Relational Database Model: 1) The relational database model is developed by “ Edgar F. Codd ” at IBM in 1970. 2) The relational Database Model used the basic concept of a relation or table. 3) A table is a collection of records and each record in a table Contains the same fields. 4) Every row or entity (called Tuple) must have a unique identification or key based on the data. What is Data Base Model 5) The different tables may have the common column name (Attribute), but a single table must not Contain multiple columns (Attributes) with the same name. 6) The relationship between the two tables is implemented using a common and unique attribute in the tables. 7) Columns are attributes that belong to the entity modeled by the table. 8) order of rows (tuples/entity) and columns (attributes) is not important. 9) But every Tuple must be unique. It means that for every record or Tuple in a table there is something that uniquely identified ¡t from any ot...



