drop table if exists t1, t2, t3;
CREATE TABLE t1 (
event_date datetime DEFAULT '2014-02-22' NOT NULL,
obtype int DEFAULT '0' NOT NULL,
event_id int DEFAULT '0' NOT NULL,
extra int,
PRIMARY KEY (event_date,obtype,event_id)
);
INSERT INTO t1(event_date,obtype,event_id) VALUES ('1999-07-10',100100,24), ('1999-07-11',100100,25),
('1999-07-13',100600,0), ('1999-07-13',100600,4), ('1999-07-13',100600,26),
('1999-07-14',100600,10), ('1999-07-15',100600,16), ('1999-07-15',100800,45),
('1999-07-15',101000,47), ('1999-07-16',100800,46), ('1999-07-20',100600,5),
('1999-07-20',100600,27), ('1999-07-21',100600,11), ('1999-07-22',100600,17),
('1999-07-23',100100,39), ('1999-07-24',100100,39), ('1999-07-24',100500,40),
('1999-07-25',100100,39), ('1999-07-27',100600,1), ('1999-07-27',100600,6),
('1999-07-27',100600,28), ('1999-07-28',100600,12), ('1999-07-29',100500,41),
('1999-07-29',100600,18), ('1999-07-30',100500,41), ('1999-07-31',100500,41),
('1999-08-01',100700,34), ('1999-08-03',100600,7), ('1999-08-03',100600,29),
('1999-08-04',100600,13), ('1999-08-05',100500,42), ('1999-08-05',100600,19),
('1999-08-06',100500,42), ('1999-08-07',100500,42), ('1999-08-08',100500,42),
('1999-08-10',100600,2), ('1999-08-10',100600,9), ('1999-08-10',100600,30),
('1999-08-11',100600,14), ('1999-08-12',100600,20), ('1999-08-17',100500,8),
('1999-08-17',100600,31), ('1999-08-18',100600,15), ('1999-08-19',100600,22),
('1999-08-24',100600,3), ('1999-08-24',100600,32), ('1999-08-27',100500,43),
('1999-08-31',100600,33), ('1999-09-17',100100,37), ('1999-09-18',100100,37),
('1999-09-19',100100,37), ('2000-12-18',100700,38);
select event_date,obtype,event_id from t1 WHERE event_date >= '1999-07-01' AND event_date < '1999-07-15' AND (obtype=100600 OR obtype=100100) ORDER BY event_date;
event_date	obtype	event_id
1999-07-10 00:00:00	100100	24
1999-07-11 00:00:00	100100	25
1999-07-13 00:00:00	100600	0
1999-07-13 00:00:00	100600	4
1999-07-13 00:00:00	100600	26
1999-07-14 00:00:00	100600	10
select event_date,obtype,event_id from t1 WHERE event_date >= '1999-07-01' AND event_date <= '1999-07-15' AND (obtype=100600 OR obtype=100100) or event_date >= '1999-07-01' AND event_date <= '1999-07-15' AND obtype=100099;
event_date	obtype	event_id
1999-07-10 00:00:00	100100	24
1999-07-11 00:00:00	100100	25
1999-07-13 00:00:00	100600	0
1999-07-13 00:00:00	100600	4
1999-07-13 00:00:00	100600	26
1999-07-14 00:00:00	100600	10
1999-07-15 00:00:00	100600	16
drop table t1;
CREATE TABLE t1 (
PAPER_ID smallint DEFAULT '0' NOT NULL,
YEAR smallint DEFAULT '0' NOT NULL,
ISSUE smallint DEFAULT '0' NOT NULL,
CLOSED tinyint DEFAULT '0' NOT NULL,
ISS_DATE datetime DEFAULT '2014-02-22' NOT NULL,
PRIMARY KEY (PAPER_ID,YEAR,ISSUE)
);
INSERT INTO t1 VALUES (3,1999,34,0,'1999-07-12'), (1,1999,111,0,'1999-03-23'),
