O'Reilly logo

Oracle Database 11g & MySQL 5.6 Developer Handbook by Michael McLaughlin

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

image

image

onstraints are critical components in databases. They restrict (constrain) what you can add, modify, or delete from tables with INSERT, UPDATE, and DELETE statements. Constraints let you restrict what can be placed in columns, rows, tables, or relationships between tables. That’s a tremendously broad statement that requires some qualification. So what are these restrictions and why are they important?

As with the prior chapter, this chapter develops what and why before delving into the SQL implementation of database constraints that work with ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required