SELECT Aggregate and UPDATE - SQL Server

Question

SQL Server初學者在這裏。我在SELECT/UPDATE語句中遇到了一些麻煩。我有一個包含訂單號列和行號列的表格。下面的select語句返回我想要的值。我想取得結果並將該號碼插入到訂單號匹配的同一張表中的一列中。我在想這個嗎？或者也許在考慮複雜性？ :)

SELECT 
    ORDNUM, COUNT(LINNUM) AS 'CountLines' 
    FROM [TableName] 
    WHERE STS = '3' AND DUEQTY < ONHAND AND STYPE = 'CU' 
    GROUP BY ORDNUM 

    UPDATE [TableName] 
    SET LNCNT = 'CountLines' 
    WHERE ORDNUM = ORDNUM 

在此先感謝您。 Ben

更新：我在下面使用Andomars解決方案，它工作得很好。謝謝大家的幫助。

Answer 1

使用SQL Server語法：

update tn 
set  LNCNT = SubQuery.CountLines 
from TableName as tn 
join (
     select ordnum 
     ,  count(linnum) as CountLines 
     from TableName 
     where sts = '3' 
       and DUEQTY < ONHAND 
       and STYPE = 'CU' 
     group by 
       ordnum 
     ) as SubQuery 
on  SubQuery.ordnum = tn.ordnum 

Answer 2

以下應爲SQL Server的工作：

with counts as 
(
    SELECT 
    ORDNUM, COUNT(LINNUM) AS 'CountLines' 
    FROM [TableName] 
    WHERE STS = '3' AND DUEQTY < ONHAND AND STYPE = 'CU' 
    GROUP BY ORDNUM 
) 

    UPDATE tn 
    SET tn.LNCNT = c.CountLines 
    FROM TableName tn 
    INNER JOIN counts as c 
    ON tn.OrderNum = c.OrderNum 

Answer 3

如果您在MS SQL你試過申報。

DECLARE @countlines INT 
SET @countlines = SELECT COUNT(LINNUM) FROM [AdvPickTicket] WHERE STS = '3' 
AND DUEQTY < ONHAND AND STYPE = 'CU' GROUP BY ORDNUM 
UPDATE [TableName] 
SET LNCNT = @countlines 
WHERE ORDNUM = ORDNUM 

Answer 4

試試這個

UPDATE [tablename] 
SET LNCNT = abb.CountLines 
FROM (SELECT 
    ORDNUM, COUNT(LINNUM) AS 'CountLines' 
    FROM [TableName] 
    WHERE STS = '3' AND DUEQTY < ONHAND AND STYPE = 'CU' 
    GROUP BY ORDNUM) AS abb