A constraint checks the values you insert or update in a table against the conditions specified by the constraint. For example, a constraint could ensure that the value entered for the column GENDER ...

What does relational database actually mean? Find out inside PCMag's comprehensive tech and computer-related encyclopedia.

The evolving landscape of NoSQL databases and NoSQL database management systems (NoSQL DBMS) has everything to do with Big Data analytics.

Can NoSQL handle mission-critical workloads in the Enterprise? Will NoSQL and relational technologies coalesce? MarkLogic's Senior Product Marketing Manager shares his thoughts.

A question asked about data contained in two or more tables in a relational database. The relational query must specify the tables required and what the condition is that links them; for example ...

“You can think in a relational manner, you can program it like a relational database, but it doesn’t [have] all the relational constraints,” Youngman said.

Google Cloud Spanner is a managed distributed database that has the scalability of NoSQL databases while retaining SQL compatibility, relational schemas, ACID transactions, and external consistency.

Business constraints require more in-depth knowledge than relational constraints, which enforce rules fundamental to any database.