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_12592074_1 (launched VARCHAR, commissioned_or_completed_ VARCHAR, _ VARCHAR)

### Question ###
When was the ship launched when the commissioned or completed(*) is 6 june 1864?

### Accurate SQL ###

SELECT launched FROM table_12592074_1 WHERE commissioned_or_completed_ * _ = "6 June 1864"