Unqualified Object Names - Advanced SQL Engine - Teradata Database

An unqualified object name is a reference to an object such as a table, column, trigger, macro, or stored procedure that does not include parent objects. For example, the WHERE clause in the following statement uses “DeptNo” as an unqualified column name:

SELECT *
FROM Personnel.Employee
WHERE DeptNo = 100 ;

Unqualified Column Names

You can omit database and table name qualifiers when you reference columns as long as the reference is not ambiguous.

For example, the WHERE clause in the following statement:

SELECT Name, DeptNo, JobTitle
FROM Personnel.Employee
WHERE Personnel.Employee.DeptNo = 100 ;

can be written as:

WHERE DeptNo = 100 ;

because the database name and table name can be derived from the Personnel.Employee reference in the FROM clause.

Omitting Database Names

The search must find the name in only one of those databases. An ambiguous name error message results if the name exists in more than one of those databases.

For example, if your login user database has no volatile tables named Employee and you have established Personnel as your default database, you can omit the Personnel database name qualifier from the preceding sample query.