Joined Tables - Teradata Database - Teradata Vantage NewSQL Engine

These options enable the FROM clause to specify that multiple tables be joined.

joined_table

Name of a joined table, which can be either a single table name with optional alias name, or a joined table, indicating nested joins.

INNER

Join in which qualifying rows from one table are combined with qualifying rows from another table according to some join condition.

Inner join is the default join type.

OUTER

Join in which qualifying rows from one table that do not have matches in the other table, are included in the join result along with the matching rows from the inner join. The rows from the first table are extended with nulls.

LEFT OUTER

Outer join with the table that was listed first in the FROM clause.

In a LEFT OUTER JOIN, the rows from the left table that are not returned in the result of the inner join of the two tables are returned in the outer join result and extended with nulls.

RIGHT OUTER

Outer join with the table that was listed second in the FROM clause.

In a RIGHT OUTER JOIN, the rows from the right table that are not returned in the result of the inner join of the two tables are returned in the outer join result and extended with nulls.

FULL OUTER

Rows are returned from both tables

In a FULL OUTER JOIN, rows from both tables that have not been returned in the result of the inner join will be returned in the outer join result and extended with nulls.

JOIN

Introduction to the name of the second table to include in the join.

ON search_condition

One or more conditional expressions, including scalar subqueries, that must be satisfied by the result rows.

You can only specify a scalar UDF for search_condition if it is invoked within an expression and returns a value expression.

If you specify the value for a row-level security constraint in a search condition, it must be expressed in its encoded form.

An ON condition clause is required if the FROM clause specifies an outer join.

CROSS JOIN

Unconstrained, or Cartesian, join. Returns all rows from all tables specified in the FROM clause. Two joined tables can be cross joined.

single_table

Name of a single base or derived table or view on a single table to be cross joined with joined_table.