The database does not understand all capital letters In an Oracle database, why would the following table name not be allowed ‘EMPLOYEE JOBS’? Underscores “_” are not allowed in table namesĦ. Table names must start with an alphabetic character Numbers cannot be incorporated into table names
Why would this table name NOT work in an Oracle database? Attributes become columns in a database table. Relationships in the ER diagram become _, and primary unique identifiers become _.Ĥ. The transformation from an ER diagram to a physical design involves changing terminology.
In a physical data model, a relationship is represented as a:ģ. In a physical data model, an entity becomes a _.Ģ. Test: Quiz: Basic Mapping: The Transformation Processġ. The explanation below defines which constraint type:Ī primary key must be unique, and no part of the primary key can be null. The value in the dept_no column of the EMPLOYEES table must match a value in the dept_no column in the DEPARTMENTS table.Ĭolumns always containing positive numbers.Ĭolumns always containing values consistent with the defined data format.Ĭolumns always containing text data less than 255 characters.ġ0. The explanation below is an example of what constraint type: The explanation below defines which constraint type:Ī column must contain only values consistent with the defined data format of the column.Ĩ. A table does not have to have a primary key. One or more columns in a primary key can be null. Identify all of the correct statements that complete this sentence: A primary key is: (Choose Three)Ī single column that uniquely identifies each row in a table.Ī set of columns that uniquely identifies each row in a table.Ī set of columns and keys in a single table that uniquely identifies each row in a single table.ĥ. A foreign key always refers to a primary key in the same table. If the value in the balance column of the ACCOUNTS table is below 100, we must send a letter to the account owner which will require extra programming to enforce.ģ. Test: Quiz: Introduction to Relational Database ConceptsĢ.