How to Retrieve Unique First Names with Corresponding IDs and Last Names in MySQL?

Retrieve Distinct Column with Corresponding Information in MySQL

Identifying the need to extract unique values from a specific column while preserving corresponding data, this question delves into the intricacies of MySQL's DISTINCT functionality.

The Query:

To achieve the desired outcome, the SELECT query should incorporate a combination of the DISTINCT operator and the GROUP BY clause. The DISTINCT operator isolates unique values within a specified column. In this case, we seek distinct values from the FirstName column.

Implementation:

To preserve the ID and LastName columns along with the distinct FirstName values, the GROUP BY clause plays a pivotal role. GROUP BY instructs MySQL to group rows based on the specified column(s) and return a single aggregate row for each unique value. In this case, we group by the FirstName column.

The Result:

The resulting query is as follows:

SELECT ID, FirstName, LastName
FROM table
GROUP BY(FirstName)

This query successfully retrieves distinct FirstName values while retaining the corresponding ID and LastName for each unique FirstName. For instance, only one John will be displayed, accompanied by the ID 1 and LastName Doe. Hence, the query effectively meets the user's criteria.

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