I suggest you to install Group Stats plugin. Here is a quick tutorial:

1. Search for the Group Stats icon
2. Select the layer in which you have the Codes
3. Select the attribute (in your case Code)
4. Click on Calculate

The Count will appear. If you go to preference you should be able to select only Count avoiding the other parameters to be display (this is not my case...). Remember before Save you have to select the features you want to. Here is a more advanced tutorial written by Anita Graser.

I suggest you to install Group Stats plugin. Here is a quick tutorial:

1. Search for the Group Stats icon
2. Select the layer in which you have the Codes
3. Select the attribute (in your case Code)
4. Click on Calculate

The Count will appear. If you go to preferences you should be able to select only Count avoiding the other parameters to be displayed (this is not my case...). Remember before click Save button you have to select the fields you want to add to your .csv: hold on Shift for do that. Here is a more advanced tutorial written by Anita Graser.

I suggest you to install Group Stats plugin. Run it, simply select the layer and the attribute and click calculate.

I suggest you to install Group Stats plugin. Here is a quick tutorial:

1. Search for the Group Stats icon
2. Select the layer in which you have the Codes
3. Select the attribute (in your case Code)
4. Click on Calculate

The Count will appear. If you go to preference you should be able to select only Count avoiding the other parameters to be display (this is not my case...). Remember before Save you have to select the features you want to. Here is a more advanced tutorial written by Anita Graser.