select format(1.5555,0),format(123.5555,1),format(1234.5555,2),format(12345.55555,3),format(123456.5555,4),format(1234567.5555,5),format("12345.2399",2);
format(1.5555,0)	format(123.5555,1)	format(1234.5555,2)	format(12345.55555,3)	format(123456.5555,4)	format(1234567.5555,5)	format("12345.2399",2)
2	123.6	1,234.56	12,345.556	123,456.5555	1,234,567.55550	12,345.24
select inet_ntoa(inet_aton("255.255.255.255.255.255.255.255"));
inet_ntoa(inet_aton("255.255.255.255.255.255.255.255"))
NULL
select inet_aton("255.255.255.255.255"),inet_aton("255.255.1.255"),inet_aton("0.1.255");
inet_aton("255.255.255.255.255")	inet_aton("255.255.1.255")	inet_aton("0.1.255")
1099511627775	4294902271	65791
select inet_ntoa(1099511627775),inet_ntoa(4294902271),inet_ntoa(511);
inet_ntoa(1099511627775)	inet_ntoa(4294902271)	inet_ntoa(511)
NULL	255.255.1.255	0.0.1.255
select hex(inet_aton('127'));
hex(inet_aton('127'))
7F
select hex(inet_aton('127.1'));
hex(inet_aton('127.1'))
7F000001
select hex(inet_aton('127.1.1'));
hex(inet_aton('127.1.1'))
7F010001
select length(uuid()), charset(uuid()), length(unhex(replace(uuid(),_utf8'-',_utf8'')));
length(uuid())	charset(uuid())	length(unhex(replace(uuid(),_utf8'-',_utf8'')))
36	utf8	16
select length(format('nan', 2)) > 0;
length(format('nan', 2)) > 0
1
select concat("$",format(2500,2));
concat("$",format(2500,2))
$2,500.00
create table t1 ( a timestamp );
insert into t1 values ( '2004-01-06 12:34' );
select a from t1 where left(a+0,6) in ( left(20040106,6) );
a
2004-01-06 12:34:00
select a from t1 where left(a+0,6) = ( left(20040106,6) );
a
2004-01-06 12:34:00
select a from t1 where right(a+0,6) in ( right(20040106123400,6) );
a
2004-01-06 12:34:00
select a from t1 where right(a+0,6) = ( right(20040106123400,6) );
a
2004-01-06 12:34:00
select a from t1 where mid(a+0,6,3) in ( mid(20040106123400,6,3) );
a
2004-01-06 12:34:00
select a from t1 where mid(a+0,6,3) = ( mid(20040106123400,6,3) );
a
2004-01-06 12:34:00
drop table t1;
create table t1 as select uuid(), length(uuid());
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `uuid()` char(36) character set utf8 NOT NULL default '',
  `length(uuid())` int(10) NOT NULL default '0'
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (conn CHAR(7), connection_id INT);
INSERT INTO t1 VALUES ('default', CONNECTION_ID());
SELECT GET_LOCK('bug16501',600);
GET_LOCK('bug16501',600)
1
INSERT INTO t1 VALUES ('con1', CONNECTION_ID());
SELECT IS_USED_LOCK('bug16501') = connection_id
FROM t1
WHERE conn = 'default';
IS_USED_LOCK('bug16501') = connection_id
1
 SELECT GET_LOCK('bug16501',600);
SELECT IS_USED_LOCK('bug16501') = CONNECTION_ID();
IS_USED_LOCK('bug16501') = CONNECTION_ID()
1
SELECT RELEASE_LOCK('bug16501');
RELEASE_LOCK('bug16501')
1
GET_LOCK('bug16501',600)
1
SELECT IS_USED_LOCK('bug16501') = connection_id
FROM t1
WHERE conn = 'con1';
IS_USED_LOCK('bug16501') = connection_id
1
SELECT IS_USED_LOCK('bug16501') = CONNECTION_ID();
IS_USED_LOCK('bug16501') = CONNECTION_ID()
1
SELECT RELEASE_LOCK('bug16501');
RELEASE_LOCK('bug16501')
1
SELECT IS_USED_LOCK('bug16501');
IS_USED_LOCK('bug16501')
NULL
DROP TABLE t1;