SELECT a、b、a + b INTO OUTFILE'/tmp/result.txt' FIELDS TERMINATED BY'、' OPTIONALLY ENCLOSED BY'"' LINES TERMINATED BY'\ n'FROM test_table;
SELECT a、b、a + b INTO OUTFILE'/tmp/result.txt' FIELDS TERMINATED BY'、' OPTIONALLY ENCLOSED BY'"' LINES TERMINATED BY'\ n'FROM test_table;