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database
Code for Postgres:
ALTER TABLE users ADD CONSTRAINT enforce_single_not_null_column CHECK(
(CAST(parent_id IS NOT NULL AS int) +
CAST(teacher_id IS NOT NULL AS int)) <= 1)
This Data Warehousing site aims to help people get a good high-level understanding of what it takes to implement a successful data warehouse project
6-part tutorial which will show you how to build out a multi-server production application setup from scratch.