问题
Can someone explain this to me? I have two queries below with their results.
query:
select * from tbl where contains([name], '"*he*" AND "*ca*"')
result-set:
Hertz Car Rental
Hemingyway's Cantina
query:
select * from tbl where contains([name], '"*he*" AND "*ar*"')
result-set:
nothing
The first query is what I would expect, however I would expect the second query to return "Hertz Car Rental". Am I fundamentally misunderstanding how '*' works in full-text searching?
Thanks!
回答1:
I think SQL Server is interpreting your strings as prefix_terms. The asterisk is not a plain old wildcard specifier. Fulltext and Contains are word oriented. For what you are trying to do, you would be better off using plain old LIKE instead of CONTAINS.
http://msdn.microsoft.com/en-us/library/ms187787.aspx
回答2:
"*" only works as a suffix. If you use it as a prefix, the table needs to be scanned no matter what and the index is useless. At that point, you might as well do
Select * From Table Where (Name Like '%he%') And (Name Like '%ar%')
回答3:
I would try replacing * with % to see how it goes.
select * from tbl where contains([name], '"%he%" AND "%ar%"')
来源：https://stackoverflow.com/questions/6962270/sql-contains-question