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_63323 ( "Tie no" text, "Home team" text, "Score" text, "Away team" text, "Date" text )

### Question ###
What's the tie number when the away team was Mansfield Town?

### Accurate SQL ###

SELECT "Tie no" FROM table_63323 WHERE "Away team" = 'mansfield town'