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CHAPTER 1 GEN ESIS
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After I execute these two scripts, I can query WORKER_TYPE_T and get results like this: SQL> SQL> SQL> 2 3 ID -1 2 3 column code format a4; column description format a11; select * from WORKER_TYPE_T order by code; DESCRIPTION ACTIVE_DATE INACTIVE_DATE ----------- ---------------- ---------------Contractor 20070111 181451 Employee 20070111 181451 Unknown 20070111 181451
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HEY! WHAT S WITH THIS _T SUFFIX ON THE TABLE NAME
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The _T suffix has to do with coding conventions (or standards), which all professional programmers follow religiously (really I m not kidding here). Here s the deal: I m not only going to teach you how to code PL/SQL for relational data, but also object-relational data. So while I normally would not suffix a table name with _T, I am doing that here in order to allow both the relational and object-relational examples to exist in the database at the same time. I ll use the suffix _T for relational tables and the suffix _OT for object-relational tables. As long as I have your attention and we re focusing on SQL in this chapter, let me take a moment to talk about my SQL coding conventions.
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SQL Coding Conventions
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In the refresher part of this chapter, I capitalized the SQL keywords so it would be easy for you to notice them in the syntax statement that followed their use. In practice, I don t do that. When I code SQL, I follow these simple rules: I type table names in all caps, literals in uppercase/lowercase/mixed case as required, and everything else in lowercase. Why First, since SQL is table-centric, I want table names to stick out like a sore thumb. Second, lowercase is actually easier to read. And finally, lowercase is easier to type, and after 30 years of typing, you ll know why that s important. I format my code so column names, table names, and parameters in WHERE clauses all line up in nice left-justified columns. That way, the text is easy to scan. I name scripts with the same name as the object they are creating, dropping, inserting, updating, and so on, and an appropriate filename extension in order to make the names of the scripts as obvious as possible.
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C HA PTER 1 G ENES IS
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SQL Filename Extension Conventions
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The following are the filename extensions I use: .tab: Create table .alt: Alter table (to add, modify, or drop a column) .ndx: Create index .pkc: Alter table/add constraint/primary key (usually included in the create table script) .fkc: Alter table/add constraint/foreign key (usually included in the create table script) .ukc: Alter table/add constraint/unique (usually included in the create table script) .drp: Drop table .ins: Insert into .upd: Update .del: Delete from .sql: Select from
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It s Your Turn to Create Code Tables
Now that you ve seen me do it, you should be able to code the scripts to do the same for the GENDER, HAZARD_LEVEL, and WORKPLACE_TYPE code tables (pssst, don t forget to suffix them with _T). Code the scripts, saving them with the filenames gender_t.tab, hazard_level_t.tab, and workplace_type_t.tab, respectively. Then execute each script. You can see my solutions to these scripts in the book s source code directory for 2. Now let s move on to creating content tables.
Create a Content Table
This time, let s create some content tables. I ll write the first two scripts, and then you do the rest. Listing 1-28 is a script to create the WORKER table. Listing 1-28. DDL to Create the WORKER Table, worker.tab 01 02 03 04 05 06 07 08 rem worker_t.tab rem by Donald J. Bales on 12/15/2006 rem --drop table WORKER_T; create table WORKER_T ( id worker_type_id
number number
not null, not null,
CHAPTER 1 GEN ESIS
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external_id varchar2(30) first_name varchar2(30) middle_name varchar2(30), last_name varchar2(30) name varchar2(100) birth_date date gender_id number tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); --drop sequence WORKER_ID_SEQ; create sequence WORKER_ID_SEQ start with 1; --drop sequence EXTERNAL_ID_SEQ; create sequence EXTERNAL_ID_SEQ start with 100000000 order; alter table WORKER_T add constraint WORKER_T_PK primary key ( id ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table WORKER_T add constraint WORKER_T_UK1 unique ( external_id ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table WORKER_T add constraint WORKER_T_UK2 unique ( name, birth_date, gender_id ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table WORKER_T add constraint WORKER_T_FK1 foreign key ( worker_type_id ) references WORKER_TYPE_T ( id );
not null, not null, not not not not null, null, null, null )
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