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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

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 “Understand Integrity Constraints” 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 constraint—, the CHECK constraint, —can 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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