What is the purpose of using SELECT and INSERT in MySQL…

In a MySQL database, SELECT and INSERT are two commonly used SQL commands, used respectively for querying data and inserting data.

1. The SELECT command is used to retrieve (query) data from a database table. It allows you to specify the columns to be returned, filtering criteria, sorting rules, etc. Using SELECT, specific rows and columns can be selected from one or more tables and the results returned to the user.

Here is the basic syntax for the SELECT command:

SELECT column1, column2, ...
FROM table_name
WHERE condition;

Among them:

1. “Column1, column2, … are the columns you want to select.”
2. table_name is the name of the table you want to query.
3. The condition is optional and is used to filter rows that meet specific criteria.

For example, the following query statement will select all rows from a table called users and will return the data from the name and email columns.

SELECT name, email
FROM users;

1. The INSERT command is used to add new data entries into a database table. With the INSERT command, you can specify the table you want to insert data into, the columns you want to insert data into, and the values you want to insert.

Here is the basic syntax for the INSERT command:

INSERT INTO table_name (column1, column2, ...)
VALUES (value1, value2, ...);

Among them:

1. table_name is the name of the table where you want to insert data.
2. (column1, column2, …) are the names of the columns where you want to insert data, and it can be omitted.
3. VALUES represent the specific values to be inserted.

For example, the following example will insert a row of data into a table named users, including the values for the name and email columns.

INSERT INTO users (name, email)
VALUES ('John Doe', 'john.doe@example.com');

This will insert a new data record into the users table, with the name column value as ‘John Doe’ and the email column value as ‘john.doe@example.com’.