Re: Inheritance proposal

Tue, 09 Aug 2005 06:13:26 -0700 

Hi,
I discussed the inheritance proposal with Michael today and we came up with a couple of questions I added below. 


The following table describes the inheritance strategy setting for each 
class for the 5 inheritance mappings. I abbreviated the inheritance 
strategies: new -> new-table, super -> superclass-table, sub-> 
subclass-table.


Class            Mapping0  Mapping1  Mapping2  Mapping3  Mapping4
-----------------------------------------------------------------
Person             new       new       new       new       new
Employee           super     new       ?         sub       new
FullTimeEmployee   super     new       new       new       super
PartTimeEmployee   super     new       new       new       super
Insurance          new       new       ?         sub       new
DentalInsurance    super     new       new       new       super
MedicalInsurance   super     new       new       new       super

Questions:

- What is a reasonable inheritance strategy for the abstract classes 
Employee and Insurance in Mapping2? The mapping does not define a table 
for the abstract classes, so new-table does not make sense. I see two 
options: either "subclass-table" or the abstract class does not define 
an inheritance strategy at all.
- Does JDO require a inheritance element for classes in an inheritance 
hierarchy? If not, is there a default? The same questions apply to the 
strategy attribute inside of the inheritance element.
- Can I figure out whether inherited fields are mapped to the superclass 
or subclass table by just looking at the inheritance strategy? I think 
the answer is no, correct? So is it the existence of the nested <join> 
elements that determines only declared fields are mapped? Mapping1 and 
Mapping2 have this difference. Mapping1 maps only declared field where 
Mapping2 uses tables for all the fields (including inherited fields) per 
class.


Regards Michael


Hi,


in t-conference, Jul 8, Craig proposed 5 inheritance mappings that TCK 
should implement. Below, you find a description of each mapping.



All mappings are based on the company model. The company model defines 
two inheritance hierarchies:


              Person                            Insurance
                 |                              /        \
             Employee                DentalInsurance  MedicalInsurance
             /       \
FullTimeEmployee   PartTimeEmployee


The proposal is to define a separate schema and separate ORM metadata 
for each mapping. Each mapping below specifies the ORM inheritance 
strategy for each class. Note, that the first mapping (Mapping 0) is 
already implemented by TCK:


- Mapping 0 (implemented by TCK):

The same table for all classes in the inheritance hierarchy. That table 
specifies a discriminator column, identiying the actual type of each row.
Person and Insurance have inheritance strategy "new-table". Tables of 
these classes have dicriminator columns.

All other classes have inheritance strategy "superclass-table".

- Mapping 1:

Separate table for each class in the inheritance hierarchy. Each table 
contains columns for the declared fields. There are no discriminator 
columns. Instead, there are FKs from subclass tables to superclass 
tables. The ORM metadata specifies nested <join> elements for all 
subclasses. All classes have inheritance strategy "new-table".


- Mapping 2:

Separate table for each class in the inheritance hierarchy. No tables 
for abstract classes Employee and Insurance. Each table contains columns 
for all fields including fields of superclasses.
There are no FKs from subclass tables to superclass tables. The ORM 
metadata does not specifies nested <join> elements. There are no 
discriminator columns.

All classes have inheritance strategy "new-table".

Some additional constraints: Managers, mentors, hradvisors, and 
employees of the month are fulltime employees. Only fulltime employees 
can have insurances, can be project members, and can be project 
reviewers. Separate phone number type tables for persons, fulltime 
employees, and parttime employees.


- Mapping 3:
Person has inheritance strategy "new-table.
Employee has inheritance strategy "subclass-table".

PartTimeEmployee and FullTimeEmployee have inheritance strategy 
"new-table".

Insurance has inheritance strategy "subclass-table".
MedicalInsurance and DentalInsurance have inheritance strategy "new-table".

The ORM metadata specifies nested <join> elements for classes 
PartTimeEmployee and FullTimeEmployee. Tables of these classes have FKs 
to table of class Person. There are no discriminator columns.


- Mapping 4:

Person, Employee, and Insurance have inheritance strategy "new-table". 
PartTimeEmployee, FullTimeEmployee, MedicalInsurance, and 
DentalInsurance have inheritance strategy "superclass-table".
The ORM metadata specifies a nested <join> element for class Employee. 
The table of class Employee has a FK to the table of class Person.

The tables of classes Employee and Insurance have discriminator columns.


