Business Intelligence Consultant

Business Intelligence Consultant Interview Questions and Answers

Updated 29 May 2021

Q1. Write a query to display the duplicate records without using group by.

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Query to display duplicate records without using group by

Use self-join to compare records
Select records where the values match but the primary key is different
Example: SELECT a.* FROM table a, table b WHERE a.value = b.value AND a.id <> b.id

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stuff() replaces a specified number of characters with another string, while substring() extracts a portion of a string.

stuff() is used to replace a specified number of characters in a string with another string.
substring() is used to extract a portion of a string based on the starting and ending index.
stuff() can be used to mask sensitive data in a string, such as credit card numbers.
substring() can be used to extract a specific part of a string, such as the first name in a ...read more

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The connection string can be passed on runtime using various methods.

One way is to use a configuration file and read the connection string from it.
Another way is to pass the connection string as a parameter to the application.
The connection string can also be stored in a database and retrieved at runtime.
Using environment variables is also a common method to pass connection strings.
Connection strings can be encrypted and stored in a secure location, and then retrieved at runt...read more

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The 'FOR XML' command is used in SQL Server to generate XML output from a query result.

It allows transforming the result set of a query into XML format.
It can be used to generate XML documents for data exchange or integration purposes.
The 'FOR XML' command supports different modes like RAW, AUTO, EXPLICIT, and PATH.
It can be combined with other SQL Server features like joins, aggregations, and subqueries.
Example: SELECT * FROM Customers FOR XML AUTO, ELEMENTS

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Ans.

End to end architecture involves designing and implementing a complete solution, while people management involves leading and coordinating a team.

End to end architecture involves understanding the entire system and designing a solution that meets all requirements
People management involves leading and coordinating a team to ensure successful project delivery
Effective communication and collaboration are key to both end to end architecture and people management
Examples of end to...read more

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Data can be extracted from various sources like databases, APIs, flat files, etc. and transformed using ETL tools before loading into BI.

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Query optimization can be done by analyzing query execution plans, indexing, partitioning, and rewriting queries.

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Transaction property in SSIS ensures all tasks in a package are completed or rolled back as a single unit.

Transaction property is used to ensure data consistency in a package
If a task fails, all previous tasks are rolled back
If all tasks complete successfully, they are committed as a single unit
Transaction property can be set at package or container level
Supported isolation levels are Serializable, Repeatable Read, Read Committed, and Read Uncommitted