Can we use distinct with ORDER BY in SQL?
Either DISTINCT doesn’t work (because the added extended sort key column changes its semantics), or ORDER BY doesn’t work (because after DISTINCT we can no longer access the extended sort key column).
How do you use distinct by ORDER BY?
1 Answer
- SELECT DISTINCT Category, MAX(CreationDate)
- FROM MonitoringJob.
- GROUP BY Category.
- ORDER BY MAX(CreationDate) DESC, Category.
How do I use distinct by Group by clause in SQL?
When and where to use GROUP BY and DISTINCT. DISTINCT is used to filter unique records out of the records that satisfy the query criteria. The “GROUP BY” clause is used when you need to group the data and it should be used to apply aggregate operators to each group.
Does select distinct keep order?
If you use a DISTINCT , it is logically processed after the SELECT , but the ORDER BY still comes afterwards.
Can we use distinct *?
The distinct keyword is used in conjunction with select keyword. It is helpful when there is a need of avoiding duplicate values present in any specific columns/table. When we use distinct keyword only the unique values are fetched.
What is distinct on in SQL?
DISTINCT ON ( expression [.] ) keeps only the first row of each set of rows where the given expressions evaluate to equal. […] Note that the “first row” of each set is unpredictable unless ORDER BY is used to ensure that the desired row appears first.
Can we use distinct in having clause?
using Distinct with a Group BY is redudant, yes. But it doesnt solve the root problem. The root problem is that the HAVING clause counts the total number before the GROUP BY or the DISTINCT is operated on. Thus removing the DISTINCT will still cause an incorrect count.
What can I use instead of group by?
select , from , where , union , intersect , minus , distinct , count , and , or , as , between .
What is a key difference between the distinct and ORDER BY statements in SQL SELECT commands?
AND CUSTNUM>1000; What is a key difference between the DISTINCT and ORDER BY statements, in SQL SELECT commands? ORDER BY modifies the presentation of data results and DISTINCT filters data results. Which SQL statement alphabetizes customer names within the same satellite-office city?
How does SELECT distinct work?
A SELECT DISTINCT statement first builds our overall result set with all records, i.e including duplicate values based on FROM, JOIN, WHERE, HAVING, etc statements. Next, it sorts the result set based on the column_name or field with which DISTINCT has been used.
Can we write distinct in WHERE clause?
By using the WHERE clause with a DISTINCT clause in MySQL queries, we are putting a condition on the basis of which MySQL returns the unique rows of the result set.