AS OF query

https://www.ibm.com/docs/en/db2/11.5?topic=tables-querying

https://sqlspreads.com/blog/temporal-tables-in-sql-server/

https://sqlspreads.com/blog/temporal-tables-in-sql-server/

https://learn.microsoft.com/en-us/sql/relational-databases/tables/temporal-tables?view=sql-server-ver16

https://medium.com/@mahesh.15/temporal-system-versioned-tables-119832a16d43