|
1
by brian
clean slate |
1 |
drop table if exists t1; |
2 |
select 'a' = 'a', 'a' = 'a ', 'a ' = 'a'; |
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3 |
'a' = 'a' 'a' = 'a ' 'a ' = 'a' |
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4 |
1 1 1 |
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5 |
select 'a\0' = 'a', 'a\0' < 'a', 'a\0' > 'a'; |
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6 |
'a\0' = 'a' 'a\0' < 'a' 'a\0' > 'a' |
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7 |
0 1 0 |
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8 |
select 'a' = 'a\0', 'a' < 'a\0', 'a' > 'a\0'; |
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9 |
'a' = 'a\0' 'a' < 'a\0' 'a' > 'a\0' |
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10 |
0 0 1 |
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11 |
select 'a\0' = 'a ', 'a\0' < 'a ', 'a\0' > 'a '; |
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12 |
'a\0' = 'a ' 'a\0' < 'a ' 'a\0' > 'a ' |
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13 |
0 1 0 |
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14 |
select 'a ' = 'a\0', 'a ' < 'a\0', 'a ' > 'a\0'; |
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15 |
'a ' = 'a\0' 'a ' < 'a\0' 'a ' > 'a\0' |
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16 |
0 0 1 |
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17 |
select 'a a' > 'a', 'a \0' < 'a'; |
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18 |
'a a' > 'a' 'a \0' < 'a' |
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19 |
1 1 |
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20 |
select binary 'a a' > 'a', binary 'a \0' > 'a', binary 'a\0' > 'a'; |
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21 |
binary 'a a' > 'a' binary 'a \0' > 'a' binary 'a\0' > 'a' |
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22 |
1 1 1 |
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23 |
create table t1 (text1 varchar(32) not NULL, KEY key1 (text1)); |
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24 |
insert into t1 values ('teststring'), ('nothing'), ('teststring\t'); |
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25 |
check table t1; |
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26 |
Table Op Msg_type Msg_text |
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27 |
test.t1 check status OK |
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28 |
select * from t1 ignore key (key1) where text1='teststring' or |
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29 |
text1 like 'teststring_%' ORDER BY text1; |
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30 |
text1
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31 |
teststring
|
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32 |
teststring
|
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33 |
select * from t1 where text1='teststring' or text1 like 'teststring_%'; |
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34 |
text1
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35 |
teststring
|
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36 |
teststring
|
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37 |
select * from t1 where text1='teststring' or text1 > 'teststring\t'; |
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38 |
text1
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39 |
teststring
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40 |
select * from t1 order by text1; |
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41 |
text1
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42 |
nothing
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43 |
teststring
|
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44 |
teststring
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45 |
explain select * from t1 order by text1; |
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46 |
id select_type table type possible_keys key key_len ref rows Extra |
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47 |
1 SIMPLE t1 index NULL key1 34 NULL 3 Using index |
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48 |
alter table t1 modify text1 char(32) binary not null; |
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49 |
check table t1; |
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50 |
Table Op Msg_type Msg_text |
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51 |
test.t1 check status OK |
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52 |
select * from t1 ignore key (key1) where text1='teststring' or |
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53 |
text1 like 'teststring_%' ORDER BY text1; |
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54 |
text1
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55 |
teststring
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56 |
teststring
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57 |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 like 'teststring_%'; |
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58 |
concat('|', text1, '|') |
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59 |
|teststring | |
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60 |
|teststring| |
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61 |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 > 'teststring\t'; |
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62 |
concat('|', text1, '|') |
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63 |
|teststring| |
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64 |
select text1, length(text1) from t1 order by text1; |
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65 |
text1 length(text1) |
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66 |
nothing 7 |
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67 |
teststring 11 |
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68 |
teststring 10 |
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69 |
select text1, length(text1) from t1 order by binary text1; |
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70 |
text1 length(text1) |
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71 |
nothing 7 |
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72 |
teststring 10 |
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73 |
teststring 11 |
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74 |
alter table t1 modify text1 blob not null, drop key key1, add key key1 (text1(20)); |
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75 |
insert into t1 values ('teststring '); |
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76 |
select concat('|', text1, '|') from t1 order by text1; |
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77 |
concat('|', text1, '|') |
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78 |
|nothing| |
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79 |
|teststring| |
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80 |
|teststring | |
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81 |
|teststring | |
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82 |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 > 'teststring\t'; |
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83 |
concat('|', text1, '|') |
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84 |
|teststring| |
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85 |
|teststring | |
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86 |
select concat('|', text1, '|') from t1 where text1='teststring'; |
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87 |
concat('|', text1, '|') |
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88 |
|teststring| |
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89 |
select concat('|', text1, '|') from t1 where text1='teststring '; |
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90 |
