如何在SQL

Question

当我尝试获取三列的总和作为总数时，如果在Recieved，Claim或Issue中某一列为null，则为null

SELECT YarnId,
Recieve,
Issued,
Claim,
Total=Recieve+Issued
FROM
(
SELECT YarnId,Status,Bags
FROM Yarn_IssueRecieve
) as PivotData

Pivot
(
SUM(bags) for Status in (Recieve,Issued,Damage,Claim)
) as Pivoting

以下是输出

Answer 1

使用COALESCE

Total= COALESCE (Recieve,0) + COALESCE (Issued,0)

和

SUM( COALESCE (bags,0) )

Answer 2

您可以使用ISNULL

SELECT YarnId,
Recieve,
Issued,
Claim,
Total=ISNULL(Recieve,0)+ISNULL(Issued,0)
FROM
(
SELECT YarnId,Status,Bags
FROM Yarn_IssueRecieve
) as PivotData

Pivot
(
SUM(bags) for Status in (Recieve,Issued,Damage,Claim)
) as Pivoting

Answer 3

在MySql或MSSQL Server中，如果添加任何带NULL的数字，则结果为NULL。例如-

SELECT 10 + NULL
--Result is NULL

因此，您可以在查询中使用NULL来解决所面临的问题。您可以根据需要使用COALESCE，脚本应如下所示-

Total=COALESCE(Recieve,0)+COALESCE(Issued,0)