Tableau Real Time Interview Questions By experts

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Q. What is the difference between context filter to other filters?

Whenever we crate context filter

·         Tableau will create a temporary table for this particular filter set and other filters will be apply on context filter data like cascade parameters… suppose we have crated context filter on countries >> we have chosen country as USA and India

·         Tableau will create a temporary table for this two countries data and if you have any other filers >>other will be apply on this two countries data if we don’t have any context filter

·         Each and individual record will check for all filters

Q. What is disadvantage of context filters?

·         The context filter is not frequently changed by the user – if the filter is changed the database must recomputed and rewrite the temporary table, slowing performance.

·         When you set a dimension to context, Tableau crates a temporary table that will require a reload each time the view is initiated. For Excel, Access and text data sources, the temporary table created is in an Access table format. For SQL Server, My SQL and Oracle data sources, you must have permission to create a temporary table on your server. For multidimensional data source, or cubes, temporary tables are not crated, and context filters only defined which filters are independent and dependent.

Q. What are the five main product offered by Tableau company?
Tableau offers five main products: Tableau Desktop, Tableau Server, Tableau Online, Tableau reader and Tableau Public.

Q. What is the current latest version of Tableau Desktop(as of Sep, 25th 2017)?

Current version: Tableau Desktop Version 10.4

Q. What is data visualization?
Data visualization refers to the techniques used to communicate data or information by encoding it as visual objects (e.g. points, lines or bars) contained in graphics.

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Q. Why tableau?
Whether your data is in an on-premise database, a database, a data warehouse, a cloud application or an Excel file, you can analyze it with Tableau. You can create views of your data and share it with colleagues, customers, and partners. You can use Tableau to blend it with other data. And you can keep your data up to date automatically.

Q. What are Filters? How many types of filters are there in Tableau?
Filter is nothing but it is restricted to unnecessary, it is showing exact data. Basically filters are 3 types.
1. Quick filter
2. Context filter
3. Datasource filter

Q. What is disaggregation and aggregation of data?
Suppose I have data like
Eid Ename Salary Dept
1.abc 2000 java
2.bbc 3000 .net
3.Krishna 2500 java
Madhu 300
5.Vamshi 3000 mainframes
1.abc 1000 testing
2.bbc 3000 tableau
3.krishna 5000.net
4.Madhu 7000 testing
vanshi 9000 tableau
1 abc 11000 Mainframes
2 bbc 13000testing
3 krishna 15000 java
4 Madhu 17000 .nte
5 vamshi 19000.net
Aggregation: to display aggregate data
Sum/avg salary by each individual employee
drag ename on columna and salary on rows we will get sum (salary) of each and individual employee
now change measure type as Avg
Choose salary option – choose measure types as “Avg”
Disaggregation: To display each and every transaction
When you look at the aggregated data in the views above, each bar represents all transactions for a specific employee summed up or averaged into a single value. Now say that you want to see the individual salary transactions for each employee. You can create a view like that by selecting Analysis>Aggregate Measures.

Q. How to remove the All options from a Tableau auto – filter?
Right click filter>>customize>>uncheck show all option

Q. Can we use non – used columns (Columns which are not used in reports but data source has columns) in Tableau Filters?
Yes!
Ex. In data source I have column like
empID, EmpName, EmpDept,EmpDsignation, EmpSalary
In reports I am using empname on columns and empsalry on rows.
I can use empDesignation on Filters

Q. What is benefit of Tableau extract file over the live connection?
Extract can be used anywhere without any connection and you can build your own visualizations without connecting to Database.

Q. How to combine two excel files with same fields but different data (different years)?
I have 5 different excel files (2007.xls, 2008.xls..2011.xls) with same fields (film name, genre, budge, rating, profitability) but with data from different year (2007 to 2011). Can someone tell me how can I combine the film name, genre and profitability so that I can see the visualization of 2007 to 2011 in a single chart?

Related Article: Employing Visual Analytics To Aid Succession Planning In Tableau

Q. Max no of tables we can join in Tableau?
We can join max 32 table, it’s not possible to combine more than 32 tables.

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