How to Find Duplicates in a Table ?
Quick Answer: Use the GROUP BY and HAVING clauses to identify rows that appear more than once.
Example: Imagine you have an employees table with columns first_name, last_name, and email. To find duplicate entries based on first_name and last_name
SELECT first_name, last_name, COUNT(*)
FROM employees
GROUP BY first_name, last_name
HAVING COUNT(*) > 1;
This query groups the rows by first_name and last_name, then filters to show only those groups with more than one occurrence, identifying the duplicates.
Quick Answer: Use the GROUP BY and HAVING clauses to identify rows that appear more than once.
Example: Imagine you have an employees table with columns first_name, last_name, and email. To find duplicate entries based on first_name and last_name
SELECT first_name, last_name, COUNT(*)
FROM employees
GROUP BY first_name, last_name
HAVING COUNT(*) > 1;
This query groups the rows by first_name and last_name, then filters to show only those groups with more than one occurrence, identifying the duplicates.
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And follow me on LinkedIn
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