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CREATE OR REPLACE FUNCTION ReverseString(p_str IN VARCHAR2) RETURN VARCHAR2 IS v_len NUMBER := LENGTH(p_str); v_i NUMBER := v_len; v_reversed_str VARCHAR2(4000) := ''; BEGIN WHILE v_i > 0 LOOP v_reversed_str := v_reversed_str || SUBSTR(p_str, v_i, 1); v_i := v_i - 1; END LOOP; RETURN v_reversed_str; END; SELECT ReverseString('hello') FROM dual;

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