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_28499 ( "Institution" text, "Location" text, "Founded" real, "Type" text, "Enrollment" real, "Joined" real, "Nickname" text )

### Question ###
How many joined when the enrollment was 1150 in Sioux City, Iowa?

### Accurate SQL ###

SELECT "Joined" FROM table_28499 WHERE "Enrollment" = '1150' AND "Location" = 'Sioux City, Iowa'