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.
The term relational database was invented by E. F. Codd at IBM in 1970. Codd introduced the term in his seminal paper A Relational Model of Data for Large Shared Data Banks. In this paper and later papers, he defined what he meant by relational. One well-known definition of what constitutes a relational database system is composed of Codd's 12 rules.