fresher Engineer
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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