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_30019 ( "Province" text, "Provincial capital" text, "Commandery" text, "Commandery capital" text, "No. of counties" real )

### Question ###
When gaoliang is the commandery what is the commandery capital?

### Accurate SQL ###

SELECT "Commandery capital" FROM table_30019 WHERE "Commandery" = 'Gaoliang 高涼'