Today I Learned

hashrocket A Hashrocket project

The most generic type of constraint

The Check constraint is the most generic type of constraint.

alter table things add CONSTRAINT corners_must_be_greater_than_0 CHECK (corners > 0);
See More #sql TILs
Looking for help? Hashrocket developers believe that data quality is as important as code quality. We enjoy all the challenges of relational databases, from finding the fastest index, to structuring data to fit the needs of an application. We're eager to share our experiences; check out PG Casts, our series of free PostgreSQL screencasts.