TABLE

Example

CREATE TABLE Employee (
  ID INT NOT NULL,
  Name VARCHAR(255),
  Age INT,
  Salary FLOAT,
  PRIMARY KEY (ID)
);

Output

Query OK, 0 rows affected (0.01 sec)

Explanation

This SQL statement creates a new table named ‘Employee’. The table includes columns for ID, Name, Age, and Salary. The ID column is designated as the primary key.

Example

CREATE TABLE Employees (
    ID INT PRIMARY KEY     NOT NULL,
    NAME           TEXT    NOT NULL,
    SALARY         REAL    DEFAULT 30000.0,
    JOIN_DATE      DATE    NOT NULL
);

Output

‘CREATE TABLE’ command is successfully executed

Explanation

This SQL statement creates a new table in a database. The table, named ‘Employees’, has four fields: ‘ID’, ‘NAME’, ‘SALARY’, and ‘JOIN_DATE’. The ‘ID’ field is of type INT and is the primary key, the ‘NAME’ field is of type TEXT, the ‘SALARY’ field is of type REAL with a default value of 30000.0, and the ‘JOIN_DATE’ field is of type DATE.

Example

CREATE TABLE Employees (
   ID INT PRIMARY KEY,
   FirstName VARCHAR(50),
   LastName VARCHAR(50),
   Position VARCHAR(50)
 );

INSERT INTO Employees (ID, FirstName, LastName, Position)
VALUES (1, 'John', 'Doe', 'Manager');

Output

Command(s) completed successfully.

Explanation

The above example creates a table called Employees with columns ID, FirstName, LastName, and Position. It then inserts a record into the table, with the ID of 1, first name of ‘John’, last name of ‘Doe’, and position of ‘Manager’.

Example

CREATE TABLE Employees (
    Employee_Id number(10),
    First_Name varchar2(100),
    Last_Name varchar2(100),
    Hire_Date date,
    Phone_Number varchar2(20),
);

Output

Table EMPLOYEES created.

Explanation

The above SQL statement is an example of how to create a new table in Oracle called Employees. The table is composed of five columns, Employee_Id, First_Name, Last_Name, Hire_Date and Phone_Number. Each column has a specific data type and size - number(10) for Employee_Id, varchar2(100) for First_Name and Last_Name, date for Hire_Date and varchar2(20) for Phone_Number.

Example

CREATE TABLE Students (
    ID INTEGER PRIMARY KEY,
    Name TEXT NOT NULL,
    Age INTEGER NOT NULL,
    Grade INTEGER NOT NULL
);

INSERT INTO Students (ID, Name, Age, Grade)
VALUES (1, 'John Doe', 15, 10),
       (2, 'Jane Doe', 16, 11);

SELECT * FROM Students;

Output

ID | Name      | Age | Grade
1  | John Doe  | 15  | 10
2  | Jane Doe  | 16  | 11

Explanation

The CREATE TABLE statement is used to create a new table called Students with four columns: ID, Name, Age, and Grade. ID is assigned as the primary key. The NOT NULL constraint ensures that each of these columns must always have a value.

The INSERT INTO statement is used to insert two new rows of values into the Students table.

Finally, the SELECT * FROM Students statement selects all rows and columns from the Students table, displaying all the data contained within the table.