Table Multiple Sql Query Union - sql

Question

I have following table which is having duplicate record with respect to different fields:
CREATE TABLE Student1
(`id` int,`status` int,`amount` int , `Name` varchar(10), `date` varchar(55))
;
INSERT INTO Student1
(`id`,`status`,`amount`, `Name`, `date`)
VALUES
(1,0,4500, 'ram', '04/02/2012'),
(2,0,2000, 'shyam', '05/09/2013'),
(4,0,1500, 'ghanshyam', '08/11/2014'),
(3,0,4500, 'gopal', '04/02/2012'),
(2,0,8000, 'radheshyam', '15/11/2013'),
(4,1,1500, 'ghanshyam', '18/10/2015'),
(1,1,4500, 'ram', '14/02/2012'),
(2,0,6500, 'radhe', '11/11/2014'),
(3,1,4500, 'gopal', '14/02/2015'),
(5,1,4500, 'gopala', '04/02/2015'),
(5,1,4500, 'gopala', '04/02/2015'),
(6,0,14500, 'gopal', '14/02/2015')
;
I have 3 conditions to filter the table:
No complete duplicate record
If record with same id but different Name and date field then add all of them to final result
If status=1 for any record then select that record of respective id
Add all record with id different from id of above 3 conditions
I have written this query:
SELECT * FROM Student1
GROUP BY id,status,amount,Name,date
HAVING COUNT(*) > 1
UNION
SELECT * FROM Student1 Student1
WHERE id IN
(
SELECT id FROM Student1
GROUP BY id
HAVING COUNT(DISTINCT name) > 1
AND COUNT(DISTINCT date) > 1
)
UNION
SELECT * FROM Student1 Student1
WHERE status=1 AND id IN
(
SELECT id FROM Student1
GROUP BY id
HAVING COUNT(id) >= 2
);
Result:
id status amount Name date
4 1 1500 ghanshyam 18/10/2015
1 1 4500 ram 14/02/2012
3 1 4500 gopal 14/02/2015
5 1 4500 gopala 04/02/2015
2 0 2000 shyam 05/09/2013
2 0 8000 radheshyam 15/11/2013
2 0 6500 radhe 11/11/2014
As you can see 1st Select avoid duplicate, 2nd Select record with same id having different Name, date, 3rd Select to get record with id=1. I am using UNION to avoid duplication in result.
Now I need to add 4th query to get the record id=6 which is not present in all the above condition.
Expected Result:
id status amount Name date
4 1 1500 ghanshyam 18/10/2015
1 1 4500 ram 14/02/2012
3 1 4500 gopal 14/02/2015
5 1 4500 gopala 04/02/2015
2 0 2000 shyam 05/09/2013
2 0 8000 radheshyam 15/11/2013
2 0 6500 radhe 11/11/2014
6 0 14500 gopal 14/02/2015
I need to solve the 4th query. Please help.

Answer 1

If the only condition you want to filter, is id = 6, it is enough to add just:
SELECT * FROM Student1 WHERE id=6;
Which is direct translation of your request into SQL. And full version will be:
SELECT * FROM Student1
GROUP BY id,status,amount,Name,date
HAVING COUNT(*) > 1
UNION
SELECT * FROM Student1 Student1
WHERE id IN
(
SELECT id FROM Student1
GROUP BY id
HAVING COUNT(DISTINCT name) > 1
AND COUNT(DISTINCT date) > 1
)
UNION
SELECT * FROM Student1 Student1
WHERE status=1 AND id IN
(
SELECT id FROM Student1
GROUP BY id
HAVING COUNT(id) >= 2
)
UNION
SELECT * FROM Student1 WHERE id=6;
Result is as requested but in different order. DEMO
However, if you would like to get all id which were not filtered with your coditions, but you don't know their values, I would use a VIEW:
CREATE VIEW Student2 AS
SELECT * FROM Student1
GROUP BY id,status,amount,Name,date
HAVING COUNT(*) > 1
UNION
SELECT * FROM Student1 Student1
WHERE id IN
(
SELECT id FROM Student1
GROUP BY id
HAVING COUNT(DISTINCT name) > 1
AND COUNT(DISTINCT date) > 1
)
UNION
SELECT * FROM Student1 Student1
WHERE status=1 AND id IN
(
SELECT id FROM Student1
GROUP BY id
HAVING COUNT(id) >= 2
);
And then query with it:
SELECT * FROM Student2
UNION
SELECT * FROM Student1 WHERE id NOT IN (SELECT id FROM Student2);
The result is the same. DEMO