SQL搜索查询多个Where子句，例如，名字和姓氏

Question

I have a SQL Search Query which works if I search on the First Name or the Surname:

SELECT     MemberID, FirstName, Surname, Title + ' ' + FirstName + ' ' + Surname AS FullName
FROM         Members
WHERE FirstName + Surname LIKE N'%' + 'Smith' + '%'
ORDER BY FullName

If I search for John I see all John's if I search for Smith I see all Smith's What I would like is to search for John Smith and see all John Smith's . Thanks

UPDATE: I should have made my original post clearer. I am using vb.net and when the user enters a search term into a text box the actual query that is run is as follows:

SELECT     MemberID, FirstName, Surname, Title + ' ' + FirstName + ' ' + Surname AS FullName
FROM         Members
WHERE FirstName + Surname LIKE N'%' + @SearchTerm + '%'
ORDER BY FullName

I want the user to be able to type: John S and see all users called John with a Surname of S.

Answer 1

SELECT     MemberID, FirstName, Surname, Title + ' ' + FirstName + ' ' + Surname AS FullName
FROM         Members
WHERE FirstName LIKE '%john%'
AND Surname LIKE '%smith%'
ORDER BY FullName;

Answer 2

Based on the caveats and conditions in your comments on other questions, your best bet is going to be have two search boxes (firstname and surname) and build a query that looks something like this.

SELECT   MemberID, FirstName, Surname, Title + ' ' + FirstName + ' ' + Surname AS FullName
FROM         Members
WHERE FirstName like N'%' + @SearchFirst + '%' AND
      Surname LIKE N'%' + @SearchSurname + '%'
ORDER BY FullName

Alternatively you could try to manually parse a single search box into first and last name before inserting the values into your query. But parsing names is a very dicey affair not entered into lightly.

Answer 3

SELECT     MemberID, FirstName, Surname, Title + ' ' + FirstName + ' ' + Surname AS FullName
FROM         Members
WHERE FirstName + Surname LIKE N'%' + 'Smith' + '%'
ORDER BY FullName

Okie, I'mma try to take a crack at this. Assuming that you want to search for last and first name.

SELECT     MemberID, FirstName, Surname, Title + ' ' + FirstName + ' ' + Surname AS FullName
FROM         Members
WHERE FirstName='John' AND Surname='Smith'
ORDER BY FullName

Would this work?

Answer 4

SELECT     MemberID, FirstName, Surname, Title + ' ' + FirstName + ' ' + Surname AS FullName
FROM         Members
WHERE FirstName + ' ' + Surname LIKE N'%' + SearchTerm + '%'
ORDER BY FirstName

Here SearchTerm could be any John Smith, Or John S, Or John, Or simply J

Answer 5

Unless you have data like this:

     Firstname              |  Lastname
     John Stewart           |  Mill

your query above with Searchterm = '%John M%' will find all the Johns whose surname begins with M, provided that you concatenate a space:

           where firstname + ' ' + lastname like '%John S%'

However you won't get great performance with CONTAINS-SUBSTRING type queries (ie wildcard on either side of the search term). Starts-with queries can make use of an index, so it would better to write:

     where firstname = 'John'    -- can use an index on firstname column
     and lastname like 'S%'      -- can use an index on lastname column