Attached you find schema files for each mapping. All attached schema 
files implement application identity. Note, that I did not attach the 
schema for "Mapping 0", as you find that in your workspace.


Please review and comment!

Regards,
Michael


------------------------------------------------------------------------

-- SchemaType: application identity


-- Inheritance mapping: 
-- Person, Employee, and Insurance have inheritance strategy "new-table". 
-- PartTimeEmployee, FullTimeEmployee, MedicalInsurance, and DentalInsurance

-- have inheritance strategy "superclass-table".
-- See tables "persons", "employees", and "insuranceplans".

connect 'jdbc:derby:jdotckdb;create=true' user 'tckuser' password 'tckuser';

CREATE SCHEMA applicationidentity4;
SET SCHEMA applicationidentity4;

-------------------------
-- company
-------------------------

ALTER TABLE departments DROP CONSTRAINT EMP_MO_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_PROJ_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_REV_FK;
DROP TABLE insuranceplans;
DROP TABLE project_reviewer;
DROP TABLE project_member;
DROP TABLE employee_phoneno_type;
DROP TABLE employees;
DROP TABLE persons;
DROP TABLE projects;
DROP TABLE departments;
DROP TABLE companies;

CREATE TABLE companies (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    FOUNDEDDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT COMPS_PK PRIMARY KEY (ID)
);

CREATE TABLE departments (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    EMP_OF_THE_MONTH INTEGER,
    COMPANYID INTEGER REFERENCES companies,
    CONSTRAINT DEPTS_PK PRIMARY KEY (ID)
);

CREATE TABLE persons (
    PERSONID INTEGER NOT NULL,
    FIRSTNAME VARCHAR(32) NOT NULL,
    LASTNAME VARCHAR(32) NOT NULL,
    MIDDLENAME VARCHAR(32),
    BIRTHDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT PERS_PK PRIMARY KEY (PERSONID)
);

CREATE TABLE employees (
    PERSONID INTEGER NOT NULL,
    HIREDATE VARCHAR(32),
    WEEKLYHOURS FLOAT,
    DEPARTMENT INTEGER REFERENCES departments,
    FUNDINGDEPT INTEGER REFERENCES departments,
    MANAGER INTEGER REFERENCES persons,
    MENTOR INTEGER REFERENCES persons,
    HRADVISOR INTEGER REFERENCES persons,
    WAGE FLOAT,
    SALARY FLOAT,
    DISCRIMINATOR varchar(64) NOT NULL,
    CONSTRAINT EMPS_PK PRIMARY KEY (PERSONID),
    CONSTRAINT EMPS_FK FOREIGN KEY (PERSONID) REFERENCES persons (PERSONID)
);

CREATE TABLE insuranceplans (
    INSID INTEGER NOT NULL,
    CARRIER VARCHAR(64) NOT NULL,
    EMPLOYEE INTEGER REFERENCES persons,
    PLANTYPE VARCHAR(8),
    LIFETIME_ORTHO_BENEFIT DECIMAL(22,3),
    DISCRIMINATOR varchar(64) NOT NULL,
    CONSTRAINT INS_PK PRIMARY KEY (INSID)
);

CREATE TABLE projects (
    PROJID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    BUDGET DECIMAL(11,2) NOT NULL,
    CONSTRAINT PROJS_PK PRIMARY KEY (PROJID)
);

CREATE TABLE project_reviewer (
    PROJID INTEGER NOT NULL,
    REVIEWER INTEGER NOT NULL
);

CREATE TABLE project_member (
    PROJID INTEGER REFERENCES projects NOT NULL,
    MEMBER INTEGER REFERENCES persons NOT NULL
);

CREATE TABLE employee_phoneno_type (
    EMPID INTEGER REFERENCES persons NOT NULL,
    PHONENO VARCHAR(16) NOT NULL,
    TYPE VARCHAR(16) NOT NULL
);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_PROJ_FK FOREIGN KEY

        (PROJID) REFERENCES projects(PROJID);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_REV_FK FOREIGN KEY

        (REVIEWER) REFERENCES persons(PERSONID);


ALTER TABLE departments 
    ADD CONSTRAINT EMP_MO_FK FOREIGN KEY

        (EMP_OF_THE_MONTH) REFERENCES persons(PERSONID);

disconnect;


------------------------------------------------------------------------

-- SchemaType: application identity


-- Inheritance mapping: 
-- Separate table for each class in the inheritance hierarchy.

