Hi I have a table(PERSON) that contain file names `ammu.docx`, `gopu.ammu.docx`, `veena.docx`, `maya.ammu.docx` etc... 

I would like to get the count of file having multiple periods. Here (g`opu.ammu.docx`, `maya.ammu.docx`) is 2.

Please help me to do this in SQL.