The correct method for Mysql to export data

I want to export the database under the Mysql command line, but I don't know the error every day. I realized that mysqldump is not a mysql command, so I cannot export it under the Mysql command line.

I want to export the database under the Mysql command line, but I don't know the error every day. I realized that mysqldump is not a mysql command, so I cannot export it under the Mysql command line.

I have been suffering for a long time before. I want to export the database under the Mysql command line, but I don't know the error every day. Later I realized that mysqldump is not a mysql command, so I cannot export it under the Mysql command line.

The following are incorrect practices:

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The following is the correct method:

That is, mysql Database Export commands can only be used in the system command line, but not in the mysql command line.