-- No tables for abstract classes.
-- Each table contains columns for all fields.

-- Managers, mentors, hradvisors, and employees of the month 
-- are fulltime employees.

-- Only fulltime employees can have insurances, can be project members,
-- and can be project reviewers.
-- Separate phone number type tables for persons, fulltime employees,
-- and parttime employees.

-- See tables "persons", "parttimeemployees", 
-- "fulltimeemployees", "medicalinsurance", "dentalinsurance",

-- "fulltime_employee_phoneno_type", and "parttime_employee_phoneno_type".

connect 'jdbc:derby:jdotckdb;create=true' user 'tckuser' password 'tckuser';

CREATE SCHEMA applicationidentity2;
SET SCHEMA applicationidentity2;

-------------------------
-- company
-------------------------

ALTER TABLE departments DROP CONSTRAINT EMP_MO_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_PROJ_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_REV_FK;
DROP TABLE dentalinsurance;
DROP TABLE medicalinsurance;
DROP TABLE project_reviewer;
DROP TABLE project_member;
DROP TABLE employee_phoneno_type;
DROP TABLE fulltime_employee_phoneno_type;
DROP TABLE parttime_employee_phoneno_type;
DROP TABLE parttimeemployees;
DROP TABLE fulltimeemployees;
DROP TABLE persons;
DROP TABLE projects;
DROP TABLE departments;
DROP TABLE companies;

CREATE TABLE companies (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    FOUNDEDDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT COMPS_PK PRIMARY KEY (ID)
);

CREATE TABLE departments (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    EMP_OF_THE_MONTH INTEGER,
    COMPANYID INTEGER REFERENCES companies,
    CONSTRAINT DEPTS_PK PRIMARY KEY (ID)
);

CREATE TABLE persons (
    PERSONID INTEGER NOT NULL,
    FIRSTNAME VARCHAR(32) NOT NULL,
    LASTNAME VARCHAR(32) NOT NULL,
    MIDDLENAME VARCHAR(32),
    BIRTHDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT PERS_PK PRIMARY KEY (PERSONID)
);

CREATE TABLE fulltimeemployees (
    PERSONID INTEGER NOT NULL,
    FIRSTNAME VARCHAR(32) NOT NULL,
    LASTNAME VARCHAR(32) NOT NULL,
    MIDDLENAME VARCHAR(32),
    BIRTHDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    HIREDATE VARCHAR(32),
    WEEKLYHOURS FLOAT,
    DEPARTMENT INTEGER REFERENCES departments,
    FUNDINGDEPT INTEGER REFERENCES departments,
    MANAGER INTEGER REFERENCES fulltimeemployees,
    MENTOR INTEGER REFERENCES fulltimeemployees,
    HRADVISOR INTEGER REFERENCES fulltimeemployees,
    SALARY FLOAT,
    CONSTRAINT FTEMPS_PK PRIMARY KEY (PERSONID)
);

CREATE TABLE parttimeemployees (
    PERSONID INTEGER NOT NULL,
    FIRSTNAME VARCHAR(32) NOT NULL,
    LASTNAME VARCHAR(32) NOT NULL,
    MIDDLENAME VARCHAR(32),
    BIRTHDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    HIREDATE VARCHAR(32),
    WEEKLYHOURS FLOAT,
    DEPARTMENT INTEGER REFERENCES departments,
    FUNDINGDEPT INTEGER REFERENCES departments,
    MANAGER INTEGER REFERENCES fulltimeemployees,
    MENTOR INTEGER REFERENCES fulltimeemployees,
    HRADVISOR INTEGER REFERENCES fulltimeemployees,
    WAGE FLOAT,
    CONSTRAINT PTEMPS_PK PRIMARY KEY (PERSONID)
);

CREATE TABLE medicalinsurance (
    INSID INTEGER NOT NULL,
    CARRIER VARCHAR(64) NOT NULL,
    EMPLOYEE INTEGER REFERENCES fulltimeemployees,
    PLANTYPE VARCHAR(8),
    CONSTRAINT MEDINS_PK PRIMARY KEY (INSID)
);

CREATE TABLE dentalinsurance (
    INSID INTEGER NOT NULL,
    CARRIER VARCHAR(64) NOT NULL,
    EMPLOYEE INTEGER REFERENCES fulltimeemployees,
    LIFETIME_ORTHO_BENEFIT DECIMAL(22,3),
    CONSTRAINT DENTINS_PK PRIMARY KEY (INSID)
);

