finding duplicate fields
2 Message(s) by 2 Author(s) originally posted in mysql database
| From: Ike |
Date: Friday, June 09, 2006
|
This may be a particularly dumb question, but I'm wrestling with it anyways.
Is there a way, to discern a duplicate
field among records in a
table . For
example, suppose I've a table such that:
CREATE TABLE `sometable` (
`id` int(11) NOT NULL auto_increment,
`sometext` varchar(80) NOT NULL default '',
PRIMARY KEY (`id`)
)
I want to find all records where `sometext` = `sometext` in another
record. That is, I want to find those records where there is more than one
instance of `sometext` without regard to what `sometext` is. I may have a
row where `sometext` = "abc" and another where it is `zyx` and I don't
want to put a value for `sometext` into the WHERE portion of my sql select
statement. How can I find duplicated fields where I dont know what the value
of the field being duplicated is a priori? Thanks, Ike
| From: VeloMaster |
Date: Saturday, May 19, 2007
|
wrote in message:
Try this:
SELECT f.*, s.* FROM firsttable f, secondtable s WHERE f.somecolumn =
s.somecolumn
This may be a particularly dumb question, but I'm wrestling with it anyways.
Is there a way, to discern a duplicate field among records in a table. For
example, suppose I have a table such that:
CREATE TABLE `sometable` (
`id` int(11) NOT NULL auto_increment,
`sometext` varchar(80) NOT NULL default '',
PRIMARY KEY (`id`)
)
I want to find all records where `sometext` = `sometext` in another
record. That is, I want to find those records where there is more than one
instance of `sometext` without regard to what `sometext` is. I may have a
row where `sometext` = "abc" and another where it is `zyx` and I don't
want to put a value for `sometext` into the WHERE portion of my sql select
statement. How can I find duplicated fields where I dont know what the value
of the field being duplicated is a priori? Thanks, Ike
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