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_1817879_2 (length__miles_ VARCHAR, endpoints VARCHAR)

### Question ###
What is the length  (miles) when pico to 7th st/metro center are the endpoints?

### Accurate SQL ###

SELECT length__miles_ FROM table_1817879_2 WHERE endpoints = "Pico to 7th St/Metro Center"