1
by brian
clean slate |
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drop table if exists t1, t2, t3; |
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set @read_rnd_buffer_size_save= @@read_rnd_buffer_size; |
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set read_rnd_buffer_size=79; |
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select @@read_rnd_buffer_size; |
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@@read_rnd_buffer_size
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79
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create table t1(a int); |
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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` int(11) DEFAULT NULL |
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) ENGINE=MyISAM DEFAULT CHARSET=latin1 |
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insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); |
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create table t2(a int); |
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insert into t2 select A.a + 10*(B.a + 10*C.a) from t1 A, t1 B, t1 C; |
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create table t3 ( |
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a char(8) not null, b char(8) not null, filler char(200), |
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key(a) |
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);
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insert into t3 select @a:=concat('c-', 1000+ A.a, '=w'), @a, 'filler' from t2 A; |
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insert into t3 select concat('c-', 1000+A.a, '=w'), concat('c-', 2000+A.a, '=w'), |
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'filler-1' from t2 A; |
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insert into t3 select concat('c-', 1000+A.a, '=w'), concat('c-', 3000+A.a, '=w'), |
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'filler-2' from t2 A; |
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select a,filler from t3 where a >= 'c-9011=w'; |
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a filler |
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select a,filler from t3 where a >= 'c-1011=w' and a <= 'c-1015=w'; |
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a filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1011=w filler-1 |
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c-1012=w filler-1 |
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c-1013=w filler-1 |
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c-1011=w filler-2 |
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c-1012=w filler-2 |
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c-1013=w filler-2 |
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c-1014=w filler |
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c-1015=w filler |
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c-1014=w filler-1 |
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c-1015=w filler-1 |
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c-1014=w filler-2 |
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c-1015=w filler-2 |
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select a,filler from t3 where (a>='c-1011=w' and a <= 'c-1013=w') or |
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(a>='c-1014=w' and a <= 'c-1015=w'); |
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a filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1011=w filler-1 |
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c-1012=w filler-1 |
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c-1013=w filler-1 |
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c-1011=w filler-2 |
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c-1012=w filler-2 |
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c-1013=w filler-2 |
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c-1014=w filler |
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c-1015=w filler |
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c-1014=w filler-1 |
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c-1015=w filler-1 |
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c-1014=w filler-2 |
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c-1015=w filler-2 |
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insert into t3 values ('c-1013=z', 'c-1013=z', 'err'); |
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insert into t3 values ('a-1014=w', 'a-1014=w', 'err'); |
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select a,filler from t3 where (a>='c-1011=w' and a <= 'c-1013=w') or |
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(a>='c-1014=w' and a <= 'c-1015=w'); |
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a filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1011=w filler-1 |
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c-1012=w filler-1 |
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c-1013=w filler-1 |
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c-1011=w filler-2 |
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c-1012=w filler-2 |
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c-1013=w filler-2 |
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c-1014=w filler |
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c-1015=w filler |
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c-1014=w filler-1 |
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c-1015=w filler-1 |
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c-1014=w filler-2 |
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c-1015=w filler-2 |
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delete from t3 where b in ('c-1013=z', 'a-1014=w'); |
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select a,filler from t3 where a='c-1011=w' or a='c-1012=w' or a='c-1013=w' or |
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a='c-1014=w' or a='c-1015=w'; |
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a filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1011=w filler-1 |
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c-1012=w filler-1 |
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c-1013=w filler-1 |
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c-1011=w filler-2 |
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c-1012=w filler-2 |
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c-1013=w filler-2 |
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c-1014=w filler |
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c-1015=w filler |
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c-1014=w filler-1 |
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c-1015=w filler-1 |
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c-1014=w filler-2 |
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c-1015=w filler-2 |
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insert into t3 values ('c-1013=w', 'del-me', 'inserted'); |
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select a,filler from t3 where a='c-1011=w' or a='c-1012=w' or a='c-1013=w' or |
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a='c-1014=w' or a='c-1015=w'; |
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a filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1011=w filler-1 |
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c-1012=w filler-1 |
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c-1013=w filler-1 |
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c-1011=w filler-2 |
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c-1012=w filler-2 |
