1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
drop table if exists t1;
SELECT 10,10.0,10.,.1e+2,100.0e-1;
10 10.0 10. .1e+2 100.0e-1
10 10.0 10 10 10
SELECT 6e-05, -6e-05, --6e-05, -6e-05+1.000000;
6e-05 -6e-05 --6e-05 -6e-05+1.000000
6e-05 -6e-05 6e-05 0.99994
SELECT 1e1,1.e1,1.0e1,1e+1,1.e+1,1.0e+1,1e-1,1.e-1,1.0e-1;
1e1 1.e1 1.0e1 1e+1 1.e+1 1.0e+1 1e-1 1.e-1 1.0e-1
10 10 10 10 10 10 0.1 0.1 0.1
create table t1 (f1 float(24),f2 float(52));
show full columns from t1;
Field Type Collation Null Key Default Extra Privileges Comment
f1 float NULL YES NULL
f2 double NULL YES NULL
insert into t1 values(10,10),(1e+5,1e+5),(1234567890,1234567890),(1e+10,1e+10),(1e+15,1e+15),(1e+20,1e+20),(1e+50,1e+50),(1e+150,1e+150);
Warnings:
Warning 1264 Data truncated; out of range for column 'f1' at row 7
Warning 1264 Data truncated; out of range for column 'f1' at row 8
insert into t1 values(-10,-10),(1e-5,1e-5),(1e-10,1e-10),(1e-15,1e-15),(1e-20,1e-20),(1e-50,1e-50),(1e-150,1e-150);
select * from t1;
f1 f2
10 10
100000 100000
1.23457e+9 1234567890
1e+10 10000000000
1e+15 1e+15
1e+20 1e+20
3.40282e+38 1e+50
3.40282e+38 1e+150
-10 -10
1e-5 1e-5
1e-10 1e-10
1e-15 1e-15
1e-20 1e-20
0 1e-50
0 1e-150
drop table t1;
create table t1 (datum double);
insert into t1 values (0.5),(1.0),(1.5),(2.0),(2.5);
select * from t1;
datum
0.5
1
1.5
2
2.5
select * from t1 where datum < 1.5;
datum
0.5
1
select * from t1 where datum > 1.5;
datum
2
2.5
select * from t1 where datum = 1.5;
datum
1.5
drop table t1;
create table t1 (a decimal(7,3) not null, key (a));
insert into t1 values ("0"),("-0.00"),("-0.01"),("-0.002"),("1");
select a from t1 order by a;
a
-0.010
-0.002
-0.000
0.000
1.000
select min(a) from t1;
min(a)
-0.010
drop table t1;
create table t1 (c1 double, c2 varchar(20));
insert t1 values (121,"16");
select c1 + c1 * (c2 / 100) as col from t1;
col
140.36
create table t2 select c1 + c1 * (c2 / 100) as col1, round(c1, 5) as col2, round(c1, 35) as col3, sqrt(c1*1e-15) col4 from t1;
select * from t2;
col1 col2 col3 col4
140.36 121.00000 121 3.47850542618522e-07
show create table t2;
Table Create Table
t2 CREATE TABLE `t2` (
`col1` double default NULL,
`col2` double(22,5) default NULL,
`col3` double default NULL,
`col4` double default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1,t2;
create table t1 (a float);
insert into t1 values (1);
select max(a),min(a),avg(a) from t1;
max(a) min(a) avg(a)
1 1 1
drop table t1;
create table t1 (f float, f2 float(24), f3 float(6,2), d double, d2 float(53), d3 double(10,3), de decimal, de2 decimal(6), de3 decimal(5,2), n numeric, n2 numeric(8), n3 numeric(5,6));
show full columns from t1;
Field Type Collation Null Key Default Extra Privileges Comment
f float NULL YES NULL
f2 float NULL YES NULL
f3 float(6,2) NULL YES NULL
d double NULL YES NULL
d2 double NULL YES NULL
d3 double(10,3) NULL YES NULL
de decimal(10,0) NULL YES NULL
de2 decimal(6,0) NULL YES NULL
de3 decimal(5,2) NULL YES NULL
n decimal(10,0) NULL YES NULL
n2 decimal(8,0) NULL YES NULL
n3 decimal(7,6) NULL YES NULL
drop table t1;
create table t1 (a decimal(7,3) not null, key (a));
insert into t1 values ("0"),("-0.00"),("-0.01"),("-0.002"),("1");
select a from t1 order by a;
a
-0.010
-0.002
-0.000
0.000
1.000
select min(a) from t1;
min(a)
-0.010
drop table t1;
create table t1 (a float(200,100), b double(200,100));
insert t1 values (1.0, 2.0);
select * from t1;
a b
1.000000000000000000000000000000 2.000000000000000000000000000000
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` float(200,30) default NULL,
`b` double(200,30) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 (c20 char);
insert into t1 values (5000.0);
Warnings:
Warning 1265 Data truncated for column 'c20' at row 1
drop table t1;
create table t1 (f float(54));
ERROR 42000: Incorrect column specifier for column 'f'
drop table if exists t1;
create table t1 (d1 double, d2 double unsigned);
insert into t1 set d1 = -1.0;
update t1 set d2 = d1;
Warnings:
Warning 1264 Data truncated; out of range for column 'd2' at row 1
select * from t1;
d1 d2
-1 0
drop table t1;
create table t1 (f float(4,3));
insert into t1 values (-11.0),(-11),("-11"),(11.0),(11),("11");
Warnings:
Warning 1264 Data truncated; out of range for column 'f' at row 1
Warning 1264 Data truncated; out of range for column 'f' at row 2
Warning 1264 Data truncated; out of range for column 'f' at row 3
Warning 1264 Data truncated; out of range for column 'f' at row 4
Warning 1264 Data truncated; out of range for column 'f' at row 5
Warning 1264 Data truncated; out of range for column 'f' at row 6
select * from t1;
f
-9.999
-9.999
-9.999
9.999
9.999
9.999
drop table if exists t1;
create table t1 (f double(4,3));
insert into t1 values (-11.0),(-11),("-11"),(11.0),(11),("11");
Warnings:
Warning 1264 Data truncated; out of range for column 'f' at row 1
Warning 1264 Data truncated; out of range for column 'f' at row 2
Warning 1264 Data truncated; out of range for column 'f' at row 3
Warning 1264 Data truncated; out of range for column 'f' at row 4
Warning 1264 Data truncated; out of range for column 'f' at row 5
Warning 1264 Data truncated; out of range for column 'f' at row 6
select * from t1;
f
-9.999
-9.999
-9.999
9.999
9.999
9.999
drop table if exists t1;
create table t1 (c char(20));
insert into t1 values (5e-28);
select * from t1;
c
5e-28
drop table t1;
create table t1 (c char(6));
insert into t1 values (2e5),(2e6),(2e-4),(2e-5);
select * from t1;
c
200000
2e+06
0.0002
2e-05
drop table t1;
|
