CREATE TABLE table_20512 ("Line" CLOB, "Terminals" CLOB, "Status" CLOB, "Length" CLOB, "Total number of stations" FLOAT, "Operator" CLOB)

How many lengths of line 3 are given?
SELECT COUNT("Length") FROM table_20512 WHERE "Line" = 'Line 3'
SELECT COUNT("Length") FROM "table_20512" WHERE "Line" = 'Line 3'