--In SQL Server, NULL value indicates an unavailable or unassigned value. The value NULL does not equal zero (0), nor does it equal a space (' '). Because the NULL value cannot be equal or unequal to ...

1．はじめに SQLを書いていて「おかしいな、ちゃんと条件を書いてるのに結果が返ってこない…」と思ったことはありませんか？ もしかするとその原因は、「NULLと空白の違い」にあるかもしれません。

The lack of information within relational databases expressed as NULL values presents a problem in ensuring the quality of data and the information retrieved by SQL queries. This is so because there ...

I'm trying to put together a DTS package to export data from SQL Server (2k) into a CSV file that I can in turn import into MySQL.The problem I'm running into is SQL Server exports NULL values as ...