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Can we use distinct with ORDER BY clause?
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 I use ORDER BY and distinct together in SQL?
If we add the DISTINCT operation, it would be added between SELECT and ORDER BY :
- FROM MonitoringJob.
- SELECT Category, CreationDate.
- DISTINCT.
- ORDER BY CreationDate DESC.
- SELECT Category.
Does distinct preserve order?
Yes, Enumerable. Distinct preserves order. Assuming the method to be lazy “yields distinct values are soon as they are seen”, it follows automatically.
How do you SELECT distinct rows in SQL based on multiple columns?
Select with distinct on all columns of the first query. Select with distinct on multiple columns and order by clause. Count() function and select with distinct on multiple columns.
When to select distinct and order by in Excel?
ORDER BY items must appear in the select list if SELECT DISTINCT is specified. This message pops up when you ask for DISTINCT rows for one set of columns, but you’d like to have the results ordered by one or more columns not specified in your distinct set.
How to select distinct on order in PostgreSQL?
PostgreSQL DISTINCT ON with different ORDER BY SELECT * FROM ( SELECT DISTINCT ON (col1) col1, col2, col3 FROM test ORDER BY col1, col3 DESC ) sub ORDER BY col3 DESC, col2; Assuming that col2functionally depends on col1, so we can ignore it in DISTINCT ONand ORDER BYof the inner query.
Do you have to select distinct in SQL Server?
ORDER BY items must appear in the select list if SELECT DISTINCT is specified. This message pops up when you ask for DISTINCT rows for one set of columns, but you’d like to have the results ordered by one or more columns not specified in your distinct set. For some reason, SQL Server will not allow this!
How to use order by in same SELECT statement?
Extended sort key columns. 1 FROM MonitoringJob. 2 SELECT Category, CreationDate i.e. add a so called extended sort key column. 3 ORDER BY CreationDate DESC. 4 SELECT Category i.e. remove the extended sort key column again from the result.