This is going to depend on the how that column is being populated to begin with. Does your column always get populated with 3 digits - 6 digits - 4 digits etc?  Or are you always looking for the number after the 2nd dash? 

If it's based on digits you could use a SUBSTRING function:

https://www.w3schools.com/sql/func_mysql_substring.asp

If it's based on the # of -'s then you can could use a SUBSTRING_INDEX function:

https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_substring-index

https://stackoverflow.com/questions/14347581/mysql-second-or-third-index-of-in-string

With substring you tell it where to start (your index) and how long of a string you want. Substring_Index will return the left or right portion of the string based on the characters you give it and the instance number you're looking for. You can combine 2 Substring Index functions to give you the mid portion of a string.

Hope that helps. And if you need further assistance, let me know more about the parameters for what you're wanting to include.

Sincerely,
Valiant

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