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Relationships between tables can be physically enforced in the database using FOREIGN KEY constraints, or simply foreign keys. You learned in the previous chapter about the PRIMARY KEY and UNIQUE constraints. We covered them there because they apply to the table as an individual entity. Foreign keys, on the other hand, occur between two tables: the table in which the foreign key is defined (the referencing table) and the table the foreign key references (the referenced table).

C HA PTER 6 JUS T LIK E IT IS IN THE REA L WORLD!

Actually, the referencing table and the referenced table can be one and the same. This isn t seen too Tip

You can add totals to any of the columns in a list. You can use any of seven summation functions: Count, Average, Maximum, Minimum, Sum, Std Deviation, and Variance. Select the function you want to use on the drop-down list adjacent to the column to which you want it applied.

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often in practice, but it s not unusual either. For example, you can have a table with employees, where each employee references the employee that is his or her boss (in this scenario the big boss would probably reference itself).

if aio_worker.id is not NULL then -- retrieve the row by the primary key select value(w) into o_worker from WORKER_OT w where id = aio_worker.id; elsif aio_worker.external_id is not NULL then -- retrieve the row by the external unique key select value(w) into o_worker from WORKER_OT w where external_id = aio_worker.external_id; else -- retrieve the row by the name, birth_date, and gender select value(w) into o_worker from WORKER_OT w where name = worker_o.get_formatted_name( aio_worker.first_name, aio_worker.middle_name, aio_worker.last_name) and birth_date = aio_worker.birth_date and gender_id = aio_worker.gender_id; end if; return o_worker; exception when NO_DATA_FOUND then raise; when OTHERS then raise_application_error(-20001, SQLERRM|| ' on select WORKER_OT'|| ' in WORKER_O.get_row()'); end get_row;

A foreign key is a column or combination of columns used to enforce a link between data in two tables (usually representing a One-to-Many relationship). Foreign keys are used both as a method of ensuring data integrity and to establish a relationship between tables. To enforce database integrity, the foreign keys, like the other types of constraints, apply certain restrictions. Unlike PRIMARY KEY and UNIQUE constraints that apply restrictions to a single table, the FOREIGN KEY constraint applies restrictions on both the referencing and referenced tables. For example, if you enforce the One-to-Many relationship between the department and category tables by using a FOREIGN KEY constraint, the database will include this relationship as part of its integrity. It will not allow you to add a category to a nonexistent department, nor will it allow you to delete a department if there are categories that belong to it.

If you re using Group By, SharePoint positions the total at the top of the group. Figure 4-11 shows totals for the entire column (Flight Miles), for the group (From), and for the subgroup (Fare Class).

STATIC FUNCTION get_unformatted_name( aiv_first_name in varchar2, aiv_middle_name in varchar2, aiv_last_name in varchar2) return varchar2 is begin return upper(replace(replace(replace(replace(replace( aiv_last_name||aiv_first_name||aiv_middle_name, '''', NULL), ',', NULL), '-', NULL), '.', NULL), ' ', NULL)); end get_unformatted_name;

CH APT ER 6 JUST LI KE IT IS I N T HE REAL WO RLD !

You now know the general theory of foreign keys. In the following exercises, you ll put into practice the new theory you learned on table relationships by creating and populating these tables: category product product_category

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Figure 4-11. By adding a total to a grouped list, you can generate sums for the entire column, for the group, and for the subgroup.

The process of creating the category table is pretty much the same as for the department table you created in 2. The category table will have four fields, described in Table 4-1. Table 4-1. Designing the category Table

varchar2, varchar2, varchar2) boolean is number;

SERIAL INTEGER VARCHAR(50) VARCHAR(1000)

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