CREATE TABLE table_17902 ("Unit" CLOB, "Type" CLOB, "Net power" CLOB, "Total power" CLOB, "Construction start" CLOB, "Construction finish" CLOB, "Commercial operation" CLOB, "Shut down" CLOB)

What's the shut down state of the unit that's been in commercial operation since 01.02.1984?
SELECT "Shut down" FROM table_17902 WHERE "Commercial operation" = '01.02.1984'
SELECT "Shut down" FROM "table_17902" WHERE "Commercial operation" = '01.02.1984'