Eucloid Data Solutions Lead Consultant Interview Questions and Answers

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

• SQL joins are used to retrieve data from multiple tables based on a related column between them

• Types of SQL 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 ...read more

Window functions are used to perform calculations across a set of table rows related to the current row.

• Window functions include ROW_NUMBER, RANK, DENSE_RANK, NTILE, LAG, LEAD, FIRST_VALUE, LAST_VALUE, and more

• They allow for calculations to be performed on a specific subset of rows within a query result set

• Window functions are commonly used in analytical queries to calculate running totals, moving averages, and more

Anagrams are two strings that have the same characters in a different order.

• Check if the two strings have the same length.

• Sort the characters in both strings and compare if they are equal.

• Alternatively, count the frequency of characters in both strings and compare the counts.