When I am working with an Oracle database, I still find myself using SQL*Plus for many quick and dirty database queries. In particular, I often look up constraints in SQL*Plus. In this post, I ...

Furthermore, the unique constraint columns may be set to null. Data type and data length are the most fundamental integrity constraints applied to data in the database. Simply by specifying the data ...

Check Constraints are Supported in all Major DBMSs. Check constraints are supported in all of the major DBMS products, including DB2, Oracle, and SQL Server. But they are too-often ignored and not ...

A constraint restricts the values that can be stored in a table. A constraint checks the values you insert or update in a table against the conditions specified by the constraint. For example, a ...

Real-Time Constraints for a Database. A better approach is to build awareness of real-time constraints in a database system. Some of the considerations are: Database transactions must have a priority.

By using cascading referential integrity constraints, ... Tim Chapman is a SQL Server database administrator who works for a bank in Louisville, KY, and has more than 7 years of IT experience.