(1,1999,222,0,'1999-03-23'), (3,1999,33,0,'1999-07-12'),
(3,1999,32,0,'1999-07-12'), (3,1999,31,0,'1999-07-12'),
(3,1999,30,0,'1999-07-12'), (3,1999,29,0,'1999-07-12'),
(3,1999,28,0,'1999-07-12'), (1,1999,40,1,'1999-05-01'),
(1,1999,41,1,'1999-05-01'), (1,1999,42,1,'1999-05-01'),
(1,1999,46,1,'1999-05-01'), (1,1999,47,1,'1999-05-01'),
(1,1999,48,1,'1999-05-01'), (1,1999,49,1,'1999-05-01'),
(1,1999,50,0,'1999-05-01'), (1,1999,51,0,'1999-05-01'),
(1,1999,200,0,'1999-06-28'), (1,1999,52,0,'1999-06-28'),
(1,1999,53,0,'1999-06-28'), (1,1999,54,0,'1999-06-28'),
(1,1999,55,0,'1999-06-28'), (1,1999,56,0,'1999-07-01'),
(1,1999,57,0,'1999-07-01'), (1,1999,58,0,'1999-07-01'),
(1,1999,59,0,'1999-07-01'), (1,1999,60,0,'1999-07-01'),
(3,1999,35,0,'1999-07-12');
select YEAR,ISSUE from t1 where PAPER_ID=3 and (YEAR>1999 or (YEAR=1999 and ISSUE>28))  order by YEAR,ISSUE;
YEAR	ISSUE
1999	29
1999	30
1999	31
1999	32
1999	33
1999	34
1999	35
drop table t1;
CREATE TABLE t1 (
id int NOT NULL auto_increment,
parent_id int DEFAULT '0' NOT NULL,
`level` tinyint DEFAULT '0' NOT NULL,
PRIMARY KEY (id)
);
INSERT INTO t1 VALUES (1,0,0), (3,1,1), (4,1,1), (8,2,2), (9,2,2), (17,3,2),
(22,4,2), (24,4,2), (28,5,2), (29,5,2), (30,5,2), (31,6,2), (32,6,2), (33,6,2),
(203,7,2), (202,7,2), (20,3,2), (157,0,0), (193,5,2), (40,7,2), (2,1,1),
(15,2,2), (6,1,1), (34,6,2), (35,6,2), (16,3,2), (7,1,1), (36,7,2), (18,3,2),
(26,5,2), (27,5,2), (183,4,2), (38,7,2), (25,5,2), (37,7,2), (21,4,2),
(19,3,2), (5,1,1), (179,5,2);
SELECT * FROM t1 WHERE `level` = 1 AND parent_id = 1;
id	parent_id	level
2	1	1
3	1	1
4	1	1
5	1	1
6	1	1
7	1	1
SELECT * FROM t1 WHERE `level` = 1 AND parent_id = 1 order by id;
id	parent_id	level
2	1	1
3	1	1
4	1	1
5	1	1
6	1	1
7	1	1
drop table t1;
create table t1(
Satellite		varchar(25)	not null,
SensorMode		varchar(25)	not null,
FullImageCornersUpperLeftLongitude	double	not null,
FullImageCornersUpperRightLongitude	double	not null,
FullImageCornersUpperRightLatitude	double	not null,
FullImageCornersLowerRightLatitude	double	not null,
primary key(Satellite,SensorMode));
insert into t1 values('OV-3','PAN1',91,-92,40,50);
insert into t1 values('OV-4','PAN1',91,-92,40,50);
select * from t1 where t1.Satellite = 'OV-3' and t1.SensorMode = 'PAN1' and t1.FullImageCornersUpperLeftLongitude > -90.000000 and t1.FullImageCornersUpperRightLongitude < -82.000000;
Satellite	SensorMode	FullImageCornersUpperLeftLongitude	FullImageCornersUpperRightLongitude	FullImageCornersUpperRightLatitude	FullImageCornersLowerRightLatitude
OV-3	PAN1	91	-92	40	50
drop table t1;
create table t1 ( aString char(100) not null default '', primary key (aString) , extra char(100));
insert into t1 (aString) values ( 'believe in myself' ), ( 'believe' ), ('baaa' ), ( 'believe in love');
select * from t1 where aString < 'believe in myself' order by aString;
