If all I needed is the name of the table with multiple foreign keys then of course you are right. However, I also want to know the names of the foreign keys. I believe that necessitates the use of the LAG and LEAD functions.

You are right that filtering on constraint_type is not really necessary.

Thanks for your comment.

best regards,

Lucas

nice usage of LAG and LEAD. I think these analytical functions are very powerful and quite useful from time to time.

But couldn’t the original problem, “Table Definitions having multiple foreign keys to the same referenced table”, be solved using a simpler (and probably faster) method?

select fk.table_name
from user_constraints fk
, user_constraints pk
where fk.r_constraint_name = pk.constraint_name
and fk.constraint_type = ‘R’
group by fk.table_name
, pk.table_name
having count(*) > 1

(The fk.constraint_type = ‘R’ condition is not really necessary, because r_constraint_name will be NULL for any but foreign key constraints, but it does tend to perform better when it is included)

Roland Bouman

Thanks for the compliment and of course you can! I like that.

best regards,

Lucas