Table: canonicus_ships
Columns: ship
builder
namesake
renamed
laid_down
launched
commissioned_or_completed

Question: When was the ship launched when the commissioned or completed(*) is 6 june 1864?
SQL: SELECT "launched" FROM canonicus_ships WHERE "commissioned_or_completed" = '6 June 1864'

Question: When was the ship tecumseh launched?
SQL: SELECT "launched" FROM canonicus_ships WHERE "ship" = 'Tecumseh'

Question: What is the namesake of the ship that was commissioned or completed(*) 16 april 1864?
SQL: SELECT "namesake" FROM canonicus_ships WHERE "commissioned_or_completed" = '16 April 1864'

Question: What is the minimum laid down?
SQL: SELECT MIN("laid_down") FROM canonicus_ships