Hudson's Bay Company Senior Analyst Interview Questions, Process, and Tips

Joins and subqueries are used in SQL to combine data from multiple tables and perform complex queries.

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

• Subqueries are queries nested within another query and can be used to retrieve data based on the result of the outer query.

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Example: SELECT * FROM t...read more

Dashboards from visualization tools are used to display key metrics and insights in a visually appealing and easy-to-understand format.

• Dashboards help in monitoring performance and identifying trends.

• They can be customized to show specific KPIs or metrics.

• Popular visualization tools include Tableau, Power BI, and Google Data Studio.

Join is a SQL operation 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 le...read more

UNION combines the results of two or more SELECT statements, while UNION ALL returns all rows including duplicates.

• UNION removes duplicate rows, UNION ALL does not

• UNION sorts the result set, UNION ALL does not

• UNION is slower than UNION ALL as it performs additional operations to remove duplicates

• Example: SELECT column1 FROM table1 UNION SELECT column1 FROM table2;

• Example: SELECT column1 FROM table1 UNION ALL SELECT col

Views and store procedures are database objects used in SQL to simplify complex queries and operations.

• Views are virtual tables created by a query, while stored procedures are precompiled SQL statements stored in the database.

• Views can be used to simplify complex queries by storing them as a virtual table, while stored procedures can be used to perform specific tasks or operations.

• Views are read-only, while stored proc...read more