aString	extra
baaa	NULL
believe	NULL
believe in love	NULL
select * from t1 where aString > 'believe in love' order by aString;
aString	extra
believe in myself	NULL
drop table t1;
CREATE TABLE t1 (
t1ID int NOT NULL ,
art binary(1) NOT NULL default '',
KNR char(5) NOT NULL default '',
RECHNR char(6) NOT NULL default '',
POSNR char(2) NOT NULL default '',
ARTNR char(10) NOT NULL default '',
TEX char(70) NOT NULL default '',
PRIMARY KEY  (t1ID)
);
INSERT INTO t1 (t1ID,art) VALUES
(0,'j'),
(1,'J'),
(2,'J'),
(3,'j'),
(4,'J'),
(5,'J'),
(6,'j'),
(7,'J'),
(8,'J'),
(9,'j'),
(10,'J'),
(11,'J'),
(12,'j'),
(13,'J'),
(14,'J'),
(15,'j'),
(16,'J'),
(17,'J'),
(18,'j'),
(19,'J'),
(20,'J'),
(21,'j'),
(22,'J'),
(23,'J'),
(24,'j'),
(25,'J'),
(26,'J'),
(27,'j'),
(28,'J'),
(29,'J'),
(30,'j'),
(31,'J'),
(32,'J'),
(33,'j'),
(34,'J'),
(35,'J'),
(36,'j'),
(37,'J'),
(38,'J'),
(39,'j'),
(40,'J'),
(41,'J'),
(42,'j'),
(43,'J'),
(44,'J'),
(45,'j'),
(46,'J'),
(47,'J'),
(48,'j'),
(49,'J'),
(50,'J'),
(51,'j'),
(52,'J'),
(53,'J'),
(54,'j'),
(55,'J'),
(56,'J'),
(57,'j'),
(58,'J'),
(59,'J'),
(60,'j'),
(61,'J'),
(62,'J'),
(63,'j'),
(64,'J'),
(65,'J'),
(66,'j'),
(67,'J'),
(68,'J'),
(69,'j'),
(70,'J'),
(71,'J'),
(72,'j'),
(73,'J'),
(74,'J'),
(75,'j'),
(76,'J'),
(77,'J'),
(78,'j'),
(79,'J'),
(80,'J'),
(81,'j'),
(82,'J'),
(83,'J'),
(84,'j'),
(85,'J'),
(86,'J'),
(87,'j'),
(88,'J'),
(89,'J'),
(90,'j'),
(91,'J'),
(92,'J'),
(93,'j'),
(94,'J'),
(95,'J'),
(96,'j'),
(97,'J'),
(98,'J'),
(99,'j'),
(100,'J'),
(101,'J'),
(102,'j'),
(103,'J'),
(104,'J'),
(105,'j'),
(106,'J'),
(107,'J'),
(108,'j'),
(109,'J'),
(110,'J'),
(111,'j'),
(112,'J'),
(113,'J'),
(114,'j'),
(115,'J'),
(116,'J'),
(117,'j'),
(118,'J'),
(119,'J'),
(120,'j'),
(121,'J'),
(122,'J'),
(123,'j'),
(124,'J'),
(125,'J'),
(126,'j'),
(127,'J'),
(128,'J'),
(129,'j'),
(130,'J'),
(131,'J'),
(132,'j'),
(133,'J'),
(134,'J'),
(135,'j'),
(136,'J'),
(137,'J'),
(138,'j'),
(139,'J'),
(140,'J'),
(141,'j'),
(142,'J'),
(143,'J'),
(144,'j'),
(145,'J'),
(146,'J'),
(147,'j'),
(148,'J'),
(149,'J'),
(150,'j'),
(151,'J'),
(152,'J'),
(153,'j'),
(154,'J'),
(155,'J'),
(156,'j'),
(157,'J'),
(158,'J'),
(159,'j'),
(160,'J'),
(161,'J'),
(162,'j'),
(163,'J'),
(164,'J'),
(165,'j'),
(166,'J'),
(167,'J'),
(168,'j'),
(169,'J'),
(170,'J'),
(171,'j'),
(172,'J'),
(173,'J'),
(174,'j'),
(175,'J'),
(176,'J'),
(177,'j'),
(178,'J'),
(179,'J'),
(180,'j'),
(181,'J'),
(182,'J'),
(183,'j'),
(184,'J'),
(185,'J'),
(186,'j'),
(187,'J'),
(188,'J'),
(189,'j'),
(190,'J'),
(191,'J'),
(192,'j'),
(193,'J'),
(194,'J'),
(195,'j'),
(196,'J'),
(197,'J'),
(198,'j'),
(199,'J');
select count(*) from t1 where upper(art) = 'J';
count(*)
133
select count(*) from t1 where art = 'J' or art = 'j';
count(*)
200
select count(*) from t1 where art = 'j' or art = 'J';
count(*)
200
select count(*) from t1 where art = 'j';
count(*)
