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_name_29 (entered_service VARCHAR, serial_no VARCHAR)

### Question ###
What is the entered service date for serial number 85-1222?

### Accurate SQL ###

SELECT entered_service FROM table_name_29 WHERE serial_no = "85-1222"