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 - select the attribute based on the condition described by WHERE clause.
 
 # RDBMS ⌛
+
+- RDBMS stands for Relational Database Management System. 
+- RDBMS is the basis for SQL, and for all modern database systems like MS SQL Server, IBM DB2, Oracle, MySQL, and Microsoft Access.
+- A Relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd.
+- The data in an RDBMS is stored in database objects which are called as tables. 
+- This table is basically a collection of related data entries and it consists of numerous columns and rows.