Annotated Bibliography On Hierarchical Database - 3450 Words

Hierarchical Database It is a kind of database model which is designed in a hierarchy completely access to data beginning at the highest of hierarchical then changes to down such as customer to order. The hierarchical typical structure has levels which shows one –to – many also relationship between a parent and children divisions. The main key this models which following by each parent can have many children as well each child has simply one parent. This model is most common if it is compared with network and relational database because it can be manage by huge amounts of data for difficult projects. Advantages †¢ Speed very efficiency †¢ Data independence †¢ Database integrity which link between child and parent †¢ Data is simplicity †¢Ã¢â‚¬ ¦show more content†¦it is a collection of data items organised as a set of formally described tables from what data can be accessed. The application standard to use this kind of database is the structured query language (SQL).This statements are used for both communication with queries for information from a relational database this schema set of tables contain data built into predefined categories. Each table contains one or more data categories in columns, each row contains a unique instance of data for the categories defined by the columns. A relational database Management system (RDBMS) is the physical and logical implementation of a relational