Two Table Equi-Joins for ids : Equijoins « Table Joins « Oracle PL / SQL

1. Oracle PL / SQL
2. Table Joins
3. Equijoins

Two Table Equi-Joins for ids

   
SQL>
SQL>
SQL>
SQL> CREATE TABLE emp (
  2     empID INT NOT NULL PRIMARY KEY,
  3     Name      VARCHAR(50) NOT NULL);

Table created.

SQL> INSERT INTO emp (empID,Name) VALUES (1,'Tom');

1 row created.

SQL> INSERT INTO emp (empID,Name) VALUES (2,'Jack');

1 row created.

SQL> INSERT INTO emp (empID,Name) VALUES (3,'Mary');

1 row created.

SQL> INSERT INTO emp (empID,Name) VALUES (4,'Bill');

1 row created.

SQL> INSERT INTO emp (empID,Name) VALUES (5,'Cat');

1 row created.

SQL> INSERT INTO emp (empID,Name) VALUES (6,'Victor');

1 row created.

SQL>
SQL>
SQL> CREATE TABLE empExam (
  2     empID  INT NOT NULL,
  3     ExamID     INT NOT NULL,
  4     Mark       INT,
  5     Taken   SMALLINT,
  6     Comments   VARCHAR(255),
  7     CONSTRAINT PK_empExam PRIMARY KEY (empID, ExamID));

Table created.

SQL>
SQL>
SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,Comments) VALUES (1,1,55,1,'Satisfactory');

1 row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,Comments) VALUES (1,2,73,1,'Good result');

1 row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,Comments) VALUES (2,3,44,1,'Hard');

1 row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken,Comments) VALUES (2,5,39,0,'Simple');

1 row created.

SQL> INSERT INTO empExam (empID,ExamID,Mark,Taken) VALUES (2,6,63,1);

1 row created.

SQL>
SQL>
SQL> SELECT empExam.ExamID,
  2         empExam.Mark,
  3         emp.Name AS empName
  4  FROM empExam
  5     JOIN emp
  6     ON empExam.empID = emp.empID
  7  ORDER BY ExamID;

    EXAMID       MARK EMPNAME
---------- ---------- --------------------------------------------------
         1         55 Tom
         2         73 Tom
         3         44 Jack
         5         39 Jack
         6         63 Jack

5 rows selected.

SQL>
SQL>
SQL> drop table empExam;

Table dropped.

SQL> drop table emp;

Table dropped.

SQL>

   
    
    
  

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