What is data link in Oracle Reports?

What is data link in Oracle Reports?

A data link is a data model object that enables you to relate multiple queries. For a simple group report, you relate the two queries using the primary and foreign keys of the tables from which you are selecting data. A primary key is a column for which each value uniquely identifies the record in which it is found.

How do you define a data link between queries?

In the data template, there are two methods for linking queries: using bind variables or using the element to define the link between queries. The element has a set of attributes. Use these attributes to specify the required link information. You can specify any number of links.

What is data model in Oracle Reports?

A database column represents a column that is selected by the query, containing the data values for a report. For each column that you select in your query, Oracle Reports Builder automatically creates a column in the data model of your report.

What is data link in Oracle Apps?

Data Links are used to establish parent-child relationships between queries and groups via column matching. A data link causes the child query to be executed once for each instance of its parent group. The child query is executed with the values of the primary key used by the parent.

What is a summary column and formula column in Oracle Reports?

Summary columns are used for calculating summary information like sum, average etc,. on specific columns of a data group. This column uses a set of predefined oracle aggregate functions. Summary columns are generally preceded by CS_ to distinguish them from other columns.

What is data definition and layout template?

The data template is the method by which you communicate your request for data to the data engine. It is an XML document whose elements collectively define how the data engine will process the template to generate the XML. The data engine supports the following functionality: Single and multiple data queries.

How do I create a report manually in Oracle Report Builder?

Launch Reports Builder (or, if already open, choose File > New > Report). In the Welcome or New Report dialog box, select Build a new report manually, then click OK. Your new report displays in the Object Navigator as something like MODULE 2. You will also see the Data Model view of your new report.

How do I find db links?

Any user can query USER_DB_LINKS to determine which database links are available to that user. Only those with additional privileges can use the ALL_DB_LINKS or DBA_DB_LINKS view.

What is placeholder column?

A placeholder column is an empty container at design time. The placeholder can hold a value at run time that has been calculated and placed into it by PL/SQL code from another object. Using placeholder columns, you can: Populate multiple columns from one piece of code.

What is a formula column in Oracle?

Formula Column: A formula column is a user-created column that gets its data from a PL/SQL function or expression, a SQL statement, or a combination of these. A formula column performs a user-defined computation on the data of one or more column(s), including placeholder columns.

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