Geodesic
Codd’s Recommendations for Date Time Data Types and its implementations in ISO SQL, DB2, Oracle, and Transact-SQL
Serdica Journal of Computing, Tome 12 (2018) no. 4, pp. 247-264.

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Date and time data types are very important for the business. From the relational model data point of view, these data types are simply atomic domains - their structure and operations are unimportant. After the initial introduction of the relational model of data and the next following implementations based on that model, Codd, in the Version 2 of relational model of data, corrected his point of view introducing 14 recommendations about date and time data types. This paper investigate date and time data types implementations in ISO SQL, DB2, Oracle and Transact-SQL.
Keywords: Codd, SQL, Database 
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Dimitrov, Vladimir. Codd’s Recommendations for Date & Time Data Types and its implementations in ISO SQL, DB2, Oracle, and Transact-SQL. Serdica Journal of Computing, Tome 12 (2018) no. 4, pp. 247-264. http://geodesic.mathdoc.fr/item/SJC_2018_12_4_a2/