How can multiple pieces of data be added in one go in MySQL?

In MySQL, you can use the INSERT statement to add multiple rows of data at once. This can be achieved using two methods.

1. Using the VALUES clause:

INSERT INTO table_name (column1, column2, column3) 
VALUES 
  (value1, value2, value3), 
  (value4, value5, value6), 
  (value7, value8, value9);

table_name refers to the name of the table where the data will be inserted, column1, column2, column3 are the column names of the data that will be inserted, value1, value2, value3 are the values of the first row of data, and so on.

1. Use the SELECT statement:

INSERT INTO table_name (column1, column2, column3) 
SELECT value1, value2, value3 FROM another_table;

In this case, table_name refers to the table where the data will be inserted, column1, column2, and column3 are the column names where the data will be inserted, and another_table is another table containing the columns where the data will be inserted.

Multiple data entries can be added to a MySQL table at once, regardless of the method used.