Howto: comparing 2 dates and getting the seconds

By comparing 2 dates I need to extract or get somehow the elapsed seconds. I need to get only
the seconds.
Dates are in this format "hh:mm:ss"
I tried with Date and GregorianCalendar but I couldnt get the desired result.
Can someone provide me with a sample code please.

remus.dragos wrote:
Its not broken, nor absurd or complicated. I only need resolution only for minutes. The method that I use does not need to know more than 20 seconds.
But I added minutes knoledge aniway. As you can see its easy to add hour resolution if needed. But I didnt needed it so thats why I took that approach.
This looks cleaner for you? I just wrote it here, untested, but should work.
public int returnSeconds(Calendar c1, Calendar c2)
int mins = c1.get(Calendar.MINUTES) - c2.get(Calendar.MINUTES);
int secs = c1.get(Calendar.SECONDS) - c2.get(Calendar.SECONDS);
if (mins > 0) return secs+=mins;
else return secs;
}And why should I treat all the time as miliseconds since the epoch. Thats an absurd afirmation without a detailed explanation.
Edited by: remus.dragos on Apr 30, 2008 6:18 AM- Unnecessary creation of expensive Calendar objects.
- Significantly slower
- Breaks across Timezones
- Unnecessary decision making introduces complexity
- Introduces a bug by assuming c1 represents a time greater than c2
- Introduces a bug by not multiplying minutes by 60 to obtain seconds.
- Makes assumptions about the calendar system in use
- Less maintainable because it limits the scope of time unit resolution handled by the logic
I probably missed some more too. None of this is needed, and it is very brittle. Your problem can be solved by subtracting one fixed-point number from another. Go with es5f's approach.

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Compare 2 schemas and get the difference with .sql file.

Hi,
I am using ORACLE DATABASE 11g R2 and ORACLE Linux 5.
I want to perform a very lengthy process and want to make it automated.
I am having a software named as SVN. In which all the developers keep their updated scripts.
We have 2 schema's one is used for developement and when all the development seems good we implement the scripts on the final schema which is used by testing people also.
Now every day we need to check the modifications in the development schema, that we do by observing the updated scripts in the SVN software. Now we get the scripts which are modified.
We will fire this scripts to a sample schema then we will compare the objects in this schema and the same objects in our final schema. If the objects in sample schema is different than the final schema it should give me the
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Below is a proper example to explain :-
Developement Schema :- 'DEV'
SVN Script Schema :- 'SVNscript'
Main Schema :- 'MAIN'
1) On Monday developers modified/added 4 tables in the development schema names 'DEV' after working for a day they found that the changes are necessary and so checked-in in the SVN software.
2) On tuesday morning we found 4 scripts which has been modified/added in the SVN.
The Scripts were as follows :-
1St table :- An extra column was added.
2nd table :- An index was created on it.
3rd table :- 2 Columns were dropped from it.
4th table :- A new table is added in the schema.
Now taking these 4 scripts i am going to execute it in a sample schema named :- SVNscript
SVNscript schema will have now 4 tables with proper properties(columns,indexes,...). Now this is the final table structure as we want in our 'MAIN' schema .
Coming to MAIN schema which is our most important schema and all the development work is finally posted here.Considering MAIN schema is having around 1000 tables,500 function/procedure/package and many more DB objects.
I want to compare(one way compare) from SVNscript schema --> MAIN schema :- That the objects present in the SVNscripts schema is same or not in the MAIN schema. If its not same then this code should generate a .sql script for me which i should be able to fire on the MAIN schema.
The output .sql scripts should be something like this :-
1st Table :- Alter table add...
2nd Table :- Create index on table...
3rd Table :- Alter table drop...
4th table :- Create table tablename...
I found a link while trying this but it is not the perfect fit to my requirement
http://www.dbspecialists.com/files/scripts/compare_schemas.sql
Please let me know the best code to compare 2 schemas and get a .sql file as output of the difference.
Thanks in advance.

