Can I use GROUP BY without aggregate function?

Can I use GROUP BY without aggregate function?

You can use the GROUP BY clause without applying an aggregate function. In this case, the GROUP BY works like the DISTINCT clause that removes duplicate rows from the result set.

Can we use GROUP BY without aggregate function SQL Server?

You can perform a DISTINCT select by using a GROUP BY without any AGGREGATES.

Is GROUP BY faster than distinct?

DISTINCT is used to filter unique records out of all records in the table. It removes the duplicate rows. SELECT DISTINCT will always be the same, or faster than a GROUP BY.

How do I count without GROUP BY in SQL?

4 Answers

1. select a, count(*) as c from mytable group by a where c > 1; You need to replace where with having in this case, as follows:
2. select a, count(*) as c from mytable group by a having c > 1; NB The following query form will also work:
3. select * from ( select a, count(*) as c from mytable group by a ) where c > 1;

What are non aggregate functions in SQL?

There are two types of SQL functions, aggregate functions, and scalar(non-aggregate) functions. Aggregate functions operate on many records and produce a summary, works with GROUP BY whereas non-aggregate functions operate on each record independently.

What to do if there is no aggregate function in group by?

If there’s no aggregate function and if you don’t mind getting the result in ascending or descending order, you can use sorting instead (ORDER BY). Functionally, if you use GROUP BY with no Aggregate functions in the select, you are just doing a DISTINCT.

Why is groupby not supported in Stack Overflow?

Your .GroupBy (y => y.LanguageCode).ToDictionaryAsync (y => y.Key, y => y.Select (z => z.Name)); cannot be converted to SQL. EF Core 3.0 will throw exception to make sure you know that all records in Units will be fetched from database before grouping and map to Dictionary.

Why is column not a group by expression in SQL Server?

SQL Server. Column ‘customers.city’ is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause. So, what’s wrong with our query?

Which is an example of not a group by expression?

The Oracle message “Not a GROUP BY expression” is one such example. Let’s review what this is about and how to fix it. We are going to assume some basic understanding of how GROUP BY works. If you are not familiar with grouping data in SQL, check out this introductory article on using GROUP BY in SQL.