sql - Finding columns that do not match existing primary key -

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I am trying to add a foreign key to a table, but the database does not like it, SQL Server 2005, it does not like it.

It says that columns do not match existing primary key or unique constraints.

How do I get a column in questions so that I can delete or change them and add foreign keys?

Join a left in the parent table on the question, then check the values ​​in the child's table where Join the left parent's table is zero. For example, if this was your schema ... 

  table1: myKey int primary key, ... other columns ... Table 2: Other Key difference primary key, myKeyFromTable1 int ... other columns ..

you want to do this: 

  separate t2.myKeyFromTable1 from table 2 t2

This will give you a special value in table2 which is left in the table 1 t1 on t1.myKey = t2.myKeyFromTable1 table1 < There will be no related parents with / code>.


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