By Al Stevens
Presents all of the instruments had to write C++ database courses and discover the entire capability of the C++ object-oriented language, together with database basics and layout, database administration, development the software program, and extra. unique. (Advanced).
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Additional info for C++ Database Development: Featuring Parody the Persistent Almost-Relational Object Database Management System
This example demonstrates that the hierarchictivity property can be useful in addition to associativity and commutativity when using outer joins. 8 Conclusion The ANSI SQL outer join preserves data and corrects problems with earlier nonstandard outer joins. The ANSI SQL join syntax also has a separate ON or USING clause for each join type that requires them. These ON and USING clauses specify the join condition, and each use has its own scope of control. The ANSI SQL join syntax supports both the inner join and many other types Page 22 of join operations (LEFT, RIGHT, FULL, CROSS, UNION), which can be combined in any order.
The outer join technology presented can be safely applied because it is open and ANSI compatible, avoiding interface problems now and in the future. Since the inherent and direct processing of complex data structures is new to SQL, data structures, their semantics, and direct use with the ANSI SQL outer join are also well covered in this book to fully round out the outer join coverage and its many uses. The ANSI SQL join has many different join types and a very flexible syntax for specifying them that can significantly control its operation and affect its join result.
Expanding the view introduces right-sided nesting, and the outer join's syntax does support this for a seamless operation. 5. This capability and the additional features enabled by it are described further in Chapter 7. As mentioned earlier in this chapter, joins with ON and USING clauses can't have their join order changed by the use of parentheses. Their join order is solely determined by the placement of ON or USING join criteria clauses. 4 Example of LEFT outer join with right-sided nesting.
C++ Database Development: Featuring Parody the Persistent Almost-Relational Object Database Management System by Al Stevens