decrease/increase between date in mysql or oracle SQL - mysql

Question

I've problem in query mysql
I want to find hour per date between 2 date divided by day
for example,
I have startdate 14/12/2014 09:00:00AM , and enddate 17/12/2014 03:30:00AM
I want to result like this
14/12/2014 - 15 hour
15/12/1014 - 24 hour
16/12/2014 - 24 hour
17/12/2014 - 3,5 hour
Is that possible in a MySQL or Oracle SQL query?

Answer 1

Finally, I have found the query for oracle sql...
THANKS FOR YOUR HELP
SELECT
TO_DATE (START_DATE + COLUMN_VALUE - 1, 'DD/MM/YYYY') AS THE_DATE,
CASE
WHEN TO_DATE (START_DATE, 'DD/MM/YYYY') = TO_DATE (END_DATE, 'DD/MM/YYYY')
THEN (END_DATE - START_DATE)*24
WHEN (START_DATE + COLUMN_VALUE - 1) = START_DATE
THEN (23 - TO_CHAR (START_DATE, 'HH24')) + ((60 - TO_CHAR (START_DATE, 'MI'))/60) + ((360 - TO_CHAR (START_DATE, 'SS'))/360)
WHEN TO_DATE (START_DATE + COLUMN_VALUE - 1, 'DD/MM/YYYY') <> TO_DATE (END_DATE, 'DD/MM/YYYY')
THEN 24
ELSE TO_CHAR (END_DATE, 'HH24') +
(TO_CHAR (END_DATE, 'MI')/60) +
(TO_CHAR (END_DATE, 'SS')/360) END
FROM MY_TABLE,
TABLE( CAST( MULTISET (
SELECT
LEVEL L
FROM DUAL
CONNECT BY LEVEL <= END_DATE - START_DATE + 1) AS SYS.ODCINUMBERLIST))

Answer 2

Use MySQL TIMESTAMPDIFF or Oracle EXTRACT function to calculate difference between two value fields of Datetime type (2nd and 3rd parameters). 1st parameter passed is your selected measurement to count the difference. This could be HOUR, MINUTE, SECOND, DAY etc.
SELECT
`startdate` AS `date`,
TIMESTAMPDIFF(
HOUR,
`startdate`,
`enddate`) AS `hours_delta`
FROM my_table
The result would be:
___date_______hours_delta____
14/12/2014________66________
15/12/1014________..._________

Answer 3

SQL Fiddle
Oracle 11g R2 Schema Setup:
CREATE TABLE MY_TABLE ( ID, START_DATE, END_DATE ) AS
SELECT 1, TO_DATE( '14/12/2014 09:00:00AM', 'DD/MM/YYYY HH:MI:SSAM'), TO_DATE( '17/12/2014 03:30:00AM', 'DD/MM/YYYY HH:MI:SSAM') FROM DUAL
UNION ALL SELECT 2, TO_DATE( '20/12/2014 09:00:00AM', 'DD/MM/YYYY HH:MI:SSAM'), TO_DATE( '20/12/2014 03:30:00PM', 'DD/MM/YYYY HH:MI:SSAM') FROM DUAL
Query 1:
WITH Differences AS (
SELECT ID,
TRUNC( START_DATE ) AS Day,
LEAST(
TRUNC( START_DATE ) + INTERVAL '1' DAY,
END_DATE
) - START_DATE AS Diff
FROM MY_TABLE
UNION
SELECT ID,
COLUMN_VALUE,
CASE WHEN COLUMN_VALUE < TRUNC( END_DATE )
THEN 1
ELSE END_DATE - COLUMN_VALUE
END
FROM MY_TABLE,
TABLE( CAST( MULTISET (
SELECT TRUNC( START_DATE ) + LEVEL
FROM DUAL
WHERE TRUNC( START_DATE ) + LEVEL <= TRUNC( END_DATE )
CONNECT BY
TRUNC( START_DATE ) + LEVEL <= TRUNC( END_DATE )
) AS SYS.ODCIDATELIST ) )
)
SELECT ID,
TO_CHAR( Day, 'YYYY-MM-DD' ) AS Day,
TO_CHAR( TO_NUMBER( Diff * 24 ), '99D90' )
|| ' hour ' AS Hours
FROM DIFFERENCES
Results:
| ID | DAY | HOURS |
|----|------------|--------------|
| 1 | 2014-12-14 | 15.00 hour |
| 1 | 2014-12-15 | 24.00 hour |
| 1 | 2014-12-16 | 24.00 hour |
| 1 | 2014-12-17 | 3.50 hour |
| 2 | 2014-12-20 | 6.50 hour |