Date is greater than current time plus 24 hours

Question

Hi,
may I know how to pull data from a table where date is greater than current time (+24 hours)... my date field is in the following format 15-MAR-2013 20:07:00
I want to do something like this
select * from table_A where date_field > (sys_date_time) +24h
as an example, when I run a query @ 4 PM on March 26, I want to pull data that has date > 4 PM March 27
Thanks

Answer 1

>
may I know how to pull data from a table where date is greater than current time (+24 hours)... my date field is in the following format 15-MAR-2013 20:07:00
>
No - a DATE column does NOT have a value in a format like that. The value is stored in an internal binary format. The format you posted might be your NLS_DATE_FORMAT or just a format you provided to display that date value.
>
I want to do something like this
select * from table_A where date_field > (sys_date_time) +24h
as an example, when I run a query @ 4 PM on March 26, I want to pull data that has date > 4 PM March 27
>
As others have said to add 24 hours to whatever value SYSDATE has at the time the query is executed just use 'SYSDATE + 1'.
But there are at least two caveats:
1. You can't really run a query '@4 PM'. You don't have ANY control over exactly WHEN the query will begin execution. The only way to control the date used is if you provide it yourself as part of the query.
2. Your 'date_field > SYSDATE + 1' query will NOT see inserted/updated data that has not been committed. So a similar query later may return a different result set even if it appears to cover the same time period. In other words you can't reliably use a DATE column like that to pull sequential sets/batchs of data unless there is no DML occuring on the data that might affect the results.