1 mysql> create table w0904procedure (wa char, wb char, wd char, wi char); 2 Query OK, 0 rows affected (0.00 sec) 3  4 mysql> INSERT INTO w0904procedure VALUES(NULL, 0, ‘www0904‘, ‘w0904d‘); 5 ERROR 1406 (22001): Data too long for column ‘wd‘ at row 1 6  7 mysql> desc w0904procedure; 8 +-------+---------+------+-----+---------+-------+ 9 | Field | Type    | Null | Key | Default | Extra |10 +-------+---------+------+-----+---------+-------+11 | wa    | char(1) | YES  |     | NULL    |       |12 | wb    | char(1) | YES  |     | NULL    |       |13 | wd    | char(1) | YES  |     | NULL    |       |14 | wi    | char(1) | YES  |     | NULL    |       |15 +-------+---------+------+-----+---------+-------+16 4 rows in set (0.00 sec)17 18 mysql> DROP PROCEDURE IF EXISTS insert_many_rows_w0904;19 Query OK, 0 rows affected (0.00 sec)20 21 mysql> delimiter //22 mysql> CREATE PROCEDURE insert_many_rows_w0904 (IN loops INT)23     -> BEGIN24     ->  DECLARE v1 INT;25     ->  SET v1=loops;26     ->  WHILE v1 > 0 DO27     ->          INSERT INTO w0904procedure VALUES(NULL, 0, ‘w‘, ‘w‘);28     ->          SET v1 = v1 - 1;29     ->  END WHILE;30     -> END;31     -> //32 Query OK, 0 rows affected (0.00 sec)33 34 mysql> delimiter ;35 mysql>36 mysql> SET @loops=987987;37 Query OK, 0 rows affected (0.00 sec)38 39 mysql> CALL insert_many_rows_w0904(@loops);40 Query OK, 1 row affected (43.05 sec)41 42 43 44 mysql> SELECT * FROM w0904procedure LIMIT 20;45 +------+------+------+------+46 | wa   | wb   | wd   | wi   |47 +------+------+------+------+48 | NULL | 0    | w    | w    |49 | NULL | 0    | w    | w    |50 | NULL | 0    | w    | w    |51 | NULL | 0    | w    | w    |52 | NULL | 0    | w    | w    |53 | NULL | 0    | w    | w    |54 | NULL | 0    | w    | w    |55 | NULL | 0    | w    | w    |56 | NULL | 0    | w    | w    |57 | NULL | 0    | w    | w    |58 | NULL | 0    | w    | w    |59 | NULL | 0    | w    | w    |60 | NULL | 0    | w    | w    |61 | NULL | 0    | w    | w    |62 | NULL | 0    | w    | w    |63 | NULL | 0    | w    | w    |64 | NULL | 0    | w    | w    |65 | NULL | 0    | w    | w    |66 | NULL | 0    | w    | w    |67 | NULL | 0    | w    | w    |68 +------+------+------+------+69 20 rows in set (0.00 sec)70  71 72 mysql> SELECT COUNT(*) FROM w0904procedure;73 +----------+74 | COUNT(*) |75 +----------+76 |   987988 |77 +----------+78 1 row in set (0.00 sec)