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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;