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-- Microsoft SQL Server 2008 T-SQL Fundamentals
-- Chapter 1 - Background to T-SQL Querying and Programming
-- ?2008 Itzik Ben-Gan
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-- Creating Tables
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-- Create a database called testdb
IF DB_ID('testdb') IS NULL
CREATE DATABASE testdb;
GO
-- Create table Employees
USE testdb;
IF OBJECT_ID('dbo.Employees', 'U') IS NOT NULL
DROP TABLE dbo.Employees;
CREATE TABLE dbo.Employees
(
empid INT NOT NULL,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
hiredate DATE NOT NULL,
mgrid INT NULL,
ssn VARCHAR(20) NOT NULL,
salary MONEY NOT NULL
);
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-- Data Integrity
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-- Primary key
ALTER TABLE dbo.Employees
ADD CONSTRAINT PK_Employees
PRIMARY KEY(empid);
-- Unique
ALTER TABLE dbo.Employees
ADD CONSTRAINT UNQ_Employees_ssn
UNIQUE(ssn);
-- Foreign key
IF OBJECT_ID('dbo.Orders', 'U') IS NOT NULL
DROP TABLE dbo.Orders;
CREATE TABLE dbo.Orders
(
orderid INT NOT NULL,
empid INT NOT NULL,
custid VARCHAR(10) NOT NULL,
orderts DATETIME NOT NULL,
qty INT NOT NULL,
CONSTRAINT PK_Orders
PRIMARY KEY(OrderID)
);
ALTER TABLE dbo.Orders
ADD CONSTRAINT FK_Orders_Employees
FOREIGN KEY(empid)
REFERENCES dbo.Employees(empid);
ALTER TABLE dbo.Employees
ADD CONSTRAINT FK_Employees_Employees
FOREIGN KEY(mgrid)
REFERENCES Employees(empid);
-- Check
ALTER TABLE dbo.Employees
ADD CONSTRAINT CHK_Employees_salary
CHECK(salary > 0);
-- Default
ALTER TABLE dbo.Orders
ADD CONSTRAINT DFT_Orders_orderts
DEFAULT(CURRENT_TIMESTAMP) FOR orderts;
