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_42501 ( "Date" text, "at/vs." text, "Opponent'" text, "Score'" text, "Attendance" real, "Record" text )

### Question ###
How many were in Attendance on February 21, 1988 against the New Jersey Saints?

### Accurate SQL ###

SELECT SUM("Attendance") FROM table_42501 WHERE "Opponent'" = 'new jersey saints' AND "Date" = 'february 21, 1988'