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• Rashik Ishrak • Raiyan Ferdous• AL-amin Hossain (123 1173 642)

Table schemaCREATE TABLE Employees( Employee_ID NUMBER(6) NOT NULL, First_Name VARCHAR2(20), Last_Name VARCHAR2(25) NOT NULL, Email VARCHAR2(25) NOT NULL, Phone_Number VARCHAR2(25), Hire_Date DATE NOT NULL, Job_ID VARCHAR2(10) NOT NULL, Salary NUMBER(8,2), Commission_PCT NUMBER(2,2), Manager_ID NUMBER(6), Department_ID NUMBER(4));

CREATE TABLE Locations(Location_ID NUMBER(4) NOT NULL,Street_Address VARCHAR2(40),Postal_Code VARCHAR2(12),City VARCHAR2(30) NOT NULL,State_Province VARCHAR2(25),Country_ID CHAR(2));

Employees Table

Locations Table

Update Existing Data

UPDATE EmployeesSET First_name='Toni'WHERE First_name='Steven';

Average, Minimum, Maximum, Summation

AVG, MIN, MAX, SUM

Select AVG(Salary),MAX(Salary),MIN(Salary),SUM(Salary)From Employees;

Average, Minimum, Maximum, Summation

Select MAX(Hire_date),MIN(Hire_date)From Employees;

Adding & Modifying Column

Locations Table:

ALTER TABLE locationsADD (House_Number VARCHAR2(3));

Adding & Modifying ColumnIn the last query, new column can take only three character.

ALTER TABLE locationsADD (House_Number VARCHAR2(3));

We can’t insert House number with 4 character. We need to Modify the column. Let, House No = 1213

ALTER TABLE locationsMODIFY (House_Number VARCHAR2(4));

Adding & Modifying