67
select count(*) from t1 where art = 'J';
count(*)
133
drop table t1;
CREATE TABLE t1 (
a int,
b int,
c int,
primary key(a,b)
);
INSERT INTO t1(a,b) VALUES
(1,1),(2,1),(3,1),(4,1),(5,1),(6,1),(7,1),(8,1),(9,1),(10,2),
(13,2),(14,2),(15,2),(16,2),(17,3),(16,3),(19,3),(20,3),
(21,4),(22,5),(23,5),(24,5),(25,5),(26,5),(30,5),(31,5),(32,5),
(33,5),(34,5),(35,5);
SELECT * FROM t1 WHERE a IN(1,2) AND b=5;
a	b	c
DROP TABLE t1;
create table t1(c1 varchar(1024),c2 varchar(1024), c3 varchar(1024), primary key(c1,c2,c3), extra varchar(1024));
insert into t1(c1,c2,c3) values ('s1_1','s1_2','s1_3'),('s2_1','s2_2','s2_3');
select * from t1 where c1 in ('s1_1','s2_1') and c2 in ('s2_1','s1_2');
c1	c2	c3	extra
s1_1	s1_2	s1_3	NULL
drop table t1;
create table t2 (x bigint not null primary key, y bigint);
insert into t2(x) values (-16);
insert into t2(x) values (-15);
select * from t2;
x	y
-16	NULL
-15	NULL
select count(*) from t2 where x>0;
count(*)
0
select count(*) from t2 where x=0;
count(*)
0
select count(*) from t2 where x<0;
count(*)
2
select count(*) from t2 where x < -16;
count(*)
0
select count(*) from t2 where x = -16;
count(*)
1
select count(*) from t2 where x > -16;
count(*)
1
select count(*) from t2 where x = 1844674407370955160;
count(*)
0
drop table t2;
create table t1 (
c1  char(10) primary key, c2  char(10), c3  char(10), c4  char(10),
c5  char(10), c6  char(10), c7  char(10), c8  char(10),
c9  char(10), c10 char(10), c11 char(10), c12 char(10),
c13 char(10), c14 char(10), c15 char(10), c16 char(10)
);
insert into t1 (c1) values ('1');
select * from t1 where
c1 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c2 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c3 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c4 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c5 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c6 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c7 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c8 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c9 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC')
and c10 in ('abcdefgh', '123456789', 'qwertyuio', 'asddfgh',
'abcdefg1', '123456781', 'qwertyui1', 'asddfg1',
'abcdefg2', '123456782', 'qwertyui2', 'asddfg2',
'abcdefg3', '123456783', 'qwertyui3', 'asddfg3',
'abcdefg4', '123456784', 'qwertyui4', 'asddfg4',
'abcdefg5', '123456785', 'qwertyui5', 'asddfg5',
'abcdefg6', '123456786', 'qwertyui6', 'asddfg6',
'abcdefg7', '123456787', 'qwertyui7', 'asddfg7',
'abcdefg8', '123456788', 'qwertyui8', 'asddfg8',
'abcdefg9', '123456789', 'qwertyui9', 'asddfg9',
'abcdefgA', '12345678A', 'qwertyuiA', 'asddfgA',
'abcdefgB', '12345678B', 'qwertyuiB', 'asddfgB',
'abcdefgC', '12345678C', 'qwertyuiC', 'asddfgC');
c1	c2	c3	c4	c5	c6	c7	c8	c9	c10	c11	c12	c13	c14	c15	c16
drop table t1;