Sql select only first row of duplicates

1. How to get first record of duplicates in SQL?
2. How to get only one record for each duplicate rows of the id in SQL?
3. How to select only one row from duplicate rows in Oracle?

How to get first record of duplicates in SQL?

To select duplicate values, you need to create groups of rows with the same values and then select the groups with counts greater than one. You can achieve that by using GROUP BY and a HAVING clause.

How to get only one record for each duplicate rows of the id in SQL?

Using the GROUP BY clause to group all rows by the target column(s) – i.e. the column(s) you want to check for duplicate values on. Using the COUNT function in the HAVING clause to check if any of the groups have more than 1 entry; those would be the duplicate values.

How to select only one row from duplicate rows in Oracle?

A few different ways: SELECT DISTINCT <dup rows> … ; - this will fetch a single row for each set of values. SELECT … GROUP BY <all the columns selected>; - effectively same as SELECT DISTINCT.