The QlikView table viewer is a graphical tool that QlikView developers use to visualize the QlikView data model.
The Qlikview Table Viewer is the ability to view the data inside QlikView tables in the data model. To view data (limited to the first 1000 rows in the table), left-click on the table title bar, and click on Preview. A dialog box displays the data fields in the selected table. This is useful when you are building a script, so you can check the outcomes for a particular change.
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In the following example, we are previewing the data fields in the Physician Order Facts table. This table has 17 rows, all of which are displayed in the dialog box.
If you want to go beyond previewing data in tables using Table Viewer, you can also view data in individual QVD files. There is a great third-party tool for doing just that: QViewer, or EasyQlik is a very fast and small footprint standalone file viewer for analyzing the QVD files.
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QlikView can view all data inside a QVD file (or partial data for large files), create date stamps, field duplicates, null values, and count basic aggregations. QViewer/ EasyQlik can also help you view data in a resident table, with an addition of a small code block inside the script. The free version is limited to previewing 50,000 rows per table, and the full-price version is unlimited. QViewer/ EasyQlik is available for download at https:// www.easyqlik.com/
Information density and subset ratios:
You can view information about each data field in a table in Table Viewer by placing your cursor on any data field in any table. A tooltip displays (as shown in the following screenshot) the information about the data field, consisting:
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Information density: This displays the percentage of rows in the table with values (none is null).
Subset ratio: This displays the percentage of distinct values in this table for the data field (out of all possible distinct values for the data field having in all tables).
Field comments (if any): These are added with the help of the Comment Field statement, as follows:
Comment fieldname with ‘any comment’;
Field tags: These may be auto-populated from the system (denoted by a preceding dollar sign $). Custom field tags may also be added and edited by navigating to Settings | Document .. | Tables | Fields | Edit Tags | Add. An example of the use of field tags is to mark fields as dimensions or measures.
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Vinod Kasipuri writes about various IT platforms such as QlikView, Qlik Sense, and Perl Scripting, at Mindmajix. He loves to explain the concepts he writes in simple terms. He is also engaged in researching trends in AngularJS and LabView. Reach out to him via LinkedIn and Twitter.