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fresher Engineer Interview Questions and Answers

Updated 27 Aug 2024

Q1. how to find duplicate entries in a table using SQL

Ans.

Use SQL query with GROUP BY and HAVING clause to find duplicate entries in a table.

  • Use GROUP BY clause to group the rows based on the columns that you suspect may have duplicates.

  • Use COUNT() function to count the number of occurrences of each group.

  • Use HAVING clause to filter out groups that have more than one occurrence, indicating duplicates.

  • Example: SELECT column1, column2, COUNT(*) FROM table_name GROUP BY column1, column2 HAVING COUNT(*) > 1;

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