Read the text on ISO Relational tables.

Do a quality check on the ER model based on the quoted text and what you know about this subject. List constraints that are mentioned in the text but not modeled.

Practice: Table 1 "In a relational database system, data is stored in tables. Tables of a database user must have a unique name. A table must have at least one column. A column has a unique name within the table. A column must have a data type and may be Not Null. Tables can have one primary key and any number of unique keys. A key contains one or more columns of the table. A column can be part of more than one key. A table can have foreign keys. A foreign key always connects one table with another. A foreign key consists of one or more columns of the one table that refers to key columns of the other table. The sequence of columns within the key and foreign key is important." with FOREIGN KEY from TABLE # Name # Name with to referenced with in with KEY # Name PRIMARY of UNIQUE with teor from ASSOCIATION # Segno Min for in COLUMN # Name in USAGE in * Data Type of # Segno o Not Null to