SQL Server导入向导将NULL视为文字字符串'NULL' [英] SQL Server Import Wizard treats NULL as literal string 'NULL'

问题描述

当我尝试将.csv逗号分隔的平面文件导入Microsoft SQL Server 2008R2 64位实例时，对于字符串列，原始数据中的NULL变为文字字符串NULL，并且在我收到的数字列中导入错误。谁能请帮忙???在此先感谢！

When I attempt to import a .csv comma-delimited flat file into a Microsoft SQL server 2008R2 64-bit instance, for string columns a NULL in the original data becomes a literal string "NULL" and in a numeric column I receive an import error. Can anyone please help??? Thanks in advance!

推荐答案

将数据放入临时表，然后使用SQL代码插入生产表。

Put the data into a staging table and then insert to the production table using SQL code.

update table1
set field1 = NULL
where field1 = 'null'

或者如果你想做很多字段

Or if you want to do a lot of fields

update table1
    set field1 = case when field1 = 'null' then Null else Field1 End
      , field2 = case when field2 = 'null' then Null else Field2 End
      , field3 = case when field3 = 'null' then Null else Field3 End

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