GeoPITS Interview Questions and Answers

Tree Map visualizes hierarchical data using nested rectangles, while Heatmap displays data values using color gradients.

• Tree Map displays data hierarchically with nested rectangles, where the size and color represent different measures.

• Heatmap visualizes data values using color gradients, with darker colors indicating higher values.

• Tree Map is useful for showing hierarchical data structures, while Heatmap is effective for comparing values across categories.

• Example: Tree Map c...read more

Extract Data saves a snapshot of data in Tableau workbook, while Live Connection directly connects to data source.

• Extract Data creates a static copy of data in Tableau workbook, while Live Connection directly queries data source in real-time.

• Extract Data is useful for working offline or with small datasets, while Live Connection is ideal for large datasets or when data is frequently updated.

• Extract Data can improve performance as it reduces the need to query the data source r...read more

The order of execution of an SQL query involves multiple steps to retrieve data from a database.

• 1. Parsing: The SQL query is first parsed to check for syntax errors.

• 2. Optimization: The query optimizer creates an execution plan to determine the most efficient way to retrieve data.

• 3. Compilation: The optimized query is compiled into an executable form.

• 4. Execution: The compiled query is executed by the database engine to retrieve the requested data.

• 5. Fetching: The retrieved d...read more

Data Validation in Excel ensures that data entered in a cell meets certain criteria or conditions.

• Data Validation allows you to set rules for what can be entered in a cell, such as a range of values, a list of items, or a custom formula.

• Examples of Data Validation include setting a drop-down list of options for a cell, restricting input to a certain number range, or ensuring dates are entered in a specific format.

• Data Validation helps maintain data accuracy and consistency in...read more

Joins in SQL are used to combine rows from two or more tables based on a related column between them.

• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• INNER JOIN returns rows when there is at least one match in both tables

• LEFT JOIN returns all rows from the left table and the matched rows from the right table

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table

• FULL JOIN returns rows when there is a match in one of the t...read more

A pivot table in Excel is a data summarization tool that allows you to reorganize and summarize selected columns and rows of data.

• Pivot tables allow you to analyze and summarize large amounts of data in a spreadsheet.

• You can easily rearrange the layout of the data to view it from different perspectives.

• Pivot tables can perform functions like sum, average, count, and more on the data.

• They are useful for creating reports, charts, and dashboards based on the summarized data.

• For ...read more

Primary key uniquely identifies each record in a table, while Unique key allows only unique values but can have null values.

• Primary key enforces uniqueness and not null constraint on a column

• Primary key can consist of multiple columns

• Unique key allows only unique values but can have null values

• Unique key can be applied to multiple columns as well

Use conditional formatting to highlight odd cells in Excel

• Select the range of cells you want to highlight

• Go to the 'Home' tab and click on 'Conditional Formatting'

• Choose 'New Rule' and select 'Use a formula to determine which cells to format'

• Enter the formula '=MOD(A1,2)=1' (assuming A1 is the top-left cell of your selected range)

• Choose the formatting style you want for the odd cells