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_21564794_3 ( championships_in_st_louis VARCHAR, began_in_st_louis VARCHAR )

### Question ###
How may championships were won by the team that started in 1950?

### Accurate SQL ###

SELECT championships_in_st_louis FROM table_21564794_3 WHERE began_in_st_louis = 1950