so i suppose an automatic delete of every duplicate record is out of the question :-)
Paul DuBois wrote: > At 18:00 -0400 5/10/02, Augey Mikus wrote: > >> is there a way for me to do it in a mysql delete statement? just out >> of curiosity, for instance, if i wanted to add duplicates later for >> whatever reason. > > > Okay, let's suppose you have 3947 instances of "abc". > You can use LIMIT for this: > > DELETE FROM tbl_name WHERE col_name = "abc" LIMIT 3946; > > >> >> Paul DuBois wrote: >> >>> At 17:54 -0400 5/10/02, Augey Mikus wrote: >>> >>>> what i meant is deleting duplicate occurences of records of a >>>> certain field. ...sorry... >>> >>> >>> >>> Ah. >>> >>> One thing you can do is add a unique index on that field with >>> ALTER IGNORE TABLE tbl_name ADD UNIQUE (col_name) >>> or >>> ALTER IGNORE TABLE tbl_name ADD PRIMARY KEY (col_name) >>> >>> and MySQL will clobber duplicate records as it builds the index. >>> >>>> >>>> >>>> Paul DuBois wrote: >>>> >>>>> At 17:16 -0400 5/10/02, Augey Mikus wrote: >>>>> >>>>>> what is the simplest way to delete duplicate occurences of a >>>>>> specific field in mysql? >>>>>> >>>>>> thanks, >>>>>> >>>>>> augey >>>>> >>>>> >>>>> >>>>> >>>>> Your question is a bit ambiguous. You could do this by using ALTER >>>>> TABLE to remove the column itself from the table, for example, but >>>>> I'm guessing maybe that's not what you mean. >>>> > > --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
