Question

我有一张表如下。

Name         Null         Type          
-----------  --------     -------------- 
EMPLOYEEID   **NOT NULL** NUMBER         
NAME         **NOT NULL** VARCHAR2(1000) 
AGE          *NOT NULL*   NUMBER         
SALARY                    NUMBER        
DELETEDFLAG               NUMBER(1)

我编写了MERGE语句来插入，更新，删除记录，如下所示。

MERGE INTO EMPLOYEE tgt USING  (
SELECT( SELECT EMPLOYEE.rowId as rid  from EMPLOYEE WHERE employeeid = 70) as rid from dual ) src ON (tgt.rowid = src.rid)
WHEN MATCHED THEN UPDATE SET  name = 'PSS', age = 25, salary = 2589
WHERE employeeid = 70
DELETE WHERE DELETEDFLAG = 1
WHEN NOT MATCHED THEN
INSERT (employeeId, name, age, salary, deletedFlag) VALUES( 70, 'TSS', 28, 15000, 0);

删除记录时我遇到了问题。当我收到name，name和salary的null值并且deleteFlag为零时，我想删除记录。我只知道employeeID。 MERGE查询如下。

MERGE INTO EMPLOYEE tgt USING  (
SELECT( SELECT EMPLOYEE.rowId as rid  from EMPLOYEE WHERE employeeid = 70) as rid from dual ) src ON (tgt.rowid = src.rid)
WHEN MATCHED THEN UPDATE SET  name = null, age = null, salary = null
WHERE employeeid = 70
DELETE WHERE DELETEDFLAG = 0
WHEN NOT MATCHED THEN
INSERT (employeeId, name, age, salary, deletedFlag) VALUES( 70, null, null, null, 0);

我遇到的问题是在这种情况下它会尝试更新记录。该名称不是nullable列，但它尝试使用null更新。所以得到了SQL错误。

无法将（％s）更新为NULL

如果我传递not null值，它按预期工作。

任何人都可以建议我如何处理这种情况？

Answer 1

将更新部分中的谓词更改为此

WHERE employeeid = 70 and DELETEDFLAG <> 0

如果DELETEDFLAG可以为null，我假设您知道如何更改谓词

MERGE语句中的DELETE子句

1 个答案: