During the menstrual cycle, an egg is released from one of the womanâs ovaries and travels down the fallopian tube. The egg only lives for 24 hours after ovulation, and a sperm must meet the egg within that period for pregnancy to happen.uring the menstrual cycle, an egg is released from one of the womanâs ovaries and travels down the fallopian tube. The egg only lives for 24 hours after ovulation, and a sperm must meet the egg within that period for pregnancy to happen.
A set of attributes is called a relation schema (or relation scheme). A relation schema is also known as table schema (or table scheme).A relation schema can be thought of as the basic information describing a table or relation. It is the logical definition of a table.Relation schema defines what the name of the table is. This includes a set of column names, the data types associated with each column. set of attributes is called a relation schema (or relation scheme). A relation schema is also known as table schema (or table scheme).
From Class Diagram to Relation Schema. Before you can define the database tables using a specific database management software and DDL (Data Definition Language), you must write a relation shema for each table. The set of relation schemas form the relational database schema which is used as input when defining the database.