Oracle

Crystal Reports 9 on Oracle by Marie Annette Harper

By Marie Annette Harper

Discover connectivity recommendations, then delve into optimization equipment that may be carried out within the Crystal atmosphere, together with using SQL Expressions and SQL instructions. assurance comprises an execution plan, optimization of indexes, and aid of parsing, and Oracle-specific gains equivalent to exterior tables, Heterogeneous Connectivity, and Oracle Flashback. universal problems whilst utilizing Oracle are defined, and options supplied.

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Extra resources for Crystal Reports 9 on Oracle

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Equal right outer joins are identical to equal left outer joins except that all rows from the right-hand table are returned and matching left-hand table rows are merged. In equal full outer joins, rows with identical values in the join columns from each table are merged, rows from either table that did not have matches are also returned, and the missing columns are populated with null values. It is common to assume an equal join and omit the word equal when describing joins. Nonequal joins are similar to equal joins except that more than one row from the left-hand table may be joined to more than one row from the right-hand table.

If you link from a child table column that allows nulls, unless there is a null value in the corresponding parent table column, none of the rows with null foreign key values will be in the result set. Data Dictionary Views Oracle maintains certain system tables and views that describe the database itself. The tables are not directly accessible, but the system creates views that users can query to explore the database structure. These views are the data dictionary views. They are sometimes called “System” tables or “Catalog” tables.

If you want to specifically check for and filter null values, use IS NULL. If you want to compare two fields where one or both of them may contain null values, use NVL. IS NOT NULL is the negation of IS NULL. Linking on Nulls Understand the fields that you use for linking in Crystal Reports. If you link from a child table column that allows nulls, unless there is a null value in the corresponding parent table column, none of the rows with null foreign key values will be in the result set. Data Dictionary Views Oracle maintains certain system tables and views that describe the database itself.

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