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major table in the outer join. It doesn t matter whether the query is actually expressed as a left outer join (as it was previously) or as a right outer join like this: List the salespeople and the cities where they work.
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SELECT NAME, CITY FROM SALESREPS, OFFICES WHERE OFFICE =* REP_OFFICE NAME -------------Tom Snyder Mary Jones Sam Clark Bob Smith Paul Cruz Dan Roberts Bill Adams Sue Smith Larry Fitch Nancy Angelli CITY -----------NULL New York New York Chicago Chicago Chicago Atlanta Los Angeles Los Angeles Denver
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What matters is that the child table is the major table in the outer join. There are also useful joined queries where the parent is the major table and the child table is the minor table. For example, suppose the company in the sample database opens a new sales office in Dallas, but initially the office has no salespeople assigned to it. If you want to generate a report listing all of the offices and the names of the salespeople who work there, you might want to include a row representing the Dallas office. Here is the outer join query that produces those results: List the offices and the salespeople who work in each one.
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SELECT CITY, NAME FROM OFFICES, SALESREPS WHERE OFFICE *= REP_OFFICE CITY -----------New York New York Chicago Chicago Chicago Atlanta NAME -------------Mary Jones Sam Clark Bob Smith Paul Cruz Dan Roberts Bill Adams
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Sue Smith Larry Fitch Nancy Angelli NULL
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In this case, the parent table (OFFICES) is the major table in the outer join, and the child table (SALESREPS) is the minor table. The objective is to insure that all rows from the OFFICES table are represented in the query results, so it plays the role of major table. The roles of the two tables are precisely reversed from the previous example. Of course, the row for Tom Snyder, which was included in the query results for the earlier example (when SALESREPS was the major table), is missing from this set of query results because SALESREPS is now the minor table.
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RETRIEVING DATA
Outer Join Notation *
Because the outer join was not part of the SQL1 standard and was not implemented in early IBM SQL products, the DBMS vendors who support the outer join have used various notations in their SQL dialects. The *=* notation used in the earlier examples of this section is used by SQL Server. This notation indicates an outer join by appending an asterisk (*) to the comparison test in the WHERE clause that defines the join condition. To indicate the full outer join between two tables, TBL1 and TBL2, on columns COL1 and COL2, an asterisk (*) is placed before and after the standard join operator. The resulting full outer join comparison test looks like this:
WHERE COL1 *=* COL2
To indicate a left outer join of TBL1 to TBL2, only the leading asterisk is specified, giving a comparison test like this:
WHERE COL1 *= COL2
To indicate a right outer join of TBL1 to TBL2, only the trailing asterisk is specified, giving a comparison test like this:
WHERE COL1 =* COL2
An outer join can be used with any of the comparison operators using the same notation. For example, a left outer join of TBL1 to TBL2 using a greater than or equal (>=) comparison would produce a comparison test like this:
WHERE COL1 *>= COL2
SQL: The Complete Reference
Oracle also supports the outer join operation but uses a different notation. This notation indicates the outer join in the WHERE clause by including a parenthesized plus sign following the column whose table is to have the imaginary NULL row added (that is, the minor table in the outer join). The left outer join of TBL1 to TBL2 produces a search condition that looks like this:
WHERE COL1 = COL2 (+)
and the right outer join of TBL1 to TBL2 produces a search condition that looks like this:
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