CREATE TABLE table_12592074_1 (launched VARCHAR2, commissioned_or_completed_ VARCHAR2, _ VARCHAR2)

When was the ship launched when the commissioned or completed(*) is 6 june 1864?
SELECT launched FROM table_12592074_1 WHERE commissioned_or_completed_ * _ = "6 June 1864"
SELECT "launched" FROM "table_12592074_1" WHERE "6 June 1864" = "commissioned_or_completed_" * "_"