SQL Server tutorial part 6 - Check constraints

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Definition

Check Constraint is used to limit range that can be placed in a column

Check Constraint Column level

Create Table UserDetails(
  DetailId int,
  Username Varchar(100),
  Gender char(1) Constraint user_gender check(Gender in ('M', 'F'))
  --Will allow to enter either 'M' or 'F' in gender column
)
Column Level.sql - Snippet hosted by Cacher
RAW

Check Constraint Table level 

Create Table UserDetails(
  DetailId int,
  Username Varchar(100),
  Gender char(1),
  Fees numeric(8,2),
  Constraint user_fees Check(Fees >= 500)
)
TableLevel.sql - Snippet hosted by Cacher
RAW

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