201 lines
5.7 KiB
Plaintext
201 lines
5.7 KiB
Plaintext
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drop table if exists t1,t2;
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create table t1 (name char(20) not null, primary key (name));
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create table t2 (name char(20) binary not null, primary key (name));
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insert into t1 values ("<22>");
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insert into t1 values ("<22>");
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insert into t1 values ("<22>");
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insert into t2 select * from t1;
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select * from t1 order by name;
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name
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<EFBFBD>
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<EFBFBD>
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<EFBFBD>
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select concat("*",name,"*") from t1 order by 1;
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concat("*",name,"*")
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*<2A>*
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*<2A>*
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*<2A>*
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select min(name),min(concat("*",name,"*")),max(name),max(concat("*",name,"*")) from t1;
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min(name) min(concat("*",name,"*")) max(name) max(concat("*",name,"*"))
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<EFBFBD> *<2A>* <09> *<2A>*
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select * from t2 order by name;
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name
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<EFBFBD>
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<EFBFBD>
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<EFBFBD>
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select concat("*",name,"*") from t2 order by 1;
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concat("*",name,"*")
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*<2A>*
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*<2A>*
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*<2A>*
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select min(name),min(concat("*",name,"*")),max(name),max(concat("*",name,"*")) from t2;
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min(name) min(concat("*",name,"*")) max(name) max(concat("*",name,"*"))
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<EFBFBD> *<2A>* <09> *<2A>*
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select name from t1 where name between '<27>' and '<27>';
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name
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<EFBFBD>
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<EFBFBD>
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select name from t2 where name between '<27>' and '<27>';
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name
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<EFBFBD>
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<EFBFBD>
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<EFBFBD>
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select name from t2 where name between '<27>' and '<27>';
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name
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drop table t1,t2;
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create table t1 (a char(10) not null, b char(10) binary not null,key (a), key(b));
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insert into t1 values ("hello ","hello "),("hello2 ","hello2 ");
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select concat("-",a,"-",b,"-") from t1 where a="hello";
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concat("-",a,"-",b,"-")
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-hello-hello-
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select concat("-",a,"-",b,"-") from t1 where a="hello ";
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concat("-",a,"-",b,"-")
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-hello-hello-
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select concat("-",a,"-",b,"-") from t1 ignore index (a) where a="hello ";
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concat("-",a,"-",b,"-")
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-hello-hello-
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select concat("-",a,"-",b,"-") from t1 where b="hello";
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concat("-",a,"-",b,"-")
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-hello-hello-
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select concat("-",a,"-",b,"-") from t1 where b="hello ";
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concat("-",a,"-",b,"-")
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-hello-hello-
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select concat("-",a,"-",b,"-") from t1 ignore index (b) where b="hello ";
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concat("-",a,"-",b,"-")
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-hello-hello-
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alter table t1 modify b tinytext not null, drop key b, add key (b(100));
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select concat("-",a,"-",b,"-") from t1;
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concat("-",a,"-",b,"-")
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-hello-hello-
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-hello2-hello2-
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select concat("-",a,"-",b,"-") from t1 where b="hello ";
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concat("-",a,"-",b,"-")
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-hello-hello-
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select concat("-",a,"-",b,"-") from t1 ignore index (b) where b="hello ";
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concat("-",a,"-",b,"-")
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-hello-hello-
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drop table t1;
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create table t1 (b char(8));
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insert into t1 values(NULL);
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select b from t1 where binary b like '';
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b
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select b from t1 group by binary b like '';
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b
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NULL
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select b from t1 having binary b like '';
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b
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drop table t1;
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create table t1 (a char(3) binary, b binary(3));
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insert into t1 values ('aaa','bbb'),('AAA','BBB');
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select upper(a),upper(b) from t1;
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upper(a) upper(b)
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AAA bbb
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AAA BBB
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select lower(a),lower(b) from t1;
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lower(a) lower(b)
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aaa bbb
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aaa BBB
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select * from t1 where upper(a)='AAA';
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a b
