SQL Table
Structured Query Language (SQL) is the backbone of database management systems, and one of its key components is the SQL table.
A SQL Table is a two-dimensional data structure that organizes information into rows and columns. Each row represents a record, while each column signifies a specific attribute or field. This tabular format enables users to store and manage vast amounts of data in a logical and easily retrievable way.
In the below PDF we discuss about SQL Table in detail in simple language, Hope this will help in better understanding.
SQL Table Operations:
1. Creating a Table: Creating a table in SQL involves defining its structure, including the columns and their data types. Let’s consider an example of creating a simple table to store information about employees:
CREATE TABLE Employees (
EmployeeID INT PRIMARY KEY,
FirstName VARCHAR(50),
LastName VARCHAR(50),
Department VARCHAR(50),
Salary DECIMAL(10,2)
);
In this example, we create a table named “Employees” with columns for EmployeeID, FirstName, LastName, Department, and Salary. The data types (INT, VARCHAR, DECIMAL) define the kind of data each column can hold.
2. Inserting Data: Once a table is created, data can be inserted using the INSERT INTO statement:
INSERT INTO Employees (EmployeeID, FirstName, LastName, Department, Salary)
VALUES (1, 'John', 'Doe', 'IT', 60000.00);
This adds a new record to the Employees table with the specified values for each column.
3. Querying Data:
SQL’s SELECT statement is used to retrieve data from a table. For instance, to fetch all employees from the IT department:
SELECT * FROM Employees WHERE Department = 'IT';
This query returns all columns for records where the Department is 'IT'.
4. Updating and Deleting Data:
SQL provides UPDATE and DELETE statements for modifying existing records. For example, to increase John Doe’s salary:
UPDATE Employees SET Salary = 65000.00 WHERE EmployeeID = 1;
To remove an employee from the table:
DELETE FROM Employees WHERE EmployeeID = 1;
These statements enable users to maintain the accuracy and relevance of data within a table.
Related Question
An SQL table is a structured collection of data organized in rows and columns. It represents a two-dimensional structure where each row corresponds to a record, and each column represents a specific attribute or field.
To create a table in SQL, you use the CREATE TABLE statement.
A primary key is a column or a set of columns in a table that uniquely identifies each record in that table. It ensures the uniqueness of the data and is used to establish relationships between tables.
To retrieve all records from an SQL table, you use the SELECT statement without any specific conditions.
To delete a table in SQL, you use the DROP TABLE statement.
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