I conducted a Twitter poll last week about how to spell DATATYPE (or is it DATA TYPEs?).  Many compound words start out as two separate words, then get hyphenated, then concatenated to a new word.  We saw this with:

data base –> data-base –> database

I keep seeing data types spelled both ways (and never as data-type).

Ted Codd used DATA TYPE in his 12 Rules for a Relational Database Product.

Embarcadero ER/Studio and CA ERwin Data Modeler use DATATYPE in their products and occasionally use DATA TYPE in their help or documentation.

Oracle uses both spellings in their documentation.  Microsoft sticks heavily to DATA TYPE.

Twitter polls last for 24 hours and not all clients can see or vote on them. So consider this more of a fun question on social media.

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How do you spell this concept? Are there other words you find with a variety of spellings?