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implementing constraints
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In this practice, you add constraints when adding a new table. You also modify an existing table by adding constraints to it. Because the exercises build on each other sequentially, it is important to do them in the order specified.
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e xercise 1
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Create a New Table with Constraints
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In this exercise, you create two tables that will be used to store a list of customers and their respective orders. You also define basic constraints on the two tables.
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1. 2.
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If necessary, open SSMS and connect to an instance of SQL Server 2008. In a new query window, type and execute the following SQL statements to create the TestDB database with the Test schema:
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CREATE DATABASE TestDB; GO
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USE TestDB; GO
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CREATE SCHEMA Test; GO
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In the query window, create a new table with the following properties:
n n n
It should be named Customers. It should exist in the Test schema. It should have the following columns:
CustomerId, which must be a whole number between 1 and 100,000. This column should also be given increasing values automatically. Use the data type that requires the least storage space. The first value should be 1,000, and then
Tables, Data Types, and Declarative Data Integrity
each following row should be given a new value increased by 1. This value should be the table s primary key.
Name, which should be a string that can be up to 50 characters long.
No columns should allow NULL values.
The correct statement follows but don t look at it before you have tried to create the table yourself. Type, highlight, and execute the following statement:
CREATE TABLE Test.Customers ( CustomerId INT IDENTITY(1000, 1) NOT NULL CONSTRAINT PKCustomers PRIMARY KEY ,Name NVARCHAR(50) NOT NULL );
In the query window, create a new table with the following properties:
n n n
It should be named Orders. It should exist in the Test schema. It should have the following columns:
OrderId, which must be a whole number between 1 and 100,000. This column should also be given increasing values automatically. Use the data type that requires the least storage space. The first value should be 1,000, and then each following row should be given a new value increased by 1. This value should be the table s primary key. OrderDate, which must be a date. CustomerId, which must reference a row with the same value in the CustomerId column of the Test.Customers table.
If no value is provided, today s date should be added automatically.
No columns should allow NULL values.
The correct statement follows but don t look at it before you have tried to create the table yourself. Type, highlight, and execute the following statement:
CREATE TABLE Test.Orders ( OrderId INT IDENTITY(1000, 1) NOT NULL ,OrderDate DATE NOT NULL DEFAULT SYSDATETIME() ,CustomerId INT NOT NULL CONSTRAINT FKOrdersCustomerId REFERENCES Test.Customers (CustomerId) );
Lesson 2: Declarative Data Integrity
e xercise 2
Add More Constraints
In this exercise, you add further constraints to the tables that you created in Exercise 1.
1. 2.
If necessary, open SSMS and connect to the appropriate instance of SQL Server 2008. In a new query window, type and execute the following SQL statements to use the TestDB database:
USE TestDB; GO
In the query window, add a constraint that verifies that the Name column in the Test.Customers table must start with a letter and be at least three characters long. The correct statement follows but don t look at it before you have tried to create the constraint yourself. Type, highlight, and execute the following statement:
ALTER TABLE Test.Customers ADD CONSTRAINT CKCustomerName CHECK(Name LIKE N'[A-Z]__%');
In the query window, add a constraint that verifies that the OrderDate column in the Test.Orders table must contain today s date. The correct statement follows but don t look at it before you have tried to create the constraint yourself. Type, highlight, and execute the following statement:
ALTER TABLE Test.Orders ADD CONSTRAINT CKOrdersOrderDate CHECK(OrderDate = CAST(SYSDATETIME() AS DATE));
To clean up after this lab, close all open query windows in SSMS, open a new query window, and execute the following SQL statements:
USE master; GO
DROP DATABASE TestDB;
Tables, Data Types, and Declarative Data Integrity
chapter Review
To practice and reinforce the skills you learned in this chapter further, you can perform the following tasks:
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