CREATE TABLE projects (
    PROJID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    BUDGET DECIMAL(11,2) NOT NULL,
    CONSTRAINT PROJS_PK PRIMARY KEY (PROJID)
);

CREATE TABLE project_reviewer (
    PROJID INTEGER NOT NULL,
    REVIEWER INTEGER NOT NULL
);

CREATE TABLE project_member (
    PROJID INTEGER REFERENCES projects NOT NULL,
    MEMBER INTEGER REFERENCES fulltimeemployees NOT NULL
);

CREATE TABLE employee_phoneno_type (
    EMPID INTEGER REFERENCES persons NOT NULL,
    PHONENO VARCHAR(16) NOT NULL,
    TYPE VARCHAR(16) NOT NULL
);

CREATE TABLE fulltime_employee_phoneno_type (
    EMPID INTEGER REFERENCES fulltimeemployees NOT NULL,
    PHONENO VARCHAR(16) NOT NULL,
    TYPE VARCHAR(16) NOT NULL
);

CREATE TABLE parttime_employee_phoneno_type (
    EMPID INTEGER REFERENCES parttimeemployees NOT NULL,
    PHONENO VARCHAR(16) NOT NULL,
    TYPE VARCHAR(16) NOT NULL
);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_PROJ_FK FOREIGN KEY

        (PROJID) REFERENCES projects(PROJID);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_REV_FK FOREIGN KEY

        (REVIEWER) REFERENCES fulltimeemployees(PERSONID);


ALTER TABLE departments 
    ADD CONSTRAINT EMP_MO_FK FOREIGN KEY

        (EMP_OF_THE_MONTH) REFERENCES fulltimeemployees(PERSONID);

disconnect;


------------------------------------------------------------------------

-- SchemaType: application identity


-- Inheritance mapping: 
-- Person has inheritance strategy "new-table".

-- Employee has inheritance strategy "subclass-table".
-- PartTimeEmployee and FullTimeEmployee have inheritance strategy "new-table".
-- Insurance has inheritance strategy "subclass-table".
-- MedicalInsurance and DentalInsurance have inheritance strategy "new-table".
-- See tables "persons", "parttimeemployees", "fulltimeemployees",
-- "medicalinsurance" and "dentalinsurance".

connect 'jdbc:derby:jdotckdb;create=true' user 'tckuser' password 'tckuser';

CREATE SCHEMA applicationidentity3;
SET SCHEMA applicationidentity3;

-------------------------
-- company
-------------------------

ALTER TABLE departments DROP CONSTRAINT EMP_MO_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_PROJ_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_REV_FK;
DROP TABLE dentalinsurance;
DROP TABLE medicalinsurance;
DROP TABLE project_reviewer;
DROP TABLE project_member;
DROP TABLE employee_phoneno_type;
DROP TABLE fulltimeemployees;
DROP TABLE parttimeemployees;
DROP TABLE persons;
DROP TABLE projects;
DROP TABLE departments;
DROP TABLE companies;

CREATE TABLE companies (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    FOUNDEDDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT COMPS_PK PRIMARY KEY (ID)
);

CREATE TABLE departments (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    EMP_OF_THE_MONTH INTEGER,
    COMPANYID INTEGER REFERENCES companies,
    CONSTRAINT DEPTS_PK PRIMARY KEY (ID)
);

CREATE TABLE persons (
    PERSONID INTEGER NOT NULL,
    FIRSTNAME VARCHAR(32) NOT NULL,
    LASTNAME VARCHAR(32) NOT NULL,
    MIDDLENAME VARCHAR(32),
    BIRTHDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT PERS_PK PRIMARY KEY (PERSONID)
);

CREATE TABLE parttimeemployees (
    PERSONID INTEGER NOT NULL,
    HIREDATE VARCHAR(32),
    WEEKLYHOURS FLOAT,
    DEPARTMENT INTEGER REFERENCES departments,
    FUNDINGDEPT INTEGER REFERENCES departments,
    MANAGER INTEGER REFERENCES persons,
    MENTOR INTEGER REFERENCES persons,
    HRADVISOR INTEGER REFERENCES persons,
    WAGE FLOAT,
    CONSTRAINT PTEMPS_PK PRIMARY KEY (PERSONID),
    CONSTRAINT PTEMPS_FK FOREIGN KEY (PERSONID) REFERENCES persons (PERSONID)
);

