rename column ORACLE

                                    ALTER TABLE my_table RENAME COLUMN old_name TO new_name;

-- To check if column exists before renaming it:
DECLARE
    l_cnt INTEGER;
BEGIN
    SELECT count(*) INTO l_cnt
    FROM dba_tab_columns		-- or all_tab_columns (depending on grants)
    WHERE owner = 'my_schema' AND table_name = 'my_table' 
    	AND column_name = 'my_col';
    IF (l_cnt = 1) THEN
        EXECUTE IMMEDIATE 'ALTER TABLE my_table 
        	RENAME COLUMN my_col TO my_new_name';
    END IF;
END;

                                    ALTER TABLE table_name
  RENAME COLUMN old_name TO new_name;