Oracle中Like与Instr模糊查询性能大比拼

instr(title,'手册')>0 相当于 title like '%手册%' 
instr(title,'手册')=1 相当于 title like '手册%' 
instr(title,'手册')=0 相当于 title not like '%手册%'  

SQL> set timing on 
SQL> select count() from t where instr(title,'手册')>0; 
 COUNT() 
---------- 
   65881 
Elapsed: 00:00:11.04 
SQL> select count() from t where title like '%手册%'; 
 COUNT() 
---------- 
   65881 
Elapsed: 00:00:31.47 
SQL> select count() from t where instr(title,'手册')=0; 
 COUNT() 
---------- 
 11554580 
Elapsed: 00:00:11.31 
SQL> select count() from t where title not like '%手册%'; 
 COUNT() 
---------- 
 11554580 

instr(title,'aaa')>0 相当于like 
instr(title,'aaa')=0 相当于not like 

 select  id, name from users where instr('101914, 104703', id) > 0;  

select  id, name from users where id = 101914 or id = 104703; 

select  from tb where name like '%XX%'; 
select  from tb where instr(name,'XX')>0;  

create index idx_tb_name on tb(name);  

select  from tb where instr(name,'XX')>0;