Creating and Altering Tables cis 407 Object Names Create Statement Alter statement Drop Statement.

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Presentation transcript:

Creating and Altering Tables cis 407 Object Names Create Statement Alter statement Drop Statement

GUI v ANSI/TSQL ANSI works with all DBMSs – (e.g., oracle, db2, …) Need a script to insure same DB schema on development, test, production systems Easier (in my opinion)

Object Names in SQL Server [serverName.[DatabaseName.[SchemaName.]]]ObjectN ame Schema Name --- ownership Generally DBO – best to keep all relations in database owned by default DBO role. If my login is given create table authority then that table owned by beard.mytable If fred is db owner (created the database) a table he creates would be owned by fred.mytable Confusing Expensive: if relations in db owned by multiple owners than constantly must check access. –Stick to DBO by having anyone that needs to create tables have db sysadmin role.

Database, server names Select * from northwind.dbo.orders select * from northwind..orders (dbo default) Can access relation on another server Select * from myserver.northwind..orders –Server could be in PRC

Create Database CREATE DATABASE [on primary] ( [name =,] [,SIZE= ] [,MAXSIZE= ] [,filegrowth= ] ) ] [log on [name = ] ] ….. [collate ] ……

CREATE DATABASE Create database Accounting on (name = ‘accounting’, filename = ‘c:\program files\microsoft sql server\MSQL.1\mssql\data\accountingdata.mdf’., size = 10, maxsize = 50, fielgrowth = 5) Log on (name = ‘accountingLog’, filename = ‘c:\program files\microsoft SQL server\ sqsql.1\mssql\data\accountingLog.ldf’, size = 5MB, maxsize = 25MB, filegrowth=5mb) go

Create Table (pg 128) Create table customers ( customerNo intidentity(1,1) not null, customerName varchar(30) not null, address1 varchar(30) not null, address2 varchar(30) not null, ….. See example from web page Exec sp_help customers Tsql data types pg 12-15

Alter Statement Almost identical to create statement but change ‘create’ to ‘alter Don’t want to have to delete relation and recreate (lose all that data!!)

Drop statement Drop customers BE CAREFUL – no “are you sure” questions – it assumes you know what you are doing. Use master drop database accounting