Question

你能告诉我如何避免下面提到的例外吗？

 INSERT INTO [Migrated].[dbo].[Cities] (Name, ZipCode)
     SELECT DISTINCT 
         a.City, a.ZipCode 
     FROM
         [Legacy].[dbo].[Ziplist] AS a 
     WHERE
         (a.City IS NOT NULL AND a.ZipCode IS NOT NULL);

例外：

无法将值NULL插入列＆＃39; IsDeleted＆＃39;，table＆＃39; Migrated.dbo.Cities＆＃39 ;;列不允许空值。 INSERT失败。

Answer 1

正如@ jamieD77所述，您缺少插入语句中的IsDeleted列。

错误表示该列标记为＆＃34; NOT NULL＆＃34;因此，在创建新行时必须插入一个值。

因此，您需要自己从表中删除NULL约束，或在列中插入值。

 INSERT INTO [Migrated].[dbo].[Cities] (Name, ZipCode, IsDeleted)
 select  DISTINCT a.City,a.ZipCode,0 from [Legacy].[dbo].[Ziplist] as a where ( 
 a.City is not null and a.ZipCode is not null);

对于我认为是bit字段（但您应该确认！），值0将为false而1将为true }。如果字段是不同的数据类型，则这些值可能具有不同的含义!!!

Answer 2

错误消息的内容是[object Error] {description: "Unable to get property 'parentNode' of undefined or null reference", name: "TypeError", number: "-2146823281"}列已声明IsDeleted 且它没有默认值。在这种情况下，您可能默认插入未删除的记录，因此您可能希望更改列：

NOT NULL

或者，您可以编写查询以包含列：

alter table cities alter column IsDeleted int not null default 0;

这些答案假设INSERT INTO [Migrated].[dbo].[Cities] (Name, ZipCode, IsDeleted) select DISTINCT zl.City, zl.ZipCode, from [Legacy].[dbo].[Ziplist] zl where a.City is not null and a.ZipCode is not null;是一个整数，其中＆＃34; 0＆＃34;为假。如果值的存储方式不同，则需要对代码进行适当修改。

Answer 3

只需将列添加到插入列表和固定值即可选择列表。

INSERT INTO [Migrated].[dbo].[Cities] (Name, ZipCode, IsDeleted)
select  DISTINCT a.City,a.ZipCode, 0 IsDeleted --0 means false
  from [Legacy].[dbo].[Ziplist] as a 
    where (a.City is not null and a.ZipCode is not null);

无法将值NULL插入到使用Sql Select语句的列中

3 个答案: