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You have just created your first database table! You also set a primary key, set a serial column, and filled the table with some data. As you can see, as soon as you have a clear idea about the structure of a table, it s relatively easy to use pgAdmin III to create it into your database. Let s move on!

MEMBER PROCEDURE help is begin end help;

If you want users to be able to enter items not in the list, select Yes under Allow Fill-in choices. The New Item and Edit forms allow users to enter a different choice, as shown here:

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Now that you have a table filled with data, let s do something useful with it! The ultimate goal with this table is to get the list of department names from a PHP page and populate the Smarty template with that list. To get data from a database, you first need to know how to communicate with the database. Relational databases understand dialects and variants of SQL. The usual way of communicating with PostgreSQL is to write an SQL command, send it to the PostgreSQL server, and get the results back. In practice, as you ll see later, we prefer to centralize the data access code using PostgreSQL functions, but before you can learn about them, you need to know the basics of SQL.

MEMBER PROCEDURE test is begin end test;

The Structured Query Language (SQL)

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As soon as users select a value from the list, they cannot revert to a blank entry. If you want to allow this option, enter text such as Select from list . . . as the first choice. Users can always revert to that choice to indicate they haven t made a selection. For more information about the Choice column type, see the sidebar Choice vs. Lookup.

TEST_TS.v_TEST_80, TEST_TS.d_TEST_19000101, TEST_TS.d_TEST_19991231 ); TEST_TS.ok(); exception when OTHERS then TEST_TS.error(SQLERRM); end; -- Now that we have test entries, -- let's test the package methods TEST_TS.set_test('WORKER_TYPE_TS', 'get_id()', 2, 'Get the ID for the specified code'); begin n_id := get_id(TEST_TS.v_TEST_30); if n_id > 0 then TEST_TS.ok(); else TEST_TS.error(); end if; exception when OTHERS then TEST_TS.error(SQLERRM); end; TEST_TS.set_test('WORKER_TYPE_TS', 'get_code_descr()', 3, 'Get the code and description for the specified ID'); begin get_code_descr( n_id, v_code, v_description); if v_code = TEST_TS.v_TEST_30 and v_description = TEST_TS.v_TEST_80 then TEST_TS.ok(); else TEST_TS.error(); end if; exception when OTHERS then TEST_TS.error(SQLERRM); end; TEST_TS.set_test('WORKER_TYPE_TS', 'get_code_id_descr()', 4, 'Get the code, ID, and description for the specified code');

SQL is the language used to communicate with modern Relational Database Management Systems (RDBMS). However, we haven t seen a database system yet that supports exactly the SQL 99 and SQL 2003 standards. This means that in many cases, the SQL code that works with one database will not work with the other. Currently, PostgreSQL supports most of SQL 92 and SQL 99. The most commonly used SQL commands are SELECT, INSERT, UPDATE, and DELETE. These commands allow you to perform the most basic operations on the database. The basic syntax of these commands is very simple, as you ll see in the following pages. However, keep in mind that SQL is a very flexible and powerful language that can be used to create much more complicated and powerful queries than what you see here. You ll learn more while building the web site, but for now let s take a quick look at the basic syntax. For more details about any of these commands, you can always refer to the official documentation at http://www.postgresql.org/docs/current/interactive/sql-select.html http://www.postgresql.org/docs/current/interactive/sql-insert.html http://www.postgresql.org/docs/current/interactive/sql-update.html http://www.postgresql.org/docs/current/interactive/sql-delete.html

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The SELECT statement is used to query the database and retrieve selected data that match the criteria you specify. Its basic structure is

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