Example of SQL-Query based Approach (Part 2: Data): RDB (relational) Data and corresponding (virtual) RDF Graphs

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Sample data for the relational schema:

DEPT table

deptno dname loc
10 APPSERVER NEW YORK
20 RESEARCH TEXAS
30 SALES ILLINOIS
40 OPERATIONS CALIFORNIA
50 DBSERVER MASSACHUSETTS

EMP table

empno ename job deptno etype
7369 SMITH CLERK 10 PART_TIME
7499 ALLEN SALES 30 FULL_TIME
7521 RAMIREZ SALES 20 FULL_TIME
7566 JONES MANAGER 20 FULL_TIME
7654 MARTIN ENGINEER 50 PART_TIME
7698 PATEL SALES 50 PART_TIME
7782 CLARK MANAGER 30 FULL_TIME
7788 SCOTT ANALYST 20 FULL_TIME
7839 KING PRESIDENT 40 FULL_TIME
7844 TURNER ENGINEER 50 INTERN
7876 ADAMS CLERK 30 INTERN
7900 CHANG ENGINEER 10 FULL_TIME
7902 FORD ANALYST 10 PART_TIME
7934 MILLER CLERK 40 FULL_TIME

Results for queries used in SQLdefStrings of the Mapping Specification:

SQLDefString: DEPT

 Select 
   '<xyz.com/dept/' || deptno || '>' AS deptURI
 , deptno
 , dname
 , loc 
 from dept
deptURI deptno dname loc
<xyz.com/dept/10> 10 APPSERVER NEW YORK
<xyz.com/dept/20> 20 RESEARCH TEXAS
<xyz.com/dept/30> 30 SALES ILLINOIS
<xyz.com/dept/40> 40 OPERATIONS CALIFORNIA
<xyz.com/dept/50> 50 DBSERVER MASSACHUSETTS

SQLDefString: EMP

 Select 
   '<xyz.com/emp/' || empno || '>' AS empURI
 , empno
 , ename
 , '<xyz.com/emp/job/'|| job || '>' AS jobTypeURI
 , job
 , deptno
 , '<xyz.com/emp/etype/'|| etype || '>' AS empTypeURI
 , etype
 , '<xyz.com/graph/'|| job || '/' || etype || '>' AS graphURI 
 from emp
empURI empno ename jobTypeURI job deptno empTypeURI etype graphURI
<xyz.com/emp/7369> 7369 SMITH <xyz.com/emp/job/CLERK> CLERK 10 <xyz.com/emp/etype/PART_TIME> PART_TIME <xyz.com/graph/CLERK/PART_TIME>
<xyz.com/emp/7499> 7499 ALLEN <xyz.com/emp/job/SALES> SALES 30 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/SALES/FULL_TIME>
<xyz.com/emp/7521> 7521 RAMIREZ <xyz.com/emp/job/SALES> SALES 20 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/SALES/FULL_TIME>
<xyz.com/emp/7566> 7566 JONES <xyz.com/emp/job/MANAGER> MANAGER 20 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/MANAGER/FULL_TIME>
<xyz.com/emp/7654> 7654 MARTIN <xyz.com/emp/job/ENGINEER> ENGINEER 50 <xyz.com/emp/etype/PART_TIME> PART_TIME <xyz.com/graph/ENGINEER/PART_TIME>
<xyz.com/emp/7698> 7698 PATEL <xyz.com/emp/job/SALES> SALES 50 <xyz.com/emp/etype/PART_TIME> PART_TIME <xyz.com/graph/SALES/PART_TIME>
<xyz.com/emp/7782> 7782 CLARK <xyz.com/emp/job/MANAGER> MANAGER 30 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/MANAGER/FULL_TIME>
<xyz.com/emp/7788> 7788 SCOTT <xyz.com/emp/job/ANALYST> ANALYST 20 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/ANALYST/FULL_TIME>
<xyz.com/emp/7839> 7839 KING <xyz.com/emp/job/PRESIDENT> PRESIDENT 40 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/PRESIDENT/FULL_TIME>
<xyz.com/emp/7844> 7844 TURNER <xyz.com/emp/job/ENGINEER> ENGINEER 50 <xyz.com/emp/etype/INTERN> INTERN <xyz.com/graph/ENGINEER/INTERN>
<xyz.com/emp/7876> 7876 ADAMS <xyz.com/emp/job/CLERK> CLERK 30 <xyz.com/emp/etype/INTERN> INTERN <xyz.com/graph/CLERK/INTERN>
<xyz.com/emp/7900> 7900 CHANG <xyz.com/emp/job/ENGINEER> ENGINEER 10 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/ENGINEER/FULL_TIME>
<xyz.com/emp/7902> 7902 FORD <xyz.com/emp/job/ANALYST> ANALYST 10 <xyz.com/emp/etype/PART_TIME> PART_TIME <xyz.com/graph/ANALYST/PART_TIME>
<xyz.com/emp/7934> 7934 MILLER <xyz.com/emp/job/CLERK> CLERK 40 <xyz.com/emp/etype/FULL_TIME> FULL_TIME <xyz.com/graph/CLERK/FULL_TIME>


