After setting up all relations, you need to apply following queries to get data from given relations: (Write queries and also paste screenshots in answer file) Get all the employees work with ‘Martin’ or ‘Scott’ in their departments. Get all employees work under management of ‘Blake’. Sort in descending order with respect to employee number. Get all employees with letter ‘A’ in their name, who work in New York. Get all employees data whom salaries are more than combined salaries of Adams and Smith.
After setting up all relations, you need to apply following queries to get data from given
relations: (Write queries and also paste screenshots in answer file)
Get all the employees work with ‘Martin’ or ‘Scott’ in their departments.
Get all employees work under management of ‘Blake’. Sort in descending order with
respect to employee number.
Get all employees with letter ‘A’ in their name, who work in New York.
Get all employees data whom salaries are more than combined salaries of Adams and
Smith.
Using oracle APEX we are creating a table now -
CREATE TABLE DEPT(
DEPTNO NUMBER(10) NOT NULL,
DNAME VARCHAR(50) NOT NULL,
LOC VARCHAR2(30),
CONSTRAINT DEPT_PK PRIMARY KEY
(DEPTNO)
);
We use NOT NULL constraint to make the cell occupied with something related to column line
for example; we can see a lot of applications where we see (field is mandatory)
NOW EMP TABLE-
CREATE TABLE EMP(
EMPNO NUMBER(10)NOT NULL,
ENAME VARCHAR2(50)NOT NULL,
JOB VARCHAR2(50),
MGR VARCHAR2(50),
HIREDATE DATE,
SAL NUMBER(6),
COMM VARCHAR2(50)
DEPTNO NUMBER(5)NOT NULL,
CONSTRAINT EMP_FK FOREIGN KEY(
DEPTNO) REFERENCES DEPT (DEPTNO), (maintains a connection to EMP table DEPTNO)
CONSTRAINT EMP_PK PRIMARY KEY
(EMPNO)
);
- FOREIGN KEY IS used to establish the connection between any two tables
- PRIMARY KEY is used to uniquely identify records from the table
CREATE TABLE SAL GRADE (
GRADE NUMBER(10) NOT NULL,
LOSAL NUMBER(10),
HISAL NUMBER(10),
CONSTRAINT SALGRADE_PK PRIMARY KEY
(GRADE)
);
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