Update readme.md (#2197)

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Sion Kang
2022-10-07 16:05:36 +04:00
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# Relational
# Relational
A relational database is a (most commonly digital) database based on the relational model of data, as proposed by E. F. Codd in 1970. A system used to maintain relational databases is a relational database management system (RDBMS). Many relational database systems are equipped with the option of using the SQL (Structured Query Language) for querying and maintaining the database.
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