A database is an orderly collection of structured data that is commonly stored in a computer system. The database is typically managed by a database management system (DBMS). The combination of the data and the DBMS, along with the associated applications, is known as a database system or simply a database. In modern databases, data is typically arranged in tables with rows and columns, enabling efficient processing and data querying. This data can be accessed, managed, modified, updated, controlled, and organized with ease. Structured Query Language (SQL) is used in m ost databases for writing and querying data. Advantages of Databases Minimum data redundancy Improved data security Increased consistency Lower updating errors Reduced costs of data entry, data storage, and data retrieval Improved data access using host and query languages Higher data integrity from application programs Concept of databases A foreign key is a column or a set of columns in a table that refers to the prima...