siliconpi
siliconpi

Reputation: 8297

Storing empty strings vs NULLs in MySQL database?

I have a PHP/MySQL application that stores "blank" values in some cases as '' (empty strings) and in other cases as NULLs.

Having this mixed format certainly causes a problem when comparing, so I’m wondering which one is the better storage mechanism? '' or NULL?

Upvotes: 5

Views: 2848

Answers (1)

Simone Gianni
Simone Gianni

Reputation: 11672

While this is confusing, actually you should store null for a number of reasons :

  1. Checking against null is usually faster than checking an empty string in most databases
  2. Null commonly means "i don't know", empty string means "I know : it's empty". It gives you better semantics.

Upvotes: 8

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