(Virtual) RDF Graphs (conceptually generated) based upon above relational data

Graph: xyz.com/graph/CLERK/PART_TIME

 <xyz.com/emp/7369>    rdf:type          xyz:emp
 <xyz.com/emp/7369>    emp:empno         "7369"^^xsd:integer
 <xyz.com/emp/7369>    emp:Name          "SMITH"
 <xyz.com/emp/7369>    emp:jobtype       <xyz.com/emp/job/CLERK>
 <xyz.com/emp/7369>    emp:job           "CLERK"
 <xyz.com/emp/7369>    emp:deptNum       "10"^^xsd:integer
 <xyz.com/emp/7369>    emp:emptype       <xyz.com/emp/etype/PART_TIME>
 <xyz.com/emp/7369>    emp:etype         "PART_TIME"

Graph: xyz.com/graph/SALES/FULL_TIME

 <xyz.com/emp/7499>    rdf:type          xyz:emp
 <xyz.com/emp/7499>    emp:empno         "7499"^^xsd:integer
 <xyz.com/emp/7499>    emp:Name          "ALLEN"
 <xyz.com/emp/7499>    emp:jobtype       <xyz.com/emp/job/SALES>
 <xyz.com/emp/7499>    emp:job           "SALES"
 <xyz.com/emp/7499>    emp:deptNum       "30"^^xsd:integer
 <xyz.com/emp/7499>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7499>    emp:etype         "FULL_TIME"
 <xyz.com/emp/7521>    rdf:type          xyz:emp
 <xyz.com/emp/7521>    emp:empno         "7521"^^xsd:integer
 <xyz.com/emp/7521>    emp:Name          "RAMIREZ"
 <xyz.com/emp/7521>    emp:jobtype       <xyz.com/emp/job/SALES>
 <xyz.com/emp/7521>    emp:job           "SALES"
 <xyz.com/emp/7521>    emp:deptNum       "20"^^xsd:integer
 <xyz.com/emp/7521>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7521>    emp:etype         "FULL_TIME"

Graph: xyz.com/graph/MANAGER/FULL_TIME

 <xyz.com/emp/7566>    rdf:type          xyz:emp
 <xyz.com/emp/7566>    emp:empno         "7566"^^xsd:integer
 <xyz.com/emp/7566>    emp:Name          "JONES"
 <xyz.com/emp/7566>    emp:jobtype       <xyz.com/emp/job/MANAGER>
 <xyz.com/emp/7566>    emp:job           "MANAGER"
 <xyz.com/emp/7566>    emp:deptNum       "20"^^xsd:integer
 <xyz.com/emp/7566>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7566>    emp:etype         "FULL_TIME"
 <xyz.com/emp/7782>    rdf:type          xyz:emp
 <xyz.com/emp/7782>    emp:empno         "7782"^^xsd:integer
 <xyz.com/emp/7782>    emp:Name          "CLARK"
 <xyz.com/emp/7782>    emp:jobtype       <xyz.com/emp/job/MANAGER>
 <xyz.com/emp/7782>    emp:job           "MANAGER"
 <xyz.com/emp/7782>    emp:deptNum       "30"^^xsd:integer
 <xyz.com/emp/7782>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7782>    emp:etype         "FULL_TIME"

Graph: xyz.com/graph/ENGINEER/PART_TIME

 <xyz.com/emp/7654>    rdf:type          xyz:emp
 <xyz.com/emp/7654>    emp:empno         "7654"^^xsd:integer
 <xyz.com/emp/7654>    emp:Name          "MARTIN"
 <xyz.com/emp/7654>    emp:jobtype       <xyz.com/emp/job/ENGINEER>
 <xyz.com/emp/7654>    emp:job           "ENGINEER"
 <xyz.com/emp/7654>    emp:deptNum       "50"^^xsd:integer
 <xyz.com/emp/7654>    emp:emptype       <xyz.com/emp/etype/PART_TIME>
 <xyz.com/emp/7654>    emp:etype         "PART_TIME"

Graph: xyz.com/graph/SALES/PART_TIME

 <xyz.com/emp/7698>    rdf:type          xyz:emp
 <xyz.com/emp/7698>    emp:empno         "7698"^^xsd:integer
 <xyz.com/emp/7698>    emp:Name          "PATEL"
 <xyz.com/emp/7698>    emp:jobtype       <xyz.com/emp/job/SALES>
 <xyz.com/emp/7698>    emp:job           "SALES"
 <xyz.com/emp/7698>    emp:deptNum       "50"^^xsd:integer
 <xyz.com/emp/7698>    emp:emptype       <xyz.com/emp/etype/PART_TIME>
 <xyz.com/emp/7698>    emp:etype         "PART_TIME"

