Mega Code Archive

 

Categories / MySQL / Table Index

 

Put the comparison expression in the output column list, perhaps including the values that youre comparing

mysql> mysql> mysql> CREATE TABLE mail     -> (     ->  t               DATETIME,       # when message was sent     ->  senderUser      CHAR(8),        # sender (source user and host)     ->  senderHost      CHAR(20),     ->  recipientUser   CHAR(8),        # recipient (destination user and host)     ->  recipientHost   CHAR(20),     ->  size    BIGINT,         # message size in bytes     ->  INDEX   (t)     -> ); Query OK, 0 rows affected (0.00 sec) mysql> mysql> INSERT INTO mail (t,senderHost,senderUser,recipientHost,recipientUser,size)     ->  VALUES     ->          ('2010-05-11 10:15:08','saturn','barb','mars','tricia',58274),     ->          ('2010-05-12 12:48:13','mars','tricia','venus','gene',194925),     ->          ('2010-05-12 15:02:49','mars','phil','saturn','phil',1048),     ->          ('2010-05-13 13:59:18','saturn','barb','venus','tricia',271),     ->          ('2010-05-14 09:31:37','venus','gene','mars','barb',2291),     ->          ('2010-05-14 11:52:17','mars','phil','saturn','tricia',5781),     ->          ('2010-05-14 14:42:21','venus','barb','venus','barb',98151),     ->          ('2010-05-14 17:03:01','saturn','tricia','venus','phil',2394482),     ->          ('2010-05-15 07:17:48','mars','gene','saturn','gene',3824),     ->          ('2010-05-15 08:50:57','venus','phil','venus','phil',978),     ->          ('2010-05-15 10:25:52','mars','gene','saturn','tricia',998532),     ->          ('2010-05-15 17:35:31','saturn','gene','mars','gene',3856),     ->          ('2010-05-16 09:00:28','venus','gene','mars','barb',613),     ->          ('2010-05-16 23:04:19','venus','phil','venus','barb',10294),     ->          ('2010-05-17 12:49:23','mars','phil','saturn','tricia',873),     ->          ('2010-05-19 22:21:51','saturn','gene','venus','gene',23992)     -> ; Query OK, 16 rows affected (0.00 sec) Records: 16  Duplicates: 0  Warnings: 0 mysql> mysql> mysql> SELECT senderUser, senderUser < 'c', size, size > 5000 FROM mail; +------------+------------------+---------+-------------+ | senderUser | senderUser < 'c' | size    | size > 5000 | +------------+------------------+---------+-------------+ | barb       |                1 |   58274 |           1 | | tricia     |                0 |  194925 |           1 | | phil       |                0 |    1048 |           0 | | barb       |                1 |     271 |           0 | | gene       |                0 |    2291 |           0 | | phil       |                0 |    5781 |           1 | | barb       |                1 |   98151 |           1 | | tricia     |                0 | 2394482 |           1 | | gene       |                0 |    3824 |           0 | | phil       |                0 |     978 |           0 | | gene       |                0 |  998532 |           1 | | gene       |                0 |    3856 |           0 | | gene       |                0 |     613 |           0 | | phil       |                0 |   10294 |           1 | | phil       |                0 |     873 |           0 | | gene       |                0 |   23992 |           1 | +------------+------------------+---------+-------------+ 16 rows in set (0.00 sec) mysql> mysql> mysql> drop table mail; Query OK, 0 rows affected (0.00 sec)