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_28196105_1 (_number VARCHAR, production_code VARCHAR)

### Question ###
What was the number of episodes whose production code is 7ABB21?

### Accurate SQL ###

SELECT COUNT(_number) FROM table_28196105_1 WHERE production_code = "7ABB21"