将列更新为NULL将返回空列

Question

当我运行此查询时

UPDATE tblPlayer 
SET Salary = NULL, 
    Status = "1" 
WHERE PlayerId=123

而不是将薪水更新为NULL，而是更新为空值

如何获取NULL而不是空值？

Answer 1

您的代码与我合作

UPDATE tblPlayer 
SET    Salary = NULL, 
       Status = '1' 
WHERE  PlayerId = 123

我敢打赌，您SALARY的默认值为''

要更改列，请尝试此DDL

ALTER TABLE tblPlayer MODIFY Salary VARCHAR(15) NULL DEFAULT NULL;