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A proprietary Oracle join syntax has evolved that is stable and understood by millions of users This traditional syntax is supported by Oracle and is present in software systems across the world This syntax performs a Cartesian product, and then filters the result with a WHERE clause while the ANSI syntax joins the tables first, and then any separate WHERE clause conditions are applied to the joined results set You will no doubt encounter the traditional Oracle join syntax that is now making way for the standardized ANSI-compliant syntax discussed in this chapter The traditional Oracle join syntax supports natural joining, outer joins, and Cartesian joins, as shown in the following queries: Query 1: select regionsregion_name, countriescountry_name from regions, countries where regionsregion_id=countriesregion_id; Query 2: select last_name, department_name from employees, departments where employeesdepartment_id (+) = departmentsdepartment_id; Query 3: select * from regions,countries; Query 1 performs a natural join by specifying the join as a condition in the WHERE clause This is the most significant difference between the traditional and ANSI SQL join syntaxes Take note of the column aliasing using the TABLECOLUMN_NAME notation to disambiguate the identical column names This notation is discussed later in this chapter Query 2 specifies the join between the source and target tables as a WHERE condition with a plus symbol enclosed in brackets (+) to the left of the equal sign that indicates to Oracle that a right outer join must be performed This query returns employees LAST_NAME and their matching DEPARTMENT_NAME values In addition, the outer join retrieves DEPARTMENT_NAME from the rows with DEPARTMENT_ID values not currently assigned to any employee records Query 3 performs a Cartesian or cross join by excluding the join condition EXAM TIP The traditional Oracle join syntax is widely used However, the exam assesses your understanding of joins and the ANSI SQL forms of its syntax Be prepared, though: some questions may tap your knowledge of the traditional syntax.

Prior to Oracle 9i, the traditional join syntax was the only language available to join tables Since then, Oracle has introduced a new language that is compliant to the ANSI SQL:1999 standards It offers no performance benefits over the traditional syntax Natural, outer, and cross joins may be written using both SQL:1999 and traditional Oracle SQL The general form of the SELECT statement using ANSI SQL:1999 syntax is as follows: PART II

SELECT table1column, table2column FROM table1 [NATURAL JOIN table2] | [JOIN table2 USING (column_name)] | [JOIN table2 ON (table1column_name = table2column_name)] | [LEFT | RIGHT | FULL OUTER JOIN table2 ON (table1column_name = table2column_name)] | [CROSS JOIN table2];

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This is dissected and examples are explained in the following sections The general form of the traditional Oracle-proprietary syntax relevant to joins is as follows:

SELECT table1column, table2column FROM table1, table2 [WHERE (table1column_name = table2column_name)] | [WHERE (table1column_name(+)= table2column_name)] | [WHERE (table1column_name)= table2column_name) (+)] ;

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If no joins or fewer than N 1 joins are specified in the WHERE clause conditions, where N refers to the number of tables in the query, then a Cartesian or cross join is performed If an adequate number of join conditions is specified, then the first optional conditional clause specifies an equijoin, while the second two optional clauses specify the syntax for right and left outer joins

Columns with the same names may occur in tables involved in a join The columns named DEPARTMENT_ID and MANAGER_ID are found in both the EMPLOYEES and DEPARTMENTS tables The REGION_ID column is present in both the REGIONS and COUNTRIES tables Listing such columns in a query becomes problematic when Oracle cannot resolve their origin Columns with unique names across the tables involved in a join cause no ambiguity, and Oracle can easily resolve their source table The problem of ambiguous column names is addressed with dot notation A column may be prefixed by its table name and a dot or period symbol to designate its origin This differentiates it from a column with the same name in another table Dot notation may be used in queries involving any number of tables Referencing some columns using dot notation does not imply that all columns must be referenced in this way Dot notation is enhanced with table aliases A table alias provides an alternate, usually shorter name for a table A column may be referenced as TABLE_NAME COLUMN_NAME or TABLE_ALIASCOLUMN_NAME Consider the query shown in Figure 12-3

Figure 12-3

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