CREATE TABLE fulltimeemployees (
    PERSONID INTEGER NOT NULL,
    HIREDATE VARCHAR(32),
    WEEKLYHOURS FLOAT,
    DEPARTMENT INTEGER REFERENCES departments,
    FUNDINGDEPT INTEGER REFERENCES departments,
    MANAGER INTEGER REFERENCES persons,
    MENTOR INTEGER REFERENCES persons,
    HRADVISOR INTEGER REFERENCES persons,
    SALARY FLOAT,
    CONSTRAINT FTEMPS_PK PRIMARY KEY (PERSONID),
    CONSTRAINT FTEMPS_FK FOREIGN KEY (PERSONID) REFERENCES persons (PERSONID)
);

CREATE TABLE medicalinsurance (
    INSID INTEGER NOT NULL,
    CARRIER VARCHAR(64) NOT NULL,
    EMPLOYEE INTEGER REFERENCES persons,
    PLANTYPE VARCHAR(8),
    CONSTRAINT MEDINS_PK PRIMARY KEY (INSID)
);

CREATE TABLE dentalinsurance (
    INSID INTEGER NOT NULL,
    CARRIER VARCHAR(64) NOT NULL,
    EMPLOYEE INTEGER REFERENCES persons,
    LIFETIME_ORTHO_BENEFIT DECIMAL(22,3),
    CONSTRAINT DENTINS_PK PRIMARY KEY (INSID)
);

CREATE TABLE projects (
    PROJID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    BUDGET DECIMAL(11,2) NOT NULL,
    CONSTRAINT PROJS_PK PRIMARY KEY (PROJID)
);

CREATE TABLE project_reviewer (
    PROJID INTEGER NOT NULL,
    REVIEWER INTEGER NOT NULL
);

CREATE TABLE project_member (
    PROJID INTEGER REFERENCES projects NOT NULL,
    MEMBER INTEGER REFERENCES persons NOT NULL
);

CREATE TABLE employee_phoneno_type (
    EMPID INTEGER REFERENCES persons NOT NULL,
    PHONENO VARCHAR(16) NOT NULL,
    TYPE VARCHAR(16) NOT NULL
);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_PROJ_FK FOREIGN KEY

        (PROJID) REFERENCES projects(PROJID);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_REV_FK FOREIGN KEY

        (REVIEWER) REFERENCES persons(PERSONID);


ALTER TABLE departments 
    ADD CONSTRAINT EMP_MO_FK FOREIGN KEY

        (EMP_OF_THE_MONTH) REFERENCES persons(PERSONID);

disconnect;


------------------------------------------------------------------------

-- SchemaType: application identity


-- Inheritance mapping: 
-- Separate table for each class in the inheritance hierarchy.

-- Each table contains columns for the declared fields.

-- See tables "persons", "employees", "parttimeemployees", 
-- "fulltimeemployees", "insuranceplans", "medicalinsurance", and "dentalinsurance".


connect 'jdbc:derby:jdotckdb;create=true' user 'tckuser' password 'tckuser';

CREATE SCHEMA applicationidentity1;
SET SCHEMA applicationidentity1;

-------------------------
-- company
-------------------------

ALTER TABLE departments DROP CONSTRAINT EMP_MO_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_PROJ_FK;
ALTER TABLE project_reviewer DROP CONSTRAINT PR_REV_FK;
DROP TABLE dentalinsurance;
DROP TABLE medicalinsurance;
DROP TABLE insuranceplans;
DROP TABLE project_reviewer;
DROP TABLE project_member;
DROP TABLE employee_phoneno_type;
DROP TABLE fulltimeemployees;
DROP TABLE parttimeemployees;
DROP TABLE employees;
DROP TABLE persons;
DROP TABLE projects;
DROP TABLE departments;
DROP TABLE companies;

CREATE TABLE companies (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    FOUNDEDDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT COMPS_PK PRIMARY KEY (ID)
);

CREATE TABLE departments (
    ID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    EMP_OF_THE_MONTH INTEGER,
    COMPANYID INTEGER REFERENCES companies,
    CONSTRAINT DEPTS_PK PRIMARY KEY (ID)
);