Yes I followed the tutorial properly this time. Still i have a few queries :-
1) This is returning me the 'ALTER TABLE...' statement but how to make it more efficient to return all the DDL dependent on the table, Like index,trigger,view...
2) I want to compare objects in a different schema on a different db. I have created an DBLINK but how to use it ... can i use it like
DBMS_METADATA.OPEN('TABLE'," Network_link_name " );Can you please give me some clear about it.
3) I created a table 'TAB1' with which i want to compare a 'TAB1' in other schema.I was not getting how to compare on remote dblink so,I created the same table with the following code in the same schema
CREATE TABLE TAB1_OLD as select * from TAB1@DBLINK where 1=2;Now when i fire the below query to get the alter difference I get the following error :-
SQL> SELECT get_table_alterddl('TAB1','TAB1_old') FROM dual;
SELECT get_table_alterddl('TAB1','TAB1_old') FROM dual
ORA-31603: object "TAB1_old" of type TABLE not found in schema "SVNCHECK"
ORA-06512: at "SYS.DBMS_METADATA", line 5225
ORA-06512: at "SYS.DBMS_METADATA", line 5189
ORA-06512: at "SVNCHECK.GET_TABLE_SXML", line 17
ORA-06512: at "SVNCHECK.COMPARE_TABLE_SXML", line 12
ORA-06512: at "SVNCHECK.GET_TABLE_ALTERXML", line 11
ORA-06512: at "SVNCHECK.GET_TABLE_ALTERDDL", line 11
Can you please guide me why i am getting this error?
I have made sure that TAB1_OLD table has been created and the entries are also present in the data dictionary tables.
SQL> select * from tab1_old;
EMPNO ENAME MGR DEPTNO
----- -------------------- ----- ------The only difference is that this table was created with CREATE TABLE AS SELECT statement ....
Thanks.

Function to compare tow dates and set the value

Hi All,
I have two dates with close date and Due date.And i want to set the value as 1 if close date is less then or equal to to due date else 0 .And my other condition is to set 1 when close date is greater the due date.Can any one help me how can I
achieve it.
Thanks, Sid

Hello Sid,
For this you can use a simple IF Statement with a compare on the Dates:
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I should only get the record which contain lastest date. (eg: I should picked up Record3)
Table i_test
Field 1              Field 2(date)
Record1            20090322
Record2            20090101
Record3            20090601
Moderator message - Please search before asking and do not ask basic questions - post locked
Edited by: Rob Burbank on Jun 17, 2009 9:21 AM

Its easy...sort the internal table using the field i.e. date field in DESCENDING manner
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READ gt_final INDEX 1.

Substacting two dates and get result in months

Hi Friends
I have to subtract two dates and get the difference in months. Here's the sample data:
select DATE '2009-10-01' Date_value, 111 Cust_id, DATE '2009-10-22' Open_date from dual
union all
select DATE '2009-10-01', 112 , DATE '2009-10-15' from dual
union all
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union all
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union all
select DATE '2009-11-01', 112 ,DATE '2009-10-15' from dual
union all
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SELECT cust_id, date_value, open_date,
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FROM tBut the output is unexpected:
CUST_ID     DATE_VALUE     OPEN_DATE     DIFF_IN_MONTHS
111     1/10/2009     22/10/2009     1
112     1/10/2009     15/10/2009     0
113     1/10/2009     5/10/2009     0
111     1/11/2009     22/10/2009     0
112     1/11/2009     15/10/2009     1
113     1/11/2009     22/10/2009     0Ideally, the output should be as per the following:
CUST_ID     DATE_VALUE     OPEN_DATE     DIFF_IN_MONTHS
111     1/10/2009     22/10/2009     0
112     1/10/2009     15/10/2009     0
113     1/10/2009     5/10/2009     0
111     1/11/2009     22/10/2009     1
112     1/11/2009     15/10/2009     1
113     1/11/2009     22/10/2009     1What is wrong in my query?

