Usage of INSTR function in mysql

Usage of INSTR function in mysql
INSTR(field name, string)

This function returns the position of the string in the content of a field, returns 0 if the string is not found, otherwise returns the position (starting from 1)

SELECT * FROM tblTopic ORDER BY INSTR( topicTitle, 'ha' ) > 0 DESC

SELECT INSTR( topicTitle, 'ha' ) FROM tblTopic



MySQL uses instr and IN sorting to sort

the instr result as a column

select id,1 from world_guide where id = 32
union
select * from
(select id, instr('30,35,31,',id+',') as d from
world_blog where id in (30,35,31) order by d) as t;
output

+----+ ---+
| id | 1 |
+----+---+
| 32 | 1 |
| 30 | 1 |
| 35 | 4 |
| 31 | 7 |
+----+---+
4 rows in set, 6 warnings (0.02 sec)




Table A 
Field: name name
  Zhang Sanwang
  five
Form B
field: title title 
  information one three publishing
  information two king five publishing
  information three three three publishing

rankings , according to the name of table A like %'name'% to match the title of table B Sort by number,

ranking example

Zhang San 2
Wang Wu 1

select name,count(b.title) from a inner join b on instr(b.title,a.name)>0
group by name
order by count(b.title )

select name,(select count(*) from table B where instr(title, table A.name)
from table A
order by 2 desc

from: http://blog.csdn.net/zyyr365/article/details/5603555