concat('|', text1, '|') |
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91 |
|teststring | |
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92 |
alter table t1 modify text1 text not null, pack_keys=1; |
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93 |
select concat('|', text1, '|') from t1 where text1='teststring'; |
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94 |
concat('|', text1, '|') |
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95 |
|teststring| |
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96 |
|teststring | |
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97 |
select concat('|', text1, '|') from t1 where text1='teststring '; |
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98 |
concat('|', text1, '|') |
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99 |
|teststring| |
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100 |
|teststring | |
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101 |
explain select concat('|', text1, '|') from t1 where text1='teststring '; |
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102 |
id select_type table type possible_keys key key_len ref rows Extra |
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103 |
1 SIMPLE t1 ref key1 key1 22 const 2 Using where |
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104 |
select concat('|', text1, '|') from t1 where text1 like 'teststring_%'; |
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105 |
concat('|', text1, '|') |
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106 |
|teststring | |
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107 |
|teststring | |
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108 |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 like 'teststring_%'; |
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109 |
concat('|', text1, '|') |
|
110 |
|teststring | |
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111 |
|teststring| |
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112 |
|teststring | |
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113 |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 > 'teststring\t'; |
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114 |
concat('|', text1, '|') |
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115 |
|teststring| |
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116 |
|teststring | |
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117 |
select concat('|', text1, '|') from t1 order by text1; |
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118 |
concat('|', text1, '|') |
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119 |
|nothing| |
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120 |
|teststring | |
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121 |
|teststring| |
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122 |
|teststring | |
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123 |
drop table t1; |
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124 |
create table t1 (text1 varchar(32) not NULL, KEY key1 (text1)) pack_keys=0; |
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125 |
insert into t1 values ('teststring'), ('nothing'), ('teststring\t'); |
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126 |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 like 'teststring_%'; |
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127 |
concat('|', text1, '|') |
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128 |
|teststring | |
|
129 |
|teststring| |
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130 |
select concat('|', text1, '|') from t1 where text1='teststring' or text1 >= 'teststring\t'; |
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131 |
concat('|', text1, '|') |
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132 |
|teststring | |
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133 |
|teststring| |
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134 |
drop table t1; |
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135 |
create table t1 (text1 varchar(32) not NULL, KEY key1 using BTREE (text1)) engine=heap; |
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136 |
insert into t1 values ('teststring'), ('nothing'), ('teststring\t'); |
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137 |
select * from t1 ignore key (key1) where text1='teststring' or |
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138 |
text1 like 'teststring_%' ORDER BY text1; |
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139 |
text1
|
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140 |
teststring
|
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141 |
teststring
|
|
142 |
select * from t1 where text1='teststring' or text1 like 'teststring_%'; |
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143 |
text1
|
|
144 |
teststring
|
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145 |
teststring
|
|
146 |
select * from t1 where text1='teststring' or text1 >= 'teststring\t'; |
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147 |
text1
|
|
148 |
teststring
|
|
149 |
teststring
|
|
150 |
select * from t1 order by text1; |
|
151 |
text1
|
|
152 |
nothing
|
|
153 |
teststring
|
|
154 |
teststring
|
|
155 |
explain select * from t1 order by text1; |
|
156 |
id select_type table type possible_keys key key_len ref rows Extra |
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157 |
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 Using filesort |
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158 |
alter table t1 modify text1 char(32) binary not null; |
|
159 |
select * from t1 order by text1; |
|
160 |
text1
|
|
161 |
nothing
|
|
162 |
teststring
|
|
163 |
teststring
|
|
164 |
drop table t1; |
|
165 |
create table t1 (text1 varchar(32) not NULL, KEY key1 (text1)) engine=innodb; |
|
166 |
insert into t1 values ('teststring'), ('nothing'), ('teststring\t'); |
|
167 |
check table t1; |
|
168 |
Table Op Msg_type Msg_text |
|
169 |
test.t1 check status OK |
|
170 |
select * from t1 where text1='teststring' or text1 like 'teststring_%'; |
|
171 |
text1
|
|
172 |
teststring
|
|
173 |
teststring
|
|
174 |
select * from t1 where text1='teststring' or text1 > 'teststring\t'; |
|
175 |
text1
|
|
176 |
teststring
|
|
177 |
select * from t1 order by text1; |
|
178 |
text1
|
|
179 |
nothing
|
|
180 |
teststring
|
|
181 |
teststring
|
|
182 |
explain select * from t1 order by text1; |
|
183 |
id select_type table type possible_keys key key_len ref rows Extra |
|
184 |
1 SIMPLE t1 index NULL key1 34 NULL 3 Using index |
|
185 |
alter table t1 modify text1 char(32) binary not null; |
|
186 |
select * from t1 order by text1; |
|
187 |
text1
|
|
188 |
nothing
|
|
189 |
teststring
|
|
190 |
teststring
|
|
191 |
alter table t1 modify text1 blob not null, drop key key1, add key key1 (text1(20)); |
|
192 |
insert into t1 values ('teststring '); |
|
193 |
select concat('|', text1, '|') from t1 order by text1; |
|
194 |
concat('|', text1, '|') |
|
195 |
|nothing| |
|
196 |
|teststring| |
|
197 |
|teststring | |
|
198 |
|teststring | |
|
199 |
alter table t1 modify text1 text not null, pack_keys=1; |
|
200 |
select * from t1 where text1 like 'teststring_%'; |
|
201 |
text1
|
|
202 |
teststring
|
|
203 |
teststring
|
|
204 |
select text1, length(text1) from t1 where text1='teststring' or text1 like 'teststring_%'; |
|
205 |
text1 length(text1) |
|
206 |
teststring 11 |
|
207 |
teststring 10 |
|
208 |
teststring 11 |
|
209 |
select text1, length(text1) from t1 where text1='teststring' or text1 >= 'teststring\t'; |
|
210 |
text1 length(text1) |
|
211 |
teststring 11 |
|
212 |
teststring 10 |
|
213 |
teststring 11 |
|
214 |
select concat('|', text1, '|') from t1 order by text1; |
|
215 |
concat('|', text1, '|') |
|
216 |
|nothing| |
|
217 |
|teststring | |
|
218 |
|teststring| |
|
219 |
|teststring | |
|
220 |
drop table t1; |