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alter table WORKER_T add constraint WORKER_T_FK2 foreign key references GENDER_T
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Looks familiar, doesn t it It looks a lot like the code table scripts you created earlier. The exceptions are lines 51 through 54 and 56 through 59, where I ve added DDL to create two foreign key (FK) constraints. The first foreign key creates an integrity constraint between the code table WORKER_TYPE_T, while the second does the same for code table GENDER_T. These constraints will prevent anyone from deleting a code that is in use by the WORKER_T table. Listing 1-29 shows the code to create the LOGICAL_WORKPLACE table. I m showing you this listing because this table has some interesting new columns: parent_id and id_context. Listing 1-29. DDL to Create the LOGICAL_WORKPLACE Table, logical_workplace_t.tab 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 rem logical_workplace_t.tab rem by Donald J. Bales on 12/15/2006 rem --drop table LOGICAL_WORKPLACE_T; create table LOGICAL_WORKPLACE_T ( id number parent_id number, id_context varchar2(100) workplace_type_id number code varchar2(30) name varchar2(80) active_date date default SYSDATE inactive_date date ) tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); --drop sequence LOGICAL_WORKPLACE_ID_SEQ; create sequence LOGICAL_WORKPLACE_ID_SEQ start with 1; alter table LOGICAL_WORKPLACE_T add constraint LOGICAL_WORKPLACE_T_PK primary key ( id ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table LOGICAL_WORKPLACE_T add constraint LOGICAL_WORKPLACE_T_UK1 unique ( id_context )
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CHAPTER 1 GEN ESIS
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using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table LOGICAL_WORKPLACE_T add constraint LOGICAL_WORKPLACE_T_UK2 unique ( code, name, active_date ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table LOGICAL_WORKPLACE_T add constraint LOGICAL_WORKPLACE_T_FK1 foreign key ( parent_id ) references LOGICAL_WORKPLACE_T ( id ); alter table LOGICAL_WORKPLACE_T add constraint LOGICAL_WORKPLACE_T_FK2 foreign key ( workplace_type_id ) references WORKPLACE_TYPE_T ( id );
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A logical workplace like a department may belong to a business unit, while its business unit may belong to a company. The parent_id column allows you to store the id of a department s parent business unit with the department, so you can document the organization hierarchy. With this information, you can present an organization chart, find everyone in a business unit, and so on. The id_context column is a convenience or performance column for the mechanics of querying the database. You are going to write a PL/SQL function that will create an ID context string for this column. The ID context string will list all of the parent IDs, plus the logical workplace ID of the current row, separated by a known character, such as a period (.) for example, 1.13.14. This will greatly improve the performance of any LIKE queries against the hierarchy of the organizations in the table.
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It s Your Turn to Create Content Tables
Now that you ve seen me do it, you should be able to code the scripts to do the same for the WORK and PHYSICAL_WORKPLACE tables (again, don t forget to suffix them with _T). So code the scripts, saving them with the filenames work_t.tab and physical_workplace_t.tab, respectively. Then execute each script. You can view my solutions to these scripts in the book s source code directory for 2. Now let s move on to creating intersection tables.
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Create an Intersection Table
It s time to create some intersection tables. I ll write the first script, and then you write the rest. Listing 1-30 is a script to create the LOGICAL_ASSIGNMENT table. Listing 1-30. DDL to Create the LOGICAL_ASSIGNMENT Table, logical assignment_t.tab 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 rem logical_assignment_t.tab rem by Donald J. Bales on 12/15/2006 rem --drop table LOGICAL_ASSIGNMENT_T; create table LOGICAL_ASSIGNMENT_T ( id number worker_id number logical_workplace_id number active_date date default SYSDATE inactive_date date ) tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); --drop sequence LOGICAL_ASSIGNMENT_ID_SEQ; create sequence LOGICAL_ASSIGNMENT_ID_SEQ start with 1; alter table LOGICAL_ASSIGNMENT_T add constraint LOGICAL_ASSIGNMENT_T_PK primary key ( id ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table LOGICAL_ASSIGNMENT_T add constraint LOGICAL_ASSIGNMENT_T_UK unique ( worker_id, active_date ) using index tablespace USERS pctfree 20 storage (initial 10K next 10K pctincrease 0); alter table LOGICAL_ASSIGNMENT_T add constraint LOGICAL_ASSIGNMENT_T_FK1 foreign key ( worker_id ) references WORKER_T ( id );
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