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_21452 ( "Game" real, "Date" text, "Team" text, "Score" text, "High points" text, "High rebounds" text, "High assists" text, "Location Attendance" text, "Record" text )

### Question ###
How many different items appear in the high points column when the location attendance was US Airways Center 18,422?

### Accurate SQL ###

SELECT COUNT("High points") FROM table_21452 WHERE "Location Attendance" = 'US Airways Center 18,422'