2026 - Philipp Salvisberg's Blog

2026-03-09

2026-03-09

Using SQL Assertions to Enforce Temporal Data Integrity

Introduction More than twelve years ago, I described the multi-temporal features of Oracle Database in this blog post. In the conclusion, I wrote that I missed a temporal DML API, temporal integrity constraints, temporal joins, and temporal aggregations. These features are still missing today. However, in the latest version of Oracle AI […]

2026-02-23

Enforcing Acyclic Hierarchies With SQL Assertions

Introduction Referential integrity constraints have been available since version 7 of the Oracle Database. While these constraints ensure that referenced rows exist, they cannot express more complex integrity rules that span multiple rows or tables. Check constraints are similarly limited, as they can only validate conditions on the columns of a single […]

2026-01-02

Fighting Bad PL/SQL & SQL with VS Code

The success of a project or product depends largely on the quality of the code. But how can I improve security, maintainability or performance? More importantly, how can I prevent code with quality defects from entering production? In addition to testing, code analysis plays a central role. These days, code can be […]