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_18 (unami_delaware VARCHAR, thomas__1698_ VARCHAR)

### Question ###
What is the Unami Delaware value for a Thomas value of nacha?

### Accurate SQL ###

SELECT unami_delaware FROM table_name_18 WHERE thomas__1698_ = "nacha"