barcode generator in vb.net 2005 PART II in Software

Painting QR Code ISO/IEC18004 in Software PART II

PART II
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Note in this case (a left outer join), the child table (SALESREPS, the table with the foreign key) is the major table, and the parent table (OFFICES) is the minor table. The objective is to retain rows containing NULL foreign key values (like Tom Snyder s) from the child table in the query results, so the child table becomes the major table. It doesn t matter
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whether the query is actually expressed as a left outer join (as just shown) or if it is flipped to become a right outer join like this: List the salespeople and the cities where they work.
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SELECT NAME, CITY FROM OFFICES RIGHT OUTER JOIN SALESREPS ON 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 LEFT OUTER JOIN SALESREPS ON OFFICE = REP_OFFICE; CITY -----------New York New York Chicago Chicago Chicago Atlanta Los Angeles Los Angeles Denver Dallas NAME -------------Mary Jones Sam Clark Bob Smith Paul Cruz Dan Roberts Bill Adams 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 ensure 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
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7:
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Multitable Queries (Joins)
(when SALESREPS was the major table), is missing from this set of query results because SALESREPS is now the minor table.
Older Outer Join Notation*
Because the outer join was not part of the original SQL standard and was not implemented in early IBM SQL products, the DBMS vendors who pioneered support for the outer join each invented their own notation for expressing outer joins. Users of these products began to develop programs that used these proprietary outer join capabilities, creating an installed base of user-written programs that depended on the specific Oracle or SQL Server notation. The writers of the SQL2 standard wanted to add outer join support in a way that would not break these existing programs, so they could coexist with new, standards-based programs. All of the major vendors now support some or all of the SQL standard outer join notation, and they encourage its use. However, you may encounter older programs that use the older proprietary forms, so they are described here. SQL Server supported outer joins in its early implementations from Sybase and continued to support outer joins after it was adopted by Microsoft. The SQL Server notation appends an asterisk (*) to the equal sign in the comparison test in the WHERE clause that defines the join condition. So this full outer join between the GIRLS and BOYS tables, expressed using the SQL standard notation: List girls and boys in the same city, including any unmatched girls or boys.
SELECT * FROM GIRLS FULL OUTER JOIN BOYS ON GIRLS.CITY = BOYS.CITY;
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