Hi Centinul
Found the resolution. When I use the following query, I get the perfect result:
SELECT cust_id, date_value, open_date,
       ROUND (ABS (MONTHS_BETWEEN (open_date, date_value))) months,
       ROUND (ABS (date_value - open_date) / 365 * 12) diff_in_months,
       MONTHS_BETWEEN (date_value,ADD_MONTHS (LAST_DAY (open_date), -1) + 1 ) final_val
FROM tAnd here's the output of all three columns:
CUST_ID     DATE_VALUE     OPEN_DATE     MONTHS     DIFF_IN_MONTHS     FINAL_VAL
111     1/10/2009     22/10/2009     1     1     0
112     1/10/2009     15/10/2009     0     0     0
113     1/10/2009     5/10/2009     0     0     0
111     1/11/2009     22/10/2009     0     0     1
112     1/11/2009     15/10/2009     1     1     1
113     1/11/2009     22/10/2009     0     0     1

Date fields and compare and get the later date of the fields

I am trying to compare these date fields and compare and get the later date of the fields
Tables are
TABCASER
TABCASER1
EVCASERS
Field
Are
TABCASER1.CASER_no
The dates are to be compared and then get the records with the highest or latest date value.
TABCASER1.CASERRECIEVEDDATE
EVCASERS.FINALEVDATES
EVCASERS.PUBLICATIONDATE
EVCASERS.PUBLICATIONDATE
TABCASER.COMPAREACCEPDATE
I have this code but I am trying to figure out what it all means.
I have several questions.
1.
1.     greatest it is used here to compare right? How do I then output this ? do I store it to a var (coldfusion) ultimately , I wish to send it to a page of records
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3.     decode, is this necessary too. What does this do? NULL?
4.
5.
6.     when I do get the query results how do I send it to coldsuion and out put to a display.
Someone sent me this code.
is there abetter way of doing this? To compare the dates and store in a var to display. thanks
Here is my code below:
Greatest(
     CASE
          WHEN INSTR(TABCASER1.CASER_no,'-CE') > 0 THEN
     decode(TABCASER1.CASERRECIEVEDDATE,NULL,TO_DATE('01/01/1900','mm/dd/yyyy'),TABCASER1.CASERRECIEVEDDATE)
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                         WHEN INSTR(TABCASER1.CASER_no,'-MONIE') > 0 THEN
     decode(EVCASERS.PUBLICATIONDATE,NULL,TO_DATE('01/01/1900','mm/dd/yyyy'),EVCASERS.PUBLICATIONDATE)
                         WHEN INSTR(TABCASER1.CASER_no,'-NADINE') > 0 THEN
     decode(EVCASERS.PUBLICATIONDATE,NULL,TO_DATE('01/01/1900','mm/dd/yyyy'),EVCASERS.PUBLICATIONDATE)
                         ELSE
     decode(TABCASER.COMPAREACCEPDATE,NULL,TO_DATE('01/01/1900','mm/dd/yyyy'),TABCASER.COMPAREACCEPDATE)
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is there abetter way of doing this? To compare the dates and store in a var to display. thanks

Hi
If you have date datatypes than:
select
greatest(TABCASER1.CASERRECIEVEDDATE, EVCASERS.FINALEVDATES, EVCASERS.PUBLICATIONDATE, EVCASERS.PUBLICATIONDATE, TABCASER.COMPAREACCEPDATE)
from TABCASER, TABCASER1, EVCASERS
where ...-- join and other conditions
1. greatest is good enough
2. to_date creates date dataype from string with the format of format string ('mm/dd/yyyy')
3. decode(a, b, c, d) is a function: if a = b than return c else d. NULL means that there is no data in the cell of the table.
6. to format the date for display use to_char function with format modell as in the to_date function.
Ott Karesz
http://www.trendo-kft.hu

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Howto: comparing 2 dates and getting the seconds

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