What is the usage of the mysql select statement?

The MySQL SELECT statement is used to retrieve data from a table. Its basic syntax is as follows:

Retrieve specific columns from a table based on certain conditions, order them in ascending or descending order, and limit the number of rows returned.

Among them:

1. Column names: the names of the fields to be retrieved, can be single or multiple fields, separated by commas.
2. Table Name: The name of the table from which data needs to be retrieved.
3. Optional WHERE conditions can be used to filter data that meet the criteria.
4. ORDER BY clause: Optional parameter used to sort the results, default sorting is in ascending order. ASC indicates ascending order and DESC indicates descending order.
5. LIMIT: An optional parameter used to restrict the number of results returned.

For example, here is an example of a simple SELECT statement:

Retrieve all data from the customers table.

This will retrieve all the data from the “customers” table.

Another example:

Retrieve the names and ages of customers who are older than 18, sort them by age in descending order, and limit the results to the 10 oldest customers.

This will retrieve the top 10 records from the “customers” table where the age is greater than 18, and sort them in descending order by age, only returning the data for the name and age fields.

The above is the basic usage of the MySQL SELECT statement, which can be used to retrieve data based on different parameters and conditions according to actual needs.