Delete multiple records in the table...
HelloI have a table with 720 000 records, I want to delete records for the date of joining i, e for 20/10/2008. To this date there 1065 records. can I use a simple delete for this statement?
Delete from Test where Join_date = 20 October 2008 ';
Is this is a good way to do it? Any suggestion splease.
Thank you!!
Hello
user642297 wrote:
HelloI have a table with 720 000 records, I want to delete records for the date of joining i, e for 20/10/2008. To this date there 1065 records. can I use a simple delete for this statement?
Delete from Test where Join_date = 20 October 2008 ';
Is this is a good way to do it? Any suggestion splease.
Thank you!!
Yes, you can use statements like this to delete several lines at once.
Remember that all DATEs include a time. The statement you posted only deletes the lines dated at midnight (that is, 20 October 2008 00:00:00).
To remove all the same day, regardless of the time, say
WHERE Join_date >= TO_DATE ('20-oct-2008', 'dd-mon-yyyy')
AND Join_date < TO_DATE ('21-oct-2008', 'dd-mon-yyyy')
If encoding time is more valuable than the run time, one could also say:
WHERE TRUNC (Join_date) = TO_DATE ('20-oct-2008', 'dd-mon-yyyy')
Tags: Database
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