animesh sharma :
How should I write a SQL queries to find all unique value of a column that are present in all date range.
+-------------+--------+------------+
| primary_key | column | date |
+-------------+--------+------------+
| 1 | a | 2020-03-01 |
| 2 | a | 2020-03-02 |
| 3 | a | 2020-03-03 |
| 4 | a | 2020-03-04 |
| 5 | b | 2020-03-01 |
| 6 | b | 2020-03-02 |
| 7 | b | 2020-03-03 |
| 8 | b | 2020-03-04 |
| 9 | c | 2020-03-01 |
| 10 | c | 2020-03-02 |
| 11 | c | 2020-03-03 |
| 12 | d | 2020-03-04 |
+-------------+--------+------------+
In the above example if query date range is 2020-03-01 to 2020-03-04 output should be
a
b
since only a and b are present for that range similarly if query date range is 2020-03-01 to 2020-03-03 output should be
a
b
c
I could do this in an python script by fetching all rows and using a set. Is is possible to write a SQL query yo achieve same result?
Tim Biegeleisen :
You may aggregate by column value and then assert the distinct date count:
SELECT col
FROM yourTable
WHERE date BETWEEN '2020-03-01' AND '2020-03-04'
GROUP BY col
HAVING COUNT(DISTINCT date) = 4;
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