CREATE TABLE table_61531 ("Bow number" CLOB, "Ship name" CLOB, "Launched" CLOB, "Commissioned" CLOB, "Service" CLOB)

When was the ship BRP Miguel Malvar commissioned?
SELECT "Commissioned" FROM table_61531 WHERE "Ship name" = 'brp miguel malvar'
SELECT "Commissioned" FROM "table_61531" WHERE "Ship name" = 'brp miguel malvar'