AI Airport Services Interview Questions and Answers

Optimizing a pipeline involves improving efficiency, reducing latency, and ensuring data quality throughout the data processing stages.

• 1. Identify bottlenecks: Use profiling tools to find slow stages in the pipeline, such as data loading or transformation.

• 2. Parallel processing: Implement parallel processing for tasks that can run simultaneously, like data extraction from multiple sources.

• 3. Data sampling: Use smaller datasets for testing and development to speed up iteration...read more

Indexes should be created on columns that are frequently used in WHERE, JOIN, and ORDER BY clauses.

• Indexes should be created on columns with high selectivity

• Indexes should not be created on columns with low cardinality

• Indexes should not be created on columns with frequent updates

• Composite indexes can be created on multiple columns

• Indexes can be created on virtual columns

Join operator is used to combine rows from two or more tables based on a related column between them.

• Join operator is used in SQL to retrieve data from multiple tables.

• It combines rows from two or more tables based on a related column between them.

• Types of join operators include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL OUTER JOIN.

• Join operator can be used with WHERE clause to filter the results.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.colum...read more

row_number() function assigns a unique number to each row within a result set.

• It is a window function in SQL

• It is used to generate a unique sequential number for each row in a result set

• It is often used for pagination and ranking purposes

• It can be used with ORDER BY clause to specify the order of the rows

Types of testing approaches include black box testing, white box testing, and grey box testing.

• Black box testing focuses on the functionality of the software without knowledge of its internal code.

• White box testing examines the internal logic and structure of the software.

• Grey box testing combines elements of both black box and white box testing.

• Other types include regression testing, usability testing, performance testing, and security testing.

Different testing methods include black box testing, white box testing, and grey box testing.

• Black box testing focuses on the functionality of the software without looking at its internal code.

• White box testing involves testing the internal code structure, paths, and branches.

• Grey box testing combines elements of both black box and white box testing.

• Other testing methods include regression testing, usability testing, and performance testing.