sql - Issue with check constraint -

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i want create check constraint allow session of date end session greater date begin session :

alter table sessionn add constraint checkdate_ck check ( sessionn.datebeginsessionstage <sessionn.dateendsessionstage)

but have probleme message :

msg 547, level 16, state 0, line 1 alter table statement conflicted check constraint "checkdate_ck". conflict occurred in database "v12013", table "dbo.sessionn".


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