MySQL操作: 学习基础SQL语句（mysql的操作语句）

MySQL is one of the most widely used relational database management systems. Learning basic SQL statement is essential for anyone who wants to become a database administrator or analyst. SQL, which stands for Structured Query Language, is a set of commands used to create, modify, and manage relational databases.

In this article, we will learn basic SQL statements that are used in MySQL. We will cover the following topics:

-SELECT statement

-INSERT statement

-UPDATE statement

-DELETE statement

The SELECT statement is used to query data from a database. It allows us to retrieve specific columns and records from a table. For example, the following statement retrieves all rows from the “employees” table:

“`sql

SELECT * FROM employees;

The INSERT statement is used to insert new records into a table. It allows us to specify the columns and data to be inserted. For example, the following statement inserts a new employee into the “employees” table:

```sql
INSERT INTO employees (first_name, last_name, email, department)
VALUES ('John', 'Smith', 'jsmith@example.com', 'IT');

The UPDATE statement is used to modify existing records in a table. It allows us to specify the columns and data to be updated. For example, the following statement updates the email address of an employee in the “employees” table:

“`sql

UPDATE employees

SET email = ‘jsmith2@example.com’

WHERE first_name = ‘John’ AND last_name = ‘Smith’;

The DELETE statement is used to delete records from a table. It allows us to specify the condition to select the records to be deleted. For example, the following statement deletes the employee John Smith from the “employees” table:

```sql
DELETE FROM employees 
WHERE first_name = 'John' AND last_name = 'Smith';

These are some of the most commonly used SQL statements in MySQL. Mastering these basic commands allows us to perform all sorts of operations on the database. In addition to this, there are many more advanced SQL statements that can be used for more specialized operations.