How to identify duplicate records in SQL?

To identify rows with duplicate records, you can use the GROUP BY and HAVING clauses in SQL. Here is an example query:

SELECT column1, column2, ..., columnN, COUNT(*) as count
FROM table
GROUP BY column1, column2, ..., columnN
HAVING COUNT(*) > 1;

In the above query, column1, column2, …, columnN are the names of the columns to query, and table is the name of the table to query. The COUNT(*) function is used to calculate the number of duplicates in each row, and the HAVING clause is used to filter out rows with duplicate counts greater than 1.

In this way, the query results will return all rows of duplicate records, including the duplicate column values and the number of duplicates.