Question

我有这张桌子：

Name   ID State
====== == ============
sarah   1 arizona
daniel  2 california 
disney  3 Arizona 
dee     4 wyoming
eee     5 texas
ape     6 oklahoma
eee     7 kansas
csdsd   8 iowa
dfsdf   9 utah
deep   10 northdakota

我想在一组5中选择1个随机记录并将其放在不同的表中。可能吗？

例如，对于第一组（ID 1到5），我想选择任何ID。同样在第二组（6到10）中，我必须选择任何ID。

Answer 1

尝试这样的事情

insert dbo.bar ( Name, ID , State )
select t.Name , t.ID , t.State
from ( select *  ,
              rownum = row_number()
                      over ( partition by ID / 5 order by newid() ) 
       from dbo.foo
     ) t
where r.rownum = 1

另见问题Select first row in each GROUP BY group?

Answer 2

无论@YourTable中有多少条记录，此查询将为每5个ID随机选择1条记录。假设每条记录都有一个连续的ID。

-- load test data
declare @YourTable table(Name varchar(10),ID int identity(1,1), [State] varchar(20))
insert into @YourTable(Name,[State])
    values  ('sarah','arizona'),
            ('daniel','california'),
            ('disney','Arizona'),
            ('dee','wyoming'),
            ('eee','texas'),
            ('ape','oklahoma'),
            ('eee','kansas'),
            ('csdsd','iowa'),
            ('dfsdf','utah'),
            ('deep','northdakota')

-- randomly select 1 record from every 5 IDs
select ID,Name,[State]
from    (
        select ID,Name,[State],
            row_number() over(partition by (ID-1)/5 order by newid()) rnd
        from @YourTable
        ) r
where rnd = 1

Answer 3

在这里，我从表中获得前1条记录，只是为了从1-5条记录中选择记录。我希望这有帮助。我已将计数器设置为10，您可以将其设置为您想要的最大计数，并且我设置的增量为5.您可以根据需要更改它。

DECLARE @counter smallint;
SET @counter = 1;
WHILE @counter < 10
   BEGIN
      INSERT INTO NEWTABLE              --- your destination table
      ( NAME, ID, STATE)

      SELECT Top 1 * from yourtable where id  between @counter and @counter + 5 

      SET @counter = @counter + 5
   END;

来自群组的随机记录

3 个答案: