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Joins in SQL combine rows from two or more tables based on a related column between them.
Joins are used to retrieve data from multiple tables based on a related column between them.
Common 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.
R...
Types of joins in SQL include inner join, outer join, left join, right join, and full join.
Inner join: Returns rows when there is a match in both tables
Outer join: Returns all rows when there is a match in one of the 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 r
I applied via Recruitment Consulltant and was interviewed in Jul 2023. There was 1 interview round.
I applied via Company Website and was interviewed before Oct 2022. There were 6 interview rounds.
Basic aptitude test , more focused on reasoning and problem solving skills.
Identify the defective cube out of 12 identical cubes using a weight balance in minimum rounds.
Divide the cubes into three groups of four each.
Weigh two groups against each other.
If they balance, the defective cube is in the third group.
If they don't balance, take the heavier group and weigh two cubes against each other.
If they balance, the defective cube is the remaining cube.
If they don't balance, the heavier cube is
IQVIA interview questions for designations
I applied via Approached by Company and was interviewed in Sep 2021. There were 2 interview rounds.
Agile ceremonies and Vlook up's demerit
Agile ceremonies are regular meetings held in Agile methodology to ensure effective communication and collaboration among team members.
Vlook up is a function in Excel used to search for a specific value in a table and return a corresponding value.
The demerit of Vlook up is that it only searches for exact matches and cannot handle errors or inconsistencies in data.
Agile ceremonies ...
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Autocorrelation is the correlation of a signal with a delayed copy of itself.
Autocorrelation is used to identify patterns in time series data.
It is a measure of how similar a signal is to a delayed version of itself.
Autocorrelation can be positive, negative, or zero.
It is commonly used in signal processing, finance, and econometrics.
Autocorrelation can be visualized using a correlogram.
Heteroscedasticity is a statistical term that refers to the unequal variance of a variable across different levels of another variable.
It is a violation of the assumption of homoscedasticity in regression analysis.
It can lead to biased and inefficient estimates of regression coefficients.
It can be detected through residual plots or statistical tests such as the Breusch-Pagan test.
Examples include income and expenditure...
Data analysis is affected by various factors that can influence the accuracy and reliability of the results.
Data quality: The accuracy, completeness, and consistency of the data can impact the analysis.
Data sources: The reliability and relevance of the data sources used for analysis can affect the outcomes.
Data preprocessing: The way data is cleaned, transformed, and prepared for analysis can impact the results.
Data in...
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