii('Z')
                         then ' ' else '' end + left(rest,1)
         , stuff(rest,1,1,'')
      from cte
     where rest > ''
), recombined as (
  select a.id, (select b.char+''
                  from cte b
                 where a.id = b.id
              order by b.seq
                   for xml path, type).value('/','varchar(100)') fixed
    from cte a
group by a.id
)
update t
   set statename = c.fixed
  from #tmp t
  join recombined c on c.id = t.id
 where statename != c.fixed;

-- check the result
select * from #tmp

----------- -----------
id          statename
----------- -----------
1           North Carolina
2           South Carolina
3           New South Wales