Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17467147_1 (series__number VARCHAR, directed_by VARCHAR, written_by VARCHAR)

### Question ###
When debra j. fisher & erica messer are the writers and the director is patrick norris what is the series number?

### Accurate SQL ###

SELECT series__number FROM table_17467147_1 WHERE directed_by = "Patrick Norris" AND written_by = "Debra J. Fisher & Erica Messer"