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create table t (b blob); create table tt (b raw(100)); create table ttt(c clob); insert into t select utl_raw.cast_to_raw('12345') from dual; insert into tt select utl_raw.cast_to_raw('12345') from dual; insert into ttt values('12345'); select substr(b, 1, 3) from t; select substr(b, 1, 3) from tt; select substr(c, 1, 3) from ttt;

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