1
by brian
clean slate |
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drop table if exists t1,t2,t3,t4;
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set @save_storage_engine= @@storage_engine;
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set storage_engine=InnoDB;
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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)
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) ENGINE=InnoDB 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-1014=w filler
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c-1015=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-1014=w filler-1
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c-1015=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-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-1014=w filler
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c-1015=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-1014=w filler-1
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c-1015=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-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-1014=w filler
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c-1015=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-1014=w filler-1
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c-1015=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-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-1014=w filler
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c-1015=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-1014=w filler-1
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c-1015=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-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-1014=w filler
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c-1015=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-1014=w filler-1
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c-1015=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-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 16 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 32 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 storage_engine= @save_storage_engine;
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drop table t1, t2, t3, t4;
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set @read_rnd_buffer_size_save= @@read_rnd_buffer_size;
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set read_rnd_buffer_size=64;
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create table t1(a int);
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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 char(8), b char(8), c char(8), filler char(100), key(a,b,c) ) engine=InnoDB;
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insert into t2 select
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concat('a-', 1000 + A.a, '-a'),
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concat('b-', 1000 + B.a, '-b'),
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concat('c-', 1000 + C.a, '-c'),
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'filler'
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from t1 A, t1 B, t1 C;
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explain
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select count(length(a) + length(filler)) from t2 where a>='a-1000-a' and a <'a-1001-a';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range a a 9 NULL 99 Using index condition; Using MRR
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select count(length(a) + length(filler)) from t2 where a>='a-1000-a' and a <'a-1001-a';
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count(length(a) + length(filler))
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292 |
100
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drop table t2;
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create table t2 (a char(100), b char(100), c char(100), d int,
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filler char(10), key(d), primary key (a,b,c)) engine= innodb;
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insert into t2 select A.a, B.a, B.a, A.a, 'filler' from t1 A, t1 B;
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explain select * from t2 force index (d) where d < 10;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t2 range d d 5 NULL 47 Using index condition; Using MRR
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drop table t2;
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drop table t1;
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set @@read_rnd_buffer_size= @read_rnd_buffer_size_save;
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create table t1 (f1 int not null, f2 int not null,f3 int not null, f4 char(1), primary key (f1,f2), key ix(f3))Engine=InnoDB;
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select * from t1 where (f3>=5 and f3<=10) or (f3>=1 and f3<=4);
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f1 f2 f3 f4
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306 |
1 1 1 A
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2 2 2 A
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3 3 3 A
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4 4 4 A
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5 5 5 A
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6 6 6 A
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7 7 7 A
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8 8 8 A
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9 9 9 A
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10 10 10 A
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316 |
drop table t1;
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