I use Ubuntu 14.10 and PhpMyAdmin.
I have a 'big' MySQL database, the size is 900MB. I need just the structure of this database, to use it on my local machine. How can I export the structure only?
Since you specifically asked about phpMyAdmin and the previous answers, while correct, are both about doing this on the command line:
Navigate to the database you wish to export. Across the top row of tabs click "Export"
Next, click the Custom radio button
Halfway down the "Format-specific options" area, select "structure" (the default is "structure and data")
Check the other options and press Go to download your .sql file with no data, only the table structure.
Dump the table structure only using the command below:
mysqldump -d -h localhost -uYourUsername -pYourPassword databasename > dumpfile.sql
Select your database or table.
Select the Export tab.
Below Export method, select Custom.
Below Tables, check the appropriate Structure boxes.
mysqldump --no-data big_db_name > big_db_name.structure.sql