CREATE TABLE table_22000 ("Name  ( year commissioned ) " CLOB, "Owner/operator" CLOB, "Length" CLOB, "Maximum diameter" CLOB, "From/to" CLOB, "Licence number" CLOB)

What is the length for a diameter totaling 450 mm?
SELECT "Length" FROM table_22000 WHERE "Maximum diameter" = '450 mm'
SELECT "Length" FROM "table_22000" WHERE "Maximum diameter" = '450 mm'