This is the middle layer of the database, the logical expression of the entire database, pointing out that the logical connection between the logical definition of all data and the data storage is a collection of records
This is the middle layer of the database, a logical representation of the entire database, stating that the logical connection between the logical definition of all data and the data store is a collection of records
This is the middle layer of the database and the logical expression of the whole database. It points out that the logical connection between the logical definition of all data and the data storage is the collection of records