SQL服务器 - 删除多列具有null值或零值的行

Question

我是一个DB新手,我正在努力解决这个问题.我有一个包含以下列的现有表:

Showroom, Salesperson, Time1, Time2, Time3, Dte

我正在尝试删除表中所有3个时间列中具有空值或零值的行.我尝试了以下方法:

DELETE FROM myTable 
WHERE EXISTS(
              SELECT * 
              FROM myTable 
              WHERE (Time1 IS NULL OR Time1 = 0) 
                AND (Time2 IS NULL OR Time2 = 0) 
                AND (Time3 IS NULL OR Time3 = 0)
            )

值得庆幸的是,我正在研究数据库的测试版本,因为我删除了所有数据.真的很感激任何帮助.

Answer 1

查询应格式如下:

DELETE 
FROM myTable 
WHERE (Time1 IS NULL OR Time1 = 0) 
AND (Time2 IS NULL OR Time2 = 0) 
AND (Time3 IS NULL OR Time3 = 0)

在做DELETE陈述,我认为这是最好总是先创建SELECT语句,然后改变它.

SELECT * --If this returns the correct records, simply change to DELETE
FROM myTable 
WHERE (Time1 IS NULL OR Time1 = 0) 
AND (Time2 IS NULL OR Time2 = 0) 
AND (Time3 IS NULL OR Time3 = 0)

Answer 2

你想要的只是；

DELETE myTable
WHERE
  (Time1 IS NULL OR Time1 = 0)
  AND (Time2 IS NULL OR Time2 = 0)
  AND (Time3 IS NULL OR Time3 = 0)