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c-1013=w filler-2 |
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c-1014=w filler |
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c-1015=w filler |
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c-1014=w filler-1 |
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c-1015=w filler-1 |
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c-1014=w filler-2 |
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c-1015=w filler-2 |
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c-1013=w inserted |
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delete from t3 where b='del-me'; |
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alter table t3 add primary key(b); |
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select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1018=w') or |
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b IN ('c-1019=w', 'c-1020=w', 'c-1021=w', |
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'c-1022=w', 'c-1023=w', 'c-1024=w'); |
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b filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1014=w filler |
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c-1015=w filler |
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c-1016=w filler |
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c-1017=w filler |
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c-1018=w filler |
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c-1019=w filler |
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c-1020=w filler |
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c-1021=w filler |
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c-1022=w filler |
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c-1023=w filler |
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c-1024=w filler |
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select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1020=w') or |
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b IN ('c-1021=w', 'c-1022=w', 'c-1023=w'); |
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b filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1014=w filler |
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c-1015=w filler |
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c-1016=w filler |
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c-1017=w filler |
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c-1018=w filler |
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c-1019=w filler |
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c-1020=w filler |
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c-1021=w filler |
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c-1022=w filler |
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c-1023=w filler |
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select b,filler from t3 where (b>='c-1011=w' and b<= 'c-1018=w') or |
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b IN ('c-1019=w', 'c-1020=w') or |
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(b>='c-1021=w' and b<= 'c-1023=w'); |
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b filler |
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c-1011=w filler |
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c-1012=w filler |
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c-1013=w filler |
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c-1014=w filler |
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c-1015=w filler |
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c-1016=w filler |
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c-1017=w filler |
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c-1018=w filler |
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c-1019=w filler |
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c-1020=w filler |
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c-1021=w filler |
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c-1022=w filler |
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c-1023=w filler |
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create table t4 (a varchar(10), b int, c char(10), filler char(200), |
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key idx1 (a, b, c)); |
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insert into t4 (filler) select concat('NULL-', 15-a) from t2 order by a limit 15; |
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insert into t4 (a,b,c,filler) |
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select 'b-1',NULL,'c-1', concat('NULL-', 15-a) from t2 order by a limit 15; |
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insert into t4 (a,b,c,filler) |
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select 'b-1',NULL,'c-222', concat('NULL-', 15-a) from t2 order by a limit 15; |
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insert into t4 (a,b,c,filler) |
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select 'bb-1',NULL,'cc-2', concat('NULL-', 15-a) from t2 order by a limit 15; |
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insert into t4 (a,b,c,filler) |
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select 'zz-1',NULL,'cc-2', 'filler-data' from t2 order by a limit 500; |
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explain
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select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1' |
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or c='no-such-row2'); |
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id select_type table type possible_keys key key_len ref rows Extra |
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1 SIMPLE t4 range idx1 idx1 29 NULL 10 Using index condition; Using MRR |
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select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1' |
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or c='no-such-row2'); |
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a b c filler |
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NULL NULL NULL NULL-15 |
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NULL NULL NULL NULL-14 |
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NULL NULL NULL NULL-13 |
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NULL NULL NULL NULL-12 |
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NULL NULL NULL NULL-11 |
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NULL NULL NULL NULL-10 |
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NULL NULL NULL NULL-9 |
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NULL NULL NULL NULL-8 |
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NULL NULL NULL NULL-7 |
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NULL NULL NULL NULL-6 |
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NULL NULL NULL NULL-5 |
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NULL NULL NULL NULL-4 |
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NULL NULL NULL NULL-3 |
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NULL NULL NULL NULL-2 |
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NULL NULL NULL NULL-1 |
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explain
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select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2'); |
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id select_type table type possible_keys key key_len ref rows Extra |
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1 SIMPLE t4 range idx1 idx1 29 NULL 21 Using index condition; Using MRR |
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select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2'); |
