I suppose the i could always remove the unique constraint once the alter statement has removed the duplicates.
ok Paul DuBois wrote: > At 18:13 -0400 5/10/02, Augey Mikus wrote: > >> so i suppose an automatic delete of every duplicate record is out of >> the question :-) > > > Sounds like you're trying to have it both ways. > >> >> 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
