PostgreSQL 8 for Windows in .NET framework

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PostgreSQL 8 for Windows
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Defining the Base Table
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For the basic table definition, you need to define the table name and the individual data columns contained in the table For each data column, you also need to declare the data type of the data The format of a basic table definition looks like this:
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CREATE TABLE tablename (column1 datatype, column2 datatype, );
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For tables with lots of columns, this can become quite a long statement Database administrators often split the statement into several command-line entries Remember, by default, PostgreSQL does not process the SQL command until it sees a semicolon Here is an example of creating a simple table in psql:
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C:\Program Files\PostgreSQL\82\bin>psql test2 fred Password for user fred: test2=> create table store"Customer" ( test2(> "CustomerID" varchar, test2(> "LastName" varchar, test2(> "FirstName" varchar, test2(> "Address" varchar, test2(> "City" varchar, test2(> "State" char, test2(> "Zip" char(5), test2(> "Phone" char(8)); CREATE TABLE test2=> \dt store List of relations Schema | Name | Type | Owner + + + store | Customer | table | fred (1 row) test2=> \d store"Customer" Table "storeCustomer" Column | Type | Modifiers + + CustomerID | character varying | LastName | character varying | FirstName | character varying | Address | character varying | City | character varying | State | character(2) | Zip | character(5) | Phone | character(8) | test2=>
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6:
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Using Basic SQL
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There are lots of things to watch for in this example First, by default, PostgreSQL creates all new tables in the public schema for the database you are connected to If you want to create a table in a different schema, you must include the schema name in the CREATE TABLE command Next, notice that the psql command prompt changes when additional input is required to finish the SQL statement as it is entered on multiple lines This helps you keep track of what is expected next when entering commands As you enter the definitions for each column, remember that if you want to use mixed-case letters in the column names, you must enclose the names in double quotes When the CREATE TABLE command is finished, a message is displayed showing the command was successful (if you use the -q command-line option, the command prompt returns with no message if the command is successful) Besides the column data type, you can also add constraints to the column data definition:
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postgres=> create table Employee ( postgres(> EmployeeID int4 primary key, postgres(> Lastname varchar, postgres(> Firstname varchar, postgres(> Department char(5) not null, postgres(> StartDate date default now(), postgres(> salary money); NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "employee_pkey" for table "Employee" CREATE TABLE postgres=>
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In this example, notice that the keyword PRIMARY KEY is used to define a primary key used for indexing the data The PRIMARY KEY keyword forces each data entry in the employeeid column to be both unique and not empty (called null in database terms) An additional constraint is added to the department column, requiring an entry for this column The startdate column uses the PostgreSQL now function (discussed in 8) to enter today s date as a default value each time a record is entered
Adding Additional Table Elements
Once the basic table is created, you can add additional columns, keys, and constraints by using the ALTER TABLE SQL command The format of the ALTER TABLE command is
ALTER TABLE tablename action
The action parameter can be one or more SQL commands used to modify the table Table 6-3 lists and describes the commands available Be careful when altering a table that contains data Altering column information applies to all records already present in the table With the Customer table added earlier,
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