Question : For one of my columns I am trying to enforce a pattern. The first letter should be D […]
Tag: check-constraints
PostgreSQL – Removing Unused Index on Check Constraint column
Question : I used the script from this blog to identify the unused index on my database. It returns an […]
CHECK constraint for array column to verify length > 0
Question : I’m playing with postgres table validation rules and trying to set a CHECK constraint for an array column. […]
Adding a check constraint on a new column with default value on a large table
Question : I have a large table (1–2m rows) and need to add a column. It is an integer column […]
Fire a trigger function when checks change
Question : I have the following use case: I have a set of different checks on different tables in one […]
MySQL – is there a way to implement a CHECK constraint after creating the table?
Question : I created a table and after entering all the data, I found that I had missed a CHECK […]
What happens when play with constraints [closed]
Question : Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the […]
How to implement an association with restrictions
Question : I’m working on an SQL database of useful plants. I’d like to be able to allow users to […]
Building a conditional check constraint
Question : I’m trying to build a conditional check constraint for my table TBL_AFIL, which has two fields: Fec_Renun DATE […]
Postgres: How is SET NOT NULL “more efficient” than CHECK constraint
Question : In PostgreSQL docs for Constraints, it says A not-null constraint is functionally equivalent to creating a check constraint […]