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Not null or null
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作者: whitechief(http://whitechief.itpub.net)
发表于: 2004.12.19 14:31
分类: 计算机技术
出处: http://whitechief.itpub.net/post/1825/10765
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发表于: 2004.12.19 14:31
分类: 计算机技术
出处: http://whitechief.itpub.net/post/1825/10765
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When designing a database, you should decide each column is null or not.
NOT NULL if possible. It makes everything faster and you save one bit per column. If you really need NULL in your application, you should definitely use it. Just avoid having it on all columns by default. 
