Question

很多新的Sql循环＆amp;游标迫切需要推动。请指导我。

With tbl as (
select empcode, refid
from tbltrans where date < getdate()
group by empcode, refid
)

select r.empcode, r.refid, sum(t.debit)debit, sum(t.credit)credit, 
(sum(t.credit)- sum(t.debit))balance
from ref r
left join tbltrans t on r.empcode = t.empcode and r.refid = t.refid
group by r.empcode, r.refid

以上查询结果如下：

empcode    refid    debit   credit    balance    
----------------------------------------------
e1           r1      0        5         5
e1           r2      2        6         4
e2           r3      3        2         -1

现在，我必须插入带有相关借方值的新记录，以使余额为0，即

empcode    refid    debit   credit  
-----------------------------------
e1           r1      5        0    
e1           r2      4        0    
e2           r3      -1       0

我该怎么办？这就是我能想到的。

DECLARE @empcode nvarchar(11) , @refid nvarchar(11)
DECLARE c1 CURSOR READ_ONLY
FOR 
 //The above t-sql query here
OPEN c1 
FETCH NEXT FROM c1 INTO @empcode
WHILE @@FETCH_STATUS = 0 
BEGIN 
 Insert into tbltransactions values(@empcode, @refid, @somevaluefordebit, 0)

FETCH NEXT FROM c1 INTO @empcode
END CLOSE c1 
DEALLOCATE c1

Answer 1

不需要游标或循环：

INSERT INTO tbltransactions(empcode, refid, debit, credit)
SELECT  empcode,
        refid,
        balance,
        0
FROM tbltransactions

t-sql中的循环和游标

1 个答案: