CREATE TABLE table_203_228 (id NUMBER, "#" NUMBER, "title" CLOB, "songwriters" CLOB, "producer ( s ) " CLOB, "performer  ( s ) " CLOB)

total number of performers other than o.credle :
SELECT COUNT(DISTINCT "songwriters") FROM table_203_228 WHERE "songwriters" <> 'o. credle'
SELECT COUNT(DISTINCT "songwriters") FROM "table_203_228" WHERE "songwriters" <> 'o. credle'