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_11658094_1 ( institution VARCHAR, joined VARCHAR )

### Question ###
Which institutions joined in 1993

### Accurate SQL ###

SELECT institution FROM table_11658094_1 WHERE joined = "1993"