To create lookup table we should write SQL (example with PostgreSQL) SELECT row_number() over (order by uuid) as id_int, uuid from persons This query will return a 2-columns table: uuid and id_int. So ...

It's designed to serve as a practical reference for learning and applying SQL concepts in real-world scenarios. Key features include: Table Creation and Management Defining and creating tables with ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

Once defined, SQL Server will automatically keep up with the rest. Note that there are several special rules about using temporal tables. For example, you may not create INSTEAD OF triggers on a ...