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On 09/05/2011 01:37 PM, Pau Marc Muñoz Torres wrote:
<blockquote
cite="mid:CADFuJLi3K0X1A7OwR+9_neWjKCEXtYYyMP_n=x5z=D2+GNCTNw@mail.gmail.com"
type="cite">i don't see it clear, let me put an example
i got the following table
molec varchar(30)
seq varchar(100)
where I insert my values
lets image that i have a record introduced as ('ubq',
'aadgylpittrs')
how i can prevent to insert another record where molec='ubq' ?
thanks
Either put a unique constraint on molec or do
insert into tbl(molec,seq)
select 'ubq', 'aadgylpittrs' where not exists(select molec from tbl
where molec='ubq')
