SQL服務器2008查詢與if語句或案例？

Question

這裏是我的數據：

liza 
liza 
liza 
alex 
alex 
alex 
liza 

我想更新此表的數據爲每名​​每次發生這樣的：

liza 4 
liza 4 
liza 4 
alex 3 
alex 3 
alex 3 
liza 4 

到目前爲止，我有：

update table set column2=count(name) group by name 

非常感謝您的幫助

Answer 1

update T1 set 
    Column2 = T2.C 
from YourTable as T1 
    inner join (
       select count(*) as C, Name 
       from YourTable 
       group by Name 
      ) as T2 
    on T1.Name = T2.Name 

樣品與變量表

declare @YourTable table 
(
    Name varchar(10), 
    Column2 int 
) 

insert into @YourTable (Name) values 
('liza'),('liza'),('liza'),('alex'),('alex'),('alex'),('liza') 

update T1 set 
    Column2 = T2.C 
from @YourTable as T1 
    inner join (
       select count(*) as C, Name 
       from @YourTable 
       group by Name 
      ) as T2 
    on T1.Name = T2.Name 

這裏試試吧。 http://data.stackexchange.com/stackoverflow/q/102392/update-with-count

這是使用CTE和count(*) over()的另一種方法。

declare @YourTable table 
(
    Name varchar(10), 
    Column2 int 
) 

insert into @YourTable (Name) values 
('liza'),('liza'),('liza'),('alex'),('alex'),('alex'),('liza') 

;with cte as 
(
    select Column2, 
     count(*) over(partition by Name) as C 
    from @YourTable   
) 
update cte set 
    Column2 = C 

而這個查詢，你可以在這裏試試。 http://data.stackexchange.com/stackoverflow/q/102394/update-with-count-2