Graph: xyz.com/graph/ANALYST/FULL_TIME

 <xyz.com/emp/7788>    rdf:type          xyz:emp
 <xyz.com/emp/7788>    emp:empno         "7788"^^xsd:integer
 <xyz.com/emp/7788>    emp:Name          "SCOTT"
 <xyz.com/emp/7788>    emp:jobtype       <xyz.com/emp/job/ANALYST>
 <xyz.com/emp/7788>    emp:job           "ANALYST"
 <xyz.com/emp/7788>    emp:deptNum       "20"^^xsd:integer
 <xyz.com/emp/7788>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7788>    emp:etype         "FULL_TIME"

Graph: xyz.com/graph/PRESIDENT/FULL_TIME

 <xyz.com/emp/7839>    rdf:type          xyz:emp
 <xyz.com/emp/7839>    emp:empno         "7839"^^xsd:integer
 <xyz.com/emp/7839>    emp:Name          "KING"
 <xyz.com/emp/7839>    emp:jobtype       <xyz.com/emp/job/PRESIDENT>
 <xyz.com/emp/7839>    emp:job           "PRESIDENT"
 <xyz.com/emp/7839>    emp:deptNum       "40"^^xsd:integer
 <xyz.com/emp/7839>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7839>    emp:etype         "FULL_TIME"

Graph: xyz.com/graph/ENGINEER/INTERN

 <xyz.com/emp/7844>    rdf:type          xyz:emp
 <xyz.com/emp/7844>    emp:empno         "7844"^^xsd:integer
 <xyz.com/emp/7844>    emp:Name          "TURNER"
 <xyz.com/emp/7844>    emp:jobtype       <xyz.com/emp/job/ENGINEER>
 <xyz.com/emp/7844>    emp:job           "ENGINEER"
 <xyz.com/emp/7844>    emp:deptNum       "50"^^xsd:integer
 <xyz.com/emp/7844>    emp:emptype       <xyz.com/emp/etype/INTERN>
 <xyz.com/emp/7844>    emp:etype         "INTERN"

Graph: xyz.com/graph/CLERK/INTERN

 <xyz.com/emp/7876>    rdf:type          xyz:emp
 <xyz.com/emp/7876>    emp:empno         "7876"^^xsd:integer
 <xyz.com/emp/7876>    emp:Name          "ADAMS"
 <xyz.com/emp/7876>    emp:jobtype       <xyz.com/emp/job/CLERK>
 <xyz.com/emp/7876>    emp:job           "CLERK"
 <xyz.com/emp/7876>    emp:deptNum       "30"^^xsd:integer
 <xyz.com/emp/7876>    emp:emptype       <xyz.com/emp/etype/INTERN>
 <xyz.com/emp/7876>    emp:etype         "INTERN"

Graph: xyz.com/graph/ENGINEER/FULL_TIME

 <xyz.com/emp/7900>    rdf:type          xyz:emp
 <xyz.com/emp/7900>    emp:empno         "7900"^^xsd:integer
 <xyz.com/emp/7900>    emp:Name          "CHANG"
 <xyz.com/emp/7900>    emp:jobtype       <xyz.com/emp/job/ENGINEER>
 <xyz.com/emp/7900>    emp:job           "ENGINEER"
 <xyz.com/emp/7900>    emp:deptNum       "10"^^xsd:integer
 <xyz.com/emp/7900>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7900>    emp:etype         "FULL_TIME"

Graph: xyz.com/graph/ANALYST/PART_TIME

 <xyz.com/emp/7902>    rdf:type          xyz:emp
 <xyz.com/emp/7902>    emp:empno         "7902"^^xsd:integer
 <xyz.com/emp/7902>    emp:Name          "FORD"
 <xyz.com/emp/7902>    emp:jobtype       <xyz.com/emp/job/ANALYST>
 <xyz.com/emp/7902>    emp:job           "ANALYST"
 <xyz.com/emp/7902>    emp:deptNum       "10"^^xsd:integer
 <xyz.com/emp/7902>    emp:emptype       <xyz.com/emp/etype/PART_TIME>
 <xyz.com/emp/7902>    emp:etype         "PART_TIME"

Graph: xyz.com/graph/CLERK/FULL_TIME

 <xyz.com/emp/7934>    rdf:type          xyz:emp
 <xyz.com/emp/7934>    emp:empno         "7934"^^xsd:integer
 <xyz.com/emp/7934>    emp:Name          "MILLER"
 <xyz.com/emp/7934>    emp:jobtype       <xyz.com/emp/job/CLERK>
 <xyz.com/emp/7934>    emp:job           "CLERK"
 <xyz.com/emp/7934>    emp:deptNum       "40"^^xsd:integer
 <xyz.com/emp/7934>    emp:emptype       <xyz.com/emp/etype/FULL_TIME>
 <xyz.com/emp/7934>    emp:etype         "FULL_TIME"