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SQL Puzzle | 5 Ways to GET DISTINCT DATA without using distinct Keyword | SQL Interview Question
In this post we will understand what are the multiple ways to find distinct rows without using distinct Keyword.
As far as I know methods we can use here are-
- 1. Using UNION
- 2. Using RowNumber
- 3. Using GroupBy
- 4. Using EXCEPT
- 5. Using INTERSECT
Sample script to create table and different methods are given below.
-- --Multiple Ways to Find Distinct Values CREATE TABLE Duplicate ( ID INT ) GO INSERT INTO Duplicate(ID) VALUES (1),(1),(2),(2),(2),(1),(1),(1) GO SELECT * FROM Duplicate GO -- |
Current Data
-- ID ----------- 1 1 2 2 2 1 1 1 (8 rows affected) -- |
Sample Testing
–Method 1 – Using UNION
-- SELECT ID from Duplicate UNION SELECT TOP 1 ID FROM Duplicate -- |
OUTPUT
-- ID ----------- 1 2 (2 rows affected) -- |
–Method 2 – Using Row Number
-- SELECT ID FROM ( SELECT ID , ROW_NUMBER() OVER (PARTITION BY ID ORDER BY ID) rnk FROM Duplicate )a WHERE rnk = 1 -- |
OUTPUT
-- ID ----------- 1 2 (2 rows affected) -- |
–Method 3 – Using Group By
-- SELECT ID FROM Duplicate GROUP By ID -- |
OUTPUT
-- ID ----------- 1 2 (2 rows affected) -- |
–Method 4 – Using EXCEPT
-- SELECT ID from Duplicate EXCEPT SELECT NULL /* Provide any value which you do not expect in the table*/ -- |
OUTPUT
-- ID ----------- 1 2 (2 rows affected) -- |
–Method 5 – Using INTERSECT
-- SELECT ID from Duplicate INTERSECT SELECT ID FROM Duplicate -- |
OUTPUT
-- ID ----------- 1 2 (2 rows affected) -- |
Please add a comment if you have any other or better solution in mind. I would love to learn it. We all need to learn. Thanks in advance.
Pawan Khowal
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Hi There,
Allow me to show my gratitude bloggers. You guys are like unicorns. Never seen but always spreading magic. Your content is yummy. So, satisfied.
Obviously by the title, I do not know how to ask this question. I have a table that has a non-unique key. I want to create a query that only returns one row per key, based on Max(db2timestamp).
CYCLE specifies that the sequence continues to generate values after reaching either maximum or minimum value. After pan-ascending sequence reaches its maximum value, it generates its minimum value. After a descending sequence reaches its minimum, it generates its maximum.
Looking for ideas on how to do it efficiently. This will be used on several large tables as part of an ETL process each night. There might be several combined columns that make up the key and the row might have several hundred columns. But trying to get ideas on how to get the unique key with associated row values efficiently? Maybe add a IDENTITY column? Thinking not a WINDOWS FUnction. They are not very efficient for large tables.
An example of what I am looking for
Expected results
‘11111’, ‘SMITH’
‘22222’, ‘BROWN’
‘33333’, ‘JONES’ — or OWENS, do not care
‘44444’, ‘HILLS’ — or OWENS, do not care
drop table #custdata
create table #custdata (custkey varchar(28), custname varchar(28))
insert into #custdata (custkey, custname)
values
(‘11111’, ‘SMITH’),
(‘11111’, ‘SMITH’),
(‘11111’, ‘SMITH’),
(‘22222’, ‘BROWN’),
(‘33333’, ‘JONES’),
(‘33333’, ‘OWENS’),
(‘44444’, ‘HILLS’),
(‘44444’, ‘HILLS’),
(‘44444’, ‘OWENS’)
It was cool to see your article pop up in my google search for the process yesterday. Great Guide.
Keep up the good work!
Thanks,
Adam
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