[sql] The ALTER TABLE statement conflicted with the FOREIGN KEY constraint

Before You add Foreign key to the table, do the following

  1. Make sure the table must empty or The column data should match.
  2. Make sure it is not null.
  3. If the table contains do not go to design and change, do it manually.

    alter table Table 1 add foreign key (Column Name) references Table 2 (Column Name)

    alter table Table 1 alter column Column Name attribute not null

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