Web Reference: Feb 3, 2026 · Duplicate records can be found in SQL by using the GROUP BY and HAVING clauses along with the COUNT () function. These tools help group similar values and check how many times they appear in a table. Jul 28, 2019 · You can use count(*) over (partition by ...) to select all rows that are duplicate of each other. This approach gives you access to all rows and all columns (unlike group by which consolidates duplicates rows and makes ungrouped columns inaccessible). First, create a new table named t1 that contains three columns id, a, and b. Then, insert some rows into the t1table: The t1table contains the following duplicate rows: Your goal is to write a query to find the above duplicate rows.
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