Download Crystal Reports 9 on Oracle by Marie Annette Harper PDF
By Marie Annette Harper
Discover connectivity thoughts, then delve into optimization equipment that may be applied within the Crystal setting, together with using SQL Expressions and SQL instructions. assurance contains an execution plan, optimization of indexes, and aid of parsing, and Oracle-specific positive aspects corresponding to exterior tables, Heterogeneous Connectivity, and Oracle Flashback. universal problems while utilizing Oracle are defined, and strategies supplied.
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If you need to do this, the solution is to create an Oracle view containing the same query as the SQL Command and then use that to link to the main table in the main report. This works for all connection types. Nested Tables Nested tables can be treated the same as varrays for reporting purposes. You must use the TABLE command to unnest the table. Note Varrays and nested tables can be multidimensional in Oracle 9i. For example, you can create a varray of a varray type. Nulls The Oracle null value is an important concept for report writers to understand.
UNION ALL UNION ALL differs from UNION in one respect: UNION ALL will not remove duplicate rows. Because of this, UNION ALL is more efficient than UNION because it does not have to find and eliminate the duplicate rows, but it should be used only if you do not want duplicates eliminated, or if you are certain that there are no duplicates. No sort operation is required. INTERSECT INTERSECT returns rows only if they exist in both result sets.
Phone numbers for each of these entities is stored in a separate corresponding table. A UNION operation allows you to treat them as if they were all in the same table. SELECT 'Customer' Type, Customer_Name Organization, Contact_Last_Name Last_Name, Contact_First_Name First_Name, 58 Chapter 4: Oracle Advanced SELECT Options Chapter 4: Oracle Advanced SELECT Options 59 Phone FROM Customer UNION SELECT 'Employee', Null, Last_Name, First_Name, Home_Phone FROM Employee UNION SELECT 'Supplier', Supplier_Name, Null, Null, Phone FROM Supplier ORDER BY 3, 4 Note that the column names or aliases from the first SELECT statement are the ones used for the entire result set.