Sql coding for beginners: An essential tool for developers using SQL statements for controlling and modifying tables, and an intermediate-level guide for learning SQL programming step by step by Coding Tony
Author:Coding, Tony [Coding, Tony]
Language: eng
Format: epub
Published: 2020-09-09T16:00:00+00:00
Define CHECK Constraints
Earlier in the chapter, in the âUnderstand Integrity Constraintsâ section, I discussed the various constraint categories and the types of constraints they support. (Refer back to Figure 4-1 for an overview of these categories.) One type of constraintâ, the CHECK constraint, âcan be defined as table constraints, column constraints, domain constraints, or within assertions. A CHECK constraint allows you to specify what values can be included in a column. You can define a range of values (for example, between 10 and 100), a list of values (for example, blues, jazz, pop, country), or a number of other conditions that restrict exactly what values are permitted in a column.
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