Tableau Interview Questions

• Transactions that we do regularly like day in and day out to run the regular business will come under OLTP (Online Transaction Processing). They will contain more detailed data. Few examples of transactional databases are SQL server, Oracle, DB2.
• Transactions that come under analysis part can be grouped into OLAP (Online Analytical Processing). These transactions take more time to execute the past data based on the requirements.
• Data set is classified into dimensions and measures. Dimensions are discrete in nature. Anything that is descriptive, which can be categorized, identified and qualitative in nature is called a dimension.
• Measure is continuous and quantitative in nature. Measure is something which adds weightage, and something which has a unit.
• Dimensions are shown in blue color and measures are associated with green color. Green color shows continuous representation and blue color will show discrete representation.
• Following are the filters for dimensions.
Inclusion Filters: Whatever field values we select, only that associated values will be shown on the view.
Exclusion Filters: Whatever fields we select, that values will not be shown in the view. It is exactly opposite to the inclusion filters.
Wildcard: Wildcard will to a string match. It is useful for filtering the data in dimensions using alphabets.
Condition Filter: It is helpful in filtering the data based on a specific condition. Top: Filter the data by the field by top 10/bottom 10. Or even Filter it using top "parameter"
Calculation Filter : When we use a dimension in the filter shelf and if that dimension is not used in any other shelves then it is called as a calculation filter.
Context Filter : All the filters work independently. Whenver a filter is set as a context filter then all the other filters will act on the data that passes through the context filter. i.e. they are dependent on the context filter.
• Filters are used when the end user/client want to show specific data from a specific dimension or measure. We can filter the data by applying a filter on the dimensions.
• Quick filter appears on the right side of the view whenever a filter is applied. It helps to select required filter option in the view itself instead of going to the filter shelf.
• In discrete representation, each value is independent of the other value. But in continuous, each value is dependent on the other.
• There are three types of axes: Individual axis, Blended axis and Dual axis.
1. We can go for an individual axis when both the measures have same/different units. As long as the axes are independent, there is no problem if the measures have same/different units.
2. We can use a blended axis if and only if both the measures have the same scale. So there is no problem as long as both the measures are weighed in terms of same units.
3. Dual axis, the name itself says both of the measures have different axes. We can go for a dual axis when both the measures have same/different scale.
• Cycle fields option is used to interchange whatever measures that are displayed on the rows shelf.
• Line Charts can be prepared when we want to show Discrete and Continuous representation. In order to generate a line chart, one date field is mandatory. And the dimension and measure that is required to generate a line chart are order date and profit. Line Charts help to perform analysis based on a time period.
• In order to build a Symbol Map and Filled Map, the mandatory field we need to have is one geographical dimension/member.
• In symbol map, we can use maximum two measures because we can just show variation on top of the state/region in terms of size as well as color for that particular shape.
• In Filled Map, we can use maximum one measure because whatever the region/location is present, it will be filled with color. But we cannot change the shape of the region/state. So, maximum we can show the variation only in color.
• Groups enables categorizing or clubbing the members within a single dimension. Hierarchies allow drilling down/through the data .e.g OrderDate has hierarchy created by default.
• Whenever the data in dataset is not matched with the maps data in tableau, we can go to edit locations and there we can see ‘unrecognized’ (in red color) next to the locations that are present in data set. Using edit locations option we can edit the locations in order to match with the data in data set. We can use the drop down menu to select a different name or we can enter the latitude or longitude values.
• We can convert dimension into measure and measure into a dimension in two ways. One way is to right click on the dimension/measure and click convert to measure/convert to dimension. And another way is just simply drag dimension on to the measures window or measure on to the dimensions window.
• In order to convert a line chart to an area chart, go to analysis menu and click stack marks and click on.
• Synchronize axis is used to make both right and left side axis values in sync with each other. It is used in dual axis where in we have single base and has right side and left side axis.
• In dual axis, both the measures are shown in mark lines. But in dual combination, one measure is shown in mark line and another measure in terms of mark bar.
• When we hover the mouse on the visualization, we can see small window that is popping out. It is called tool tip. Tool tip has some command buttons. When we click on the tool tip in marks card, a window appears. There we can check or uncheck include command buttons and click ok. If we check the include command button, then the command buttons are shown on tool tip. If we uncheck the include command buttons, then they are not shown on the tool tip.
• To change starting month for a fiscal year, right click on order date and select default properties and then go to fiscal year start, there we can select the month. This way we can select particular starting month for a fiscal year.
• When we right click on any sheet, there is an option called duplicate sheet. When we click that option, a duplicate sheet is created.
• A text table is created for a given sheet by right clicking on the sheet and selecting duplicate as crosstab.
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