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Sathyam Cinemas Interview Questions and Answers

Updated 20 Nov 2024

Q1. Write SQL query for joining two tables

Ans.

SQL query for joining two tables

  • Use the JOIN keyword to combine rows from two or more tables based on a related column between them

  • Specify the columns to be retrieved using SELECT statement

  • Use ON keyword to specify the join condition

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Q2. Reverse the string

Ans.

Reverse a given string

  • Use a loop to iterate through the characters of the string and build a new string in reverse order

  • Alternatively, you can use built-in functions like reverse() or StringBuilder in some programming languages

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Q3. How do you detect a loop in a linked list?
Ans.

To detect a loop in a linked list, we can use the Floyd's Cycle Detection Algorithm.

  • Use two pointers - slow and fast, where slow moves one step at a time and fast moves two steps at a time.

  • If there is a loop, the two pointers will eventually meet at some point within the loop.

  • To detect the start of the loop, reset one pointer to the head and move both pointers one step at a time until they meet again.

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Q4. Different between delete truncate

Ans.

Delete removes rows from a table while truncate removes all rows from a table without logging individual row deletions.

  • Delete is a DML command while truncate is a DDL command.

  • Delete can be rolled back while truncate cannot be rolled back.

  • Delete triggers delete triggers and delete constraints while truncate does not trigger them.

  • Delete is slower than truncate as it logs individual row deletions.

  • Example: DELETE FROM table_name WHERE condition;

  • Example: TRUNCATE TABLE table_name;

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Q5. How would you implement merge sort on a linked list?
Ans.

Merge sort on a linked list involves dividing the list into halves, sorting each half, and then merging the sorted halves.

  • Divide the linked list into two halves using slow and fast pointers

  • Recursively sort each half

  • Merge the sorted halves back together

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Q6. Difference between Relationship vs Join Vs Blending

Ans.

Relationships define how tables are related, joins combine data from two or more tables, and blending combines data from different data sources.

  • Relationships are defined in the database schema and determine how tables are related to each other.

  • Joins are used to combine data from two or more tables based on a common column or key.

  • Blending is used to combine data from different data sources, such as Excel spreadsheets or CSV files.

  • Relationships and joins are used in SQL queries...read more

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Q7. What are the different products from Tableau

Ans.

Tableau offers a range of products for data visualization and analytics.

  • Tableau Desktop - for individual users to create visualizations and dashboards

  • Tableau Server - for sharing visualizations and collaborating with others

  • Tableau Online - cloud-based version of Tableau Server

  • Tableau Prep - for data preparation and cleaning before visualization

  • Tableau Public - free version for sharing visualizations publicly

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