PostgreSQL 8 for Windows in Visual Studio .NET

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PostgreSQL 8 for Windows
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ALTER Action ADD COLUMN columnname DROP COLUMN columnname ALTER COLUMN columnname action SET DEFAULT value DROP DEFAULT SET NOT NULL DROP NOT NULL SET STATISTICS SET STORAGE ADD constraint DROP constraint DISABLE TRIGGER ENABLE TRIGGER OWNER loginrole SET TABLESPACE newspace RENAME COLUMN oldname TO newname RENAME TO newname
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Description Add a new column to the table Remove an existing column from the table Change the elements of an existing column Can be used to change data type, add keys, or set constraints Set a default value for an existing column Remove a defined default value of an existing column Define the NOT NULL constraint on an existing column Remove a NOT NULL constraint from an existing column Enable statistic gathering used by the ANALYZE command Define the storage method used to store the column data Add a new constraint to the table Remove a constraint from the table Disable (but not remove) a trigger defined for the table Define a new trigger for the table Set the table owner Change the tablespace where the table is stored to newspace Change the name of table column oldname to newname Change the name of the table to newname
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SET SCHEMA newschema Change the schema location of the table to newschema
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Table 6-3 ALTER TABLE Actions
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I did not specify the primary key, and the constraint on the Phone column I can now add those using the ALTER TABLE command:
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test2=> alter table store"Customer" add primary key ("CustomerID"); NOTICE: ALTER TABLE / ADD PRIMARY KEY will create implicit index "Customer_pkey" for table "Customer" ALTER TABLE test2=> alter table store"Customer" alter column "Phone" set not null; ALTER TABLE test2=> \d store"Customer" Table "storeCustomer" Column | Type | Modifiers + + CustomerID | character varying | not null LastName | character varying | FirstName | character varying | Address | character varying | City | character varying | State | character(2) | Zip | character(5) | Phone | character(8) | not null Indexes: "Customer_pkey" PRIMARY KEY, btree ("CustomerID") test2=>
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Here are a few other examples of using the ALTER TABLE command:
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postgres=> alter table employee rename to employees; ALTER TABLE postgres=> alter table employees add column birthday date; ALTER TABLE postgres=> alter table employees rename column birthday to bday; ALTER TABLE postgres=> alter table employees alter column bday set not null; ALTER TABLE postgres=> \d employees Table "publicemployees" Column | Type | Modifiers + + employeeid | integer | not null lastname | character varying | firstname | character varying | department | character(5) | not null startdate | date | default now() salary | money | bday | date | not null Indexes: "employee_pkey" PRIMARY KEY, btree (employeeid) postgres=> alter table employees drop column bday; ALTER TABLE postgres=>
PostgreSQL 8 for Windows
As a final check of your work, you can start the pgAdmin III program (as demonstrated in 4) and look at the newly created database, schema, and tables in the graphical display
Creating Group and Login Roles
Once you have your tables created, you probably need to create some Group and Login Roles to control access to the data As was discussed in 4, PostgreSQL uses Login Roles to act as user accounts that can log into the system, and Group Roles to control access privileges to database objects Login Roles are assigned as members of the appropriate Group Roles to obtain the necessary privileges Both of these roles are created using the CREATE ROLE SQL command The basic form of the CREATE ROLE command is
CREATE ROLE rolename [[WITH] options]
As expected, there are lots of options that can be used when creating a role Table 6-4 lists and describes the options that can be used
Option ADMIN rolelist CONNECTION LIMIT value CREATEDB CREATEROLE ENCRYPTED IN ROLE rolelist INHERIT LOGIN NOLOGIN PASSWORD passwd ROLE rolelist SUPERUSER
Description Add one or more roles as administrative members of the new role Limit the number of connections the role can have to the database The default is -1, which is unlimited connections Allow the role to create databases on the system Allow the role to create new roles on the system Encrypt the role password within the PostgreSQL system tables List one or more roles that the new role will be a member of Specify that the role will inherit all of the privileges of roles it is a member of Specify that the role can be used to log into the system (a Login Role) Specify that the role cannot be used to log into the system (a Group Role) Specify the password for the role List one or more roles that will be added as members to the new role Specify that the new role will have superuser privileges Only the superuser can use this option
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