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PostgreSQL 8 for Windows
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After creating a database object, next up is the schema As described in 4, a database can contain multiple schemas, which in turn contain the tables, views, and various functions Often a database administrator will create separate schemas for each application within the database Just as with the database, normally only the superuser should create schemas for database users The format of the CREATE SCHEMA command is
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CREATE SCHEMA [schemaname] [AUTHORIZATION username [schema elements]]
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The first oddity you may notice with this command format is that the schemaname value is optional If it is not listed, PostgreSQL uses the Login Role value as the schema name The AUTHORIZATION parameter defines the user who will be the schema owner By default, the schema owner is the user who creates the schema Only the superuser can use the AUTHORIZATION parameter to specify a different user as the schema owner A unique feature of the CREATE SCHEMA command is that you can add additional SQL commands to the CREATE command to create schema objects (tables, views, indexes, sequences, and triggers) and grant privileges to users for the schema The new schema is created in the database you are currently connected to By default, this is shown in the psql command prompt A list of existing schemas in the database can be displayed using the PostgreSQL \dn meta-command:
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test2=# \dn List of schemas Name | Owner + information_schema | postgres pg_catalog | postgres pg_toast | postgres public | postgres (4 rows) test2=#
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The information_schema, pg_catalog, and pg_toast schemas are internal PostgreSQL system schemas, created when the database object is created The public schema is also created by PostgreSQL automatically when the database object is created, and is used as the default schema for the database The following example creates a new schema named store in the test2 database created earlier, and makes the Login Role fred the schema owner:
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test2=# create schema store authorization fred; CREATE SCHEMA test2=# \dn List of schemas Name | Owner + information_schema | postgres pg_catalog | postgres pg_toast | postgres public | postgres store | fred (5 rows) test2=#
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If you need to remove a schema, use the DROP SCHEMA command:
DROP SCHEMA schemaname [CASCADE | RESTRICT]
By default, the RESTRICT parameter is enabled This allows the schema to be removed only if it is empty If there are any objects (such as tables, views, and triggers) created in the schema, by default the DROP SCHEMA command will fail Alternatively, if you really want to remove the schema and all of the objects it contains, you must use the CASCADE parameter
Creating a Table
By far the most common CREATE SQL command you will need to use is the CREATE TABLE command Tables hold all of the application data Advanced planning must be used to ensure that the application tables are created properly Often, poor table design is the cause of many failed applications Whenever possible, use standard relational database techniques to match related data elements together within the same table (such as all customer data in the Customer table, and all product data in the Product table) Each data table must define the individual data elements (columns) contained in the table, the data type used for each data element, whether any of the columns will be used as a primary key for the table, whether any foreign keys need to be defined, and whether any table constraints should be present (such as requiring a column to always have a value) All of this information can make the CREATE TABLE command extremely complex Instead of trying to include all of the information required to create a table in one SQL CREATE command, often database administrators utilize the ALTER TABLE SQL command This command is used to alter the definition of an existing table Thus, you can create a base definition of a table using the CREATE TABLE command, then add additional elements using ALTER TABLE commands The following sections go through the process of creating a new table and adding additional elements to the base table
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