CREATE TABLE persons (
    PERSONID INTEGER NOT NULL,
    FIRSTNAME VARCHAR(32) NOT NULL,
    LASTNAME VARCHAR(32) NOT NULL,
    MIDDLENAME VARCHAR(32),
    BIRTHDATE VARCHAR(32) NOT NULL,
    ADDRID INTEGER,
    STREET VARCHAR(64),
    CITY VARCHAR(64),
    STATE CHAR(2),
    ZIPCODE CHAR(5),
    COUNTRY VARCHAR(64),
    CONSTRAINT PERS_PK PRIMARY KEY (PERSONID)
);

CREATE TABLE employees (
    PERSONID INTEGER NOT NULL,
    HIREDATE VARCHAR(32),
    WEEKLYHOURS FLOAT,
    DEPARTMENT INTEGER REFERENCES departments,
    FUNDINGDEPT INTEGER REFERENCES departments,
    MANAGER INTEGER REFERENCES persons,
    MENTOR INTEGER REFERENCES persons,
    HRADVISOR INTEGER REFERENCES persons,
    CONSTRAINT EMPS_PK PRIMARY KEY (PERSONID),
    CONSTRAINT EMPS_FK FOREIGN KEY (PERSONID) REFERENCES persons (PERSONID)
);

CREATE TABLE parttimeemployees (
    PERSONID INTEGER NOT NULL,
    WAGE FLOAT,
    CONSTRAINT PTEMPS_PK PRIMARY KEY (PERSONID),
    CONSTRAINT PTEMPS_FK FOREIGN KEY (PERSONID) REFERENCES persons (PERSONID)
);

CREATE TABLE fulltimeemployees (
    PERSONID INTEGER NOT NULL,
    SALARY FLOAT,
    CONSTRAINT FTEMPS_PK PRIMARY KEY (PERSONID),
    CONSTRAINT FTEMPS_FK FOREIGN KEY (PERSONID) REFERENCES persons (PERSONID)
);

CREATE TABLE insuranceplans (
    INSID INTEGER NOT NULL,
    CARRIER VARCHAR(64) NOT NULL,
    EMPLOYEE INTEGER REFERENCES persons,
    CONSTRAINT INS_PK PRIMARY KEY (INSID)
);

CREATE TABLE medicalinsurance (
    INSID INTEGER NOT NULL,
    PLANTYPE VARCHAR(8),
    CONSTRAINT MEDINS_PK PRIMARY KEY (INSID),
    CONSTRAINT MEDINS_FK FOREIGN KEY (INSID) REFERENCES insuranceplans (INSID)
);

CREATE TABLE dentalinsurance (
    INSID INTEGER NOT NULL,
    LIFETIME_ORTHO_BENEFIT DECIMAL(22,3),
    CONSTRAINT DENTINS_PK PRIMARY KEY (INSID),
    CONSTRAINT DENTINS_FK FOREIGN KEY (INSID) REFERENCES insuranceplans (INSID)
);

CREATE TABLE projects (
    PROJID INTEGER NOT NULL,
    NAME VARCHAR(32) NOT NULL,
    BUDGET DECIMAL(11,2) NOT NULL,
    CONSTRAINT PROJS_PK PRIMARY KEY (PROJID)
);

CREATE TABLE project_reviewer (
    PROJID INTEGER NOT NULL,
    REVIEWER INTEGER NOT NULL
);

CREATE TABLE project_member (
    PROJID INTEGER REFERENCES projects NOT NULL,
    MEMBER INTEGER REFERENCES persons NOT NULL
);

CREATE TABLE employee_phoneno_type (
    EMPID INTEGER REFERENCES persons NOT NULL,
    PHONENO VARCHAR(16) NOT NULL,
    TYPE VARCHAR(16) NOT NULL
);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_PROJ_FK FOREIGN KEY

        (PROJID) REFERENCES projects(PROJID);


ALTER TABLE project_reviewer 
    ADD CONSTRAINT PR_REV_FK FOREIGN KEY

        (REVIEWER) REFERENCES persons(PERSONID);


ALTER TABLE departments 
    ADD CONSTRAINT EMP_MO_FK FOREIGN KEY

        (EMP_OF_THE_MONTH) REFERENCES persons(PERSONID);

disconnect;



--
Michael Bouschen                [EMAIL PROTECTED] Engineering GmbH
mailto:[EMAIL PROTECTED]        http://www.tech.spree.de/
Tel.:++49/30/235 520-33         Buelowstr. 66                   
Fax.:++49/30/2175 2012          D-10783 Berlin                  






















					Reply via email to