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a b c filler |
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b-1 NULL c-1 NULL-15 |
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b-1 NULL c-1 NULL-14 |
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b-1 NULL c-1 NULL-13 |
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b-1 NULL c-1 NULL-12 |
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b-1 NULL c-1 NULL-11 |
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b-1 NULL c-1 NULL-10 |
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b-1 NULL c-1 NULL-9 |
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b-1 NULL c-1 NULL-8 |
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b-1 NULL c-1 NULL-7 |
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b-1 NULL c-1 NULL-6 |
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b-1 NULL c-1 NULL-5 |
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b-1 NULL c-1 NULL-4 |
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b-1 NULL c-1 NULL-3 |
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b-1 NULL c-1 NULL-2 |
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b-1 NULL c-1 NULL-1 |
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bb-1 NULL cc-2 NULL-15 |
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bb-1 NULL cc-2 NULL-14 |
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bb-1 NULL cc-2 NULL-13 |
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bb-1 NULL cc-2 NULL-12 |
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bb-1 NULL cc-2 NULL-11 |
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bb-1 NULL cc-2 NULL-10 |
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bb-1 NULL cc-2 NULL-9 |
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bb-1 NULL cc-2 NULL-8 |
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bb-1 NULL cc-2 NULL-7 |
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bb-1 NULL cc-2 NULL-6 |
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bb-1 NULL cc-2 NULL-5 |
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bb-1 NULL cc-2 NULL-4 |
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bb-1 NULL cc-2 NULL-3 |
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bb-1 NULL cc-2 NULL-2 |
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bb-1 NULL cc-2 NULL-1 |
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select * from t4 ignore index(idx1) where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2'); |
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a b c filler |
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b-1 NULL c-1 NULL-15 |
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b-1 NULL c-1 NULL-14 |
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b-1 NULL c-1 NULL-13 |
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b-1 NULL c-1 NULL-12 |
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b-1 NULL c-1 NULL-11 |
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b-1 NULL c-1 NULL-10 |
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b-1 NULL c-1 NULL-9 |
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b-1 NULL c-1 NULL-8 |
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b-1 NULL c-1 NULL-7 |
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b-1 NULL c-1 NULL-6 |
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b-1 NULL c-1 NULL-5 |
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b-1 NULL c-1 NULL-4 |
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b-1 NULL c-1 NULL-3 |
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b-1 NULL c-1 NULL-2 |
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b-1 NULL c-1 NULL-1 |
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bb-1 NULL cc-2 NULL-15 |
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bb-1 NULL cc-2 NULL-14 |
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bb-1 NULL cc-2 NULL-13 |
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bb-1 NULL cc-2 NULL-12 |
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bb-1 NULL cc-2 NULL-11 |
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bb-1 NULL cc-2 NULL-10 |
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bb-1 NULL cc-2 NULL-9 |
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bb-1 NULL cc-2 NULL-8 |
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bb-1 NULL cc-2 NULL-7 |
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bb-1 NULL cc-2 NULL-6 |
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bb-1 NULL cc-2 NULL-5 |
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bb-1 NULL cc-2 NULL-4 |
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bb-1 NULL cc-2 NULL-3 |
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bb-1 NULL cc-2 NULL-2 |
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bb-1 NULL cc-2 NULL-1 |
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set @@read_rnd_buffer_size= @read_rnd_buffer_size_save; |
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drop table t1, t2, t3, t4; |
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278 |
CREATE TABLE t1 ( |
|
279 |
ID int(10) unsigned NOT NULL AUTO_INCREMENT, |
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280 |
col1 int(10) unsigned DEFAULT NULL, |
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key1 int(10) unsigned NOT NULL DEFAULT '0', |
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key2 int(10) unsigned DEFAULT NULL, |
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text1 text, |
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text2 text, |
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col2 smallint(6) DEFAULT '100', |
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col3 enum('headers','bodyandsubject') NOT NULL DEFAULT 'bodyandsubject', |
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col4 tinyint(3) unsigned NOT NULL DEFAULT '0', |
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PRIMARY KEY (ID), |
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KEY (key1), |
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KEY (key2) |
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) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=utf8; |
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INSERT INTO t1 VALUES |
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293 |
(1,NULL,1130,NULL,'Hello',NULL,100,'bodyandsubject',0), |
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294 |
(2,NULL,1130,NULL,'bye',NULL,100,'bodyandsubject',0), |
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(3,NULL,1130,NULL,'red',NULL,100,'bodyandsubject',0), |
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(4,NULL,1130,NULL,'yellow',NULL,100,'bodyandsubject',0), |
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(5,NULL,1130,NULL,'blue',NULL,100,'bodyandsubject',0); |
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select * FROM t1 WHERE key1=1130 AND col1 IS NULL ORDER BY text1; |
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ID col1 key1 key2 text1 text2 col2 col3 col4 |
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300 |
5 NULL 1130 NULL blue NULL 100 bodyandsubject 0 |
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2 NULL 1130 NULL bye NULL 100 bodyandsubject 0 |
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1 NULL 1130 NULL Hello NULL 100 bodyandsubject 0 |
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3 NULL 1130 NULL red NULL 100 bodyandsubject 0 |
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4 NULL 1130 NULL yellow NULL 100 bodyandsubject 0 |
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305 |
drop table t1; |