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Tag: constraint
How to set constraint sql 2 colume, Data is not available elsewhere and must be used only
Question : How to set constraint sql 2 colume, Data is not available elsewhere and must be used only. Example […]
Oracle Procedure to Enable/Disable all constraints
Question : I have this nice piece of code: begin for i in ( select constraint_name, table_name from user_constraints where […]
How to add constraint on a varchar column to have at least one non numeric character
Question : I am trying to implement some constraints on tables so that there is no tampering of the data […]
Is it possible to enforce corresponding hierarchies?
Question : I constructed the following toy example to illustrate my question. The left side of the schema describes a […]
Does any kind of constraint in a database have a unique constraint name?
Question : I know that it is possible and even encouraged to add primary key constraints and foreign key constraints […]
Postgres: Can I associate index with FK constraint?
Question : Postgres FK constraint and index are independent. Recently I was looked for unused indexes and found trick to […]
Postgresql uses slower constraint over faster index
Question : I have a few tables (25m records +) which have a very INSERT, UPDATE and DELETE biased workload […]
Making a column immutable in MySQL
Question : I want to make a column in a relation unmodifyable for consistency reasons. The backstory is that I […]
MySQL import LOCK doesn’t prevent PRIMARY key issues
Question : I am using Django and only want to backup mysql data (not it’s structure; Django will do that, […]