SELECT DISTINCT with COUNT() and GROUP BY Clause
In the above example, we will count distinct values considering two of the columns of the table. We will use GROUP BY clause and COUNT() function.
Query:
SELECT course,count(DISTINCT CONCAT(score, course)) as count_score_course
from w3wiki
GROUP by course ;
Output:
Explanation: In the above image, we can see that two columns are displayed in the resultant image. One column is of course column and other is its corresponding unique value count. We can see that all the records have only one unique combination. We can confirm it by referring to the main table.
How to SELECT DISTINCT on Multiple Columns in SQL?
In the world of databases, data duplication can lead to confusion and inefficiency. SQL provides a powerful tool, SELECT DISTINCT, to retrieve unique values from columns. However, when dealing with multiple columns, the approach becomes more detailed.
In this article, We will explore How to SELECT DISTINCT on multiple columns in SQL by understanding various methods along with the practical implementation and so on.
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