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aaa bbb
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AAA BBB
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select * from t1 where lower(a)='aaa';
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a b
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aaa bbb
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AAA BBB
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select * from t1 where upper(b)='BBB';
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a b
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AAA BBB
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select * from t1 where lower(b)='bbb';
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a b
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aaa bbb
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select charset(a), charset(b), charset(binary 'ccc') from t1 limit 1;
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charset(a) charset(b) charset(binary 'ccc')
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latin1 binary binary
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select collation(a), collation(b), collation(binary 'ccc') from t1 limit 1;
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collation(a) collation(b) collation(binary 'ccc')
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latin1_bin binary binary
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drop table t1;
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create table t1( firstname char(20), lastname char(20));
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insert into t1 values ("john","doe"),("John","Doe");
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select * from t1 where firstname='john' and firstname like binary 'john';
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firstname lastname
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john doe
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select * from t1 where firstname='john' and binary 'john' = firstname;
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firstname lastname
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john doe
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select * from t1 where firstname='john' and firstname = binary 'john';
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firstname lastname
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john doe
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select * from t1 where firstname='John' and firstname like binary 'john';
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firstname lastname
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john doe
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select * from t1 where firstname='john' and firstname like binary 'John';
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firstname lastname
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John Doe
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drop table t1;
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create table t1 (a binary);
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show create table t1;
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Table Create Table
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t1 CREATE TABLE `t1` (
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`a` binary(1) DEFAULT NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
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drop table t1;
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create table t1 (col1 binary(4));
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insert into t1 values ('a'),('a ');
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select hex(col1) from t1;
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hex(col1)
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61000000
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61200000
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alter table t1 modify col1 binary(10);
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select hex(col1) from t1;
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hex(col1)
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61000000000000000000
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61200000000000000000
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insert into t1 values ('b'),('b ');
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select hex(col1) from t1;
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hex(col1)
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61000000000000000000
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61200000000000000000
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62000000000000000000
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62200000000000000000
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drop table t1;
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CREATE TABLE t1 (
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a binary(20) NOT NULL DEFAULT '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0',
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index idx(a)
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);
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INSERT INTO t1 SET a=unhex('1F9480179366F2BF567E1C4B964C1EF029087575');
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INSERT INTO t1 SET a=unhex('1F9480179366F2BF567E1C4B964C1EF029082020');
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INSERT INTO t1 SET a=unhex('1F9480179366F2BF567E1C4B964C1EF029080707');
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SELECT hex(a) FROM t1 order by a;
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hex(a)
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1F9480179366F2BF567E1C4B964C1EF029080707
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1F9480179366F2BF567E1C4B964C1EF029082020
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1F9480179366F2BF567E1C4B964C1EF029087575
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EXPLAIN SELECT hex(a) FROM t1 order by a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL idx 20 NULL 3 Using index
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SELECT hex(a) from t1 WHERE a=unhex('1F9480179366F2BF567E1C4B964C1EF029082020');
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hex(a)
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1F9480179366F2BF567E1C4B964C1EF029082020
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EXPLAIN
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SELECT hex(a) from t1 WHERE a=unhex('1F9480179366F2BF567E1C4B964C1EF029082020');
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ref idx idx 20 const 1 Using where; Using index
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SELECT hex(a) from t1 WHERE a=unhex('1F9480179366F2BF567E1C4B964C1EF02908');
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hex(a)
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DROP TABLE t1;
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CREATE TABLE t1 (
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id numeric(20) NOT NULL,
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lang varchar(8) NOT NULL,
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msg varchar(32) NOT NULL,
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PRIMARY KEY (id,lang)
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);
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INSERT INTO t1 VALUES (33, 'en', 'zzzzzzz');
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INSERT INTO t1 VALUES (31, 'en', 'xxxxxxx');
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INSERT INTO t1 VALUES (32, 'en', 'yyyyyyy');
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SELECT * FROM t1 WHERE id=32;
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id lang msg
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32 en yyyyyyy
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DROP TABLE t1;
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