The soil should not be soaking wet. 5. When the calendula seedlings are about 3 inches (7.62 cm) high, thin them so that the remaining plants are 8 to 12 inches (20.32 to 30.48 cm) apart. 6. Apply a thin layer of compost to the calendula plants in midsummer.
Home : Software Terms : Relational Database Definition. Relational Database. A relational database is a database model that stores data in tables. The vast majority of databases used in modern applications are relational, so the terms database and relational database are often used synonymously.
A relational database is based on the relational model developed by E.F. Codd. A relational database allows the definition of data structures, storage and retrieval operations and integrity constraints.hat this means is that if you know the value of attribute X, you can determine the value of attribute Y. The relational database model is based on the Relational Algebra. Which means that operations in the relational database model are based on Select, Project, Join, Intersect, Union, Difference, and Product.