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_70 ( year_entered_league VARCHAR, university VARCHAR )

### Question ###
What is the year of entry for the University of Essex?

### Accurate SQL ###

SELECT year_entered_league FROM table_name_70 WHERE university = "university of essex"