Top Answers

1. ERROR 1826: Duplicate foreign key constraint name
   3 votes
2. ORA-01843: not a valid month when inserting a date
   3 votes
3. Running database creation script with constraints
   2 votes
4. SQL row_number() - how to ignore nulls?
   1 votes
5. How to calculate percentage of certain value in column with sql?
   1 votes