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1
by brian
clean slate |
1 |
drop table if exists t1; |
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select 0x41,0x41+0,0x41 | 0x7fffffffffffffff | 0,0xffffffffffffffff | 0 ; |
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3 |
0x41 0x41+0 0x41 | 0x7fffffffffffffff | 0 0xffffffffffffffff | 0 |
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A 65 9223372036854775807 18446744073709551615 |
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select 0x31+1,concat(0x31)+1,-0xf; |
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0x31+1 concat(0x31)+1 -0xf |
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50 2 -15 |
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select x'31',X'ffff'+0; |
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x'31' X'ffff'+0 |
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10 |
1 65535 |
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create table t1 (ID int(8) unsigned zerofill not null auto_increment,UNIQ bigint(21) unsigned zerofill not null,primary key (ID),unique (UNIQ) ); |
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insert into t1 set UNIQ=0x38afba1d73e6a18a; |
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insert into t1 set UNIQ=123; |
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explain extended select * from t1 where UNIQ=0x38afba1d73e6a18a; |
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id select_type table type possible_keys key key_len ref rows filtered Extra |
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1 SIMPLE t1 const UNIQ UNIQ 8 const 1 100.00 |
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Warnings: |
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Note 1003 select '00000001' AS `ID`,'004084688022709641610' AS `UNIQ` from `test`.`t1` where 1 |
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drop table t1; |
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select x'hello'; |
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21 |
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'x'hello'' at line 1 |
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select 0xfg; |
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23 |
ERROR 42S22: Unknown column '0xfg' in 'field list' |
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create table t1 select 1 as x, 2 as xx; |
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select x,xx from t1; |
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x xx |
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1 2 |
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28 |
drop table t1; |
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show create table t1; |
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30 |
Table Create Table |
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t1 CREATE TABLE `t1` ( |
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`a` varbinary(255) DEFAULT NULL, |
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`b` varchar(255) DEFAULT NULL |
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 |
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select length(a), length(b) from t1; |
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length(a) length(b) |
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255 3 |
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38 |
255 3 |
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CHECK TABLE t1 FOR UPGRADE; |
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Table Op Msg_type Msg_text |
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test.t1 check error Table upgrade required. Please do "REPAIR TABLE `t1`" to fix it! |
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REPAIR TABLE t1; |
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Table Op Msg_type Msg_text |
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test.t1 repair status OK |
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show create table t1; |
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46 |
Table Create Table |
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t1 CREATE TABLE `t1` ( |
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`a` varbinary(255) DEFAULT NULL, |
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`b` varchar(255) DEFAULT NULL |
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 |
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select length(a), length(b) from t1; |
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length(a) length(b) |
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3 3 |
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3 3 |
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insert into t1 values("ccc", "ddd"); |
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select length(a), length(b) from t1; |
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length(a) length(b) |
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58 |
3 3 |
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59 |
3 3 |
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60 |
3 3 |
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select hex(a), hex(b) from t1; |
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hex(a) hex(b) |
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63 |
616161 636363 |
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626262 646464 |
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636363 646464 |
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select concat("'", a, "'"), concat("'", b, "'") from t1; |
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concat("'", a, "'") concat("'", b, "'") |
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'aaa' 'ccc' |
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'bbb' 'ddd' |
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'ccc' 'ddd' |
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drop table t1; |
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create table t1(a varbinary(255)); |
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insert into t1 values("aaa "); |
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select length(a) from t1; |
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75 |
length(a) |
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6
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alter table t1 modify a varchar(255); |
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select length(a) from t1; |
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79 |
length(a) |
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80 |
6
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81 |
drop table t1; |
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82 |
drop table if exists table_28127_a; |
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drop table if exists table_28127_b; |
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create table table_28127_a(0b02 int); |
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show create table table_28127_a; |
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Table Create Table |
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table_28127_a CREATE TABLE `table_28127_a` ( |
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`0b02` int(11) DEFAULT NULL |
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 |
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create table table_28127_b(0b2 int); |
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show create table table_28127_b; |
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Table Create Table |
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table_28127_b CREATE TABLE `table_28127_b` ( |
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`0b2` int(11) DEFAULT NULL |
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 |
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96 |
drop table table_28127_a; |
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drop table table_28127_b; |