Databases should but many don't have foreign key constraints. Does your database have them? To what extent? Here is a method to measure your database.
List of SQL queries for SQL Server Catalog / Data Dictionary handy for any DBA.
A compilation of best practices documenting stored procedures and functions in relational databases.
There are 2 very common traps (with serious consequences) you can easily fall into while joining tables in an SQL query. Learn what they are and how to avoid them.
List of SQL queries for Oracle Data Dictionary handy for any Oracle DBA.
See what polls tell us about software developers' struggles in the area of databases.