Sql Then

SQL then

Created By: chatGPT

SQL (Structured Query Language) is a standard programming language used to manage and manipulate databases. Here’s a basic overview of some common SQL operations: retrieving data, inserting data, and updating data.

SELECT * FROM employees;

To retrieve data from a table, you can use the SELECT statement. This retrieves information based on specified columns or conditions.

SELECT first_name, last_name FROM employees WHERE department = 'Sales';

When you want to insert new data into a table, you can use the INSERT INTO statement. This allows you to add new records into your database.

INSERT INTO employees (first_name, last_name, department) VALUES ('John', 'Doe', 'Marketing');

To update existing data, use the UPDATE statement. This modifies records that meet certain conditions.

UPDATE employees SET department = 'HR' WHERE last_name = 'Doe';

To delete data from a table, you use the DELETE statement. Be careful with this command as it removes records without confirming.

DELETE FROM employees WHERE last_name = 'Doe';

You can also create a new table using the CREATE TABLE statement. This defines the structure with specified field types.

CREATE TABLE departments (
    id INT PRIMARY KEY,
    name VARCHAR(100)
);

To drop a table, the DROP TABLE command is utilized. This will permanently remove the table and all of its data.

DROP TABLE departments;

These basic SQL commands allow you to effectively manage and manipulate your database. Remember to always backup your data before performing operations that modify or delete records.