CREATE TABLE table_12457 ("year" CLOB, "opus" CLOB, "town" CLOB, "kind" CLOB, "manuals" CLOB, "stops" CLOB)

What are the manuals with an opus of 147?
SELECT "manuals" FROM table_12457 WHERE "opus" = '147'
SELECT "manuals" FROM "table_12457" WHERE "opus" = '147'