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Creating and Altering Tables cis 407

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).

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Creating and Altering Tables cis 407

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  1. Creating and Altering Tablescis 407 Object NamesCreate StatementAlter statementDrop Statement

  2. 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)

  3. Object Names in SQL Server • [serverName.[DatabaseName.[SchemaName.]]]ObjectName • 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.

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

  5. Create Database • CREATE DATABASE <database name>[on primary] ( [name = <‘logical file name’>,] [,SIZE=<size in kilo,.., terabytes>] [,MAXSIZE= <size in kilo,…,terabytes>] [,filegrowth=<kilo,…, terabytes>] ) ][log on [name = <‘logical file name’>] ] …..[collate <collation name> ]……

  6. CREATE DATABASE • Create database Accountingon (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

  7. Create Table (pg 128) • Create table customers (customerNo int identity(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

  8. 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!!)

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

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