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_28 (venue VARCHAR, competition VARCHAR, position VARCHAR, year VARCHAR, notes VARCHAR)

### Question ###
Which venue did the African Championships have after 2006 with a position of 2nd and 3000 m s'chase in notes?

### Accurate SQL ###

SELECT venue FROM table_name_28 WHERE year > 2006 AND notes = "3000 m s'chase" AND position = "2nd" AND competition = "african championships"