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Update readme.md (#2197)

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content/roadmaps/107-nodejs/content/110-nodejs-databases/100-relational/readme.md
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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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