How to add again foreign key once it has been droped from table..?

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I have droped fkey constraint in a table..againg i have to add that..but getting error..pleas help me out..

alter table Tbl_stp_details add constraint FK_Tbl_STP_Details_Tbl_Area_Mst foreign key(C_Area_Code) references tbl_Area_mst(c_code)

error in down..

SQL

Msg 547, Level 16, State 0, Line 1
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_Tbl_STP_Details_Tbl_Area_Mst". The conflict occurred in database "ADCOCK", table "dbo.Tbl_Area_Mst", column 'C_Code'.

Posted 3-Aug-15 1:14am

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Abhipal Singh · Answer 1 · 2015-08-03T03:04:00

Check, if there is any data in the table Tbl_stp_details column C_Area_Code that is violating Foreign key constraint/referential integrity.

Or, in other words, is there any data in the to-be foreign key C_Area_Code of table Tbl_stp_details that is not in its primary table's tbl_Area_ms column C_Code

If yes, then you need to add that data in the tbl_Area_ms table first and then you can use it in Tbl_stp_details