Search query, 'order by' priority

问题

I need implement simple search in small content table: id, name, description, content. Results must be order by priorities

name
description
content

it's mean that if searched word was found in description field, it will be shown only after all rows that have dog in name field

What I did:

I tried create temp table with structure like table that I use but with another field priority. for each field, these I use for search, do insert select to temp table

Example:

  DECLARE @query NVARCHAR(255)


  CREATE TABLE #tbl_search
    (
      [id] INT NOT NULL ,
      [name] NVARCHAR(255) ,
      [description] NVARCHAR(MAX) ,
      [content] NVARCHAR(MAX) ,
      [priority] INT
    )    


    --searching in name field
  INSERT    INTO #tbl_search
            ( [ID] ,
              [name] ,
              [description] ,
              [content] ,
              [priority]

            )
            SELECT  [ID] ,
                    [name] ,
                    [description] ,
                    [content] ,
                    1
            FROM    [tbl_content]
            WHERE   name LIKE '%' + @query + '%'

    --searching in description field            
  INSERT    INTO #tbl_search
            ( [ID] ,
              [name] ,
              [description] ,
              [content] ,
              [priority]

            )
            SELECT  [ID] ,
                    [name] ,
                    [description] ,
                    [content] ,
                    2
            FROM    [tbl_content]
            WHERE   description LIKE '%' + @query + '%'
                    AND id NOT IN ( SELECT  id
                                    FROM    #tbl_search )
   --.....           

  SELECT    *
  FROM      #tbl_search
  ORDER BY  [priority]

  DROP TABLE #tbl_search

回答1:

One way of doing it would be using the CASE keyword:

SELECT name, description, content,
    priority = CASE
        WHEN name LIKE '%' + @query + '%' THEN 1
        WHEN desription LIKE '%' + @query + '%'  THEN 2
        WHEN content LIKE '%' + @query + '%'  THEN 3
    END CASE
FROM tbl_content
WHERE
    name LIKE '%' + @query + '%' OR
    desription LIKE '%' + @query + '%'  OR
    content LIKE '%' + @query + '%'
ORDER BY priority ASC

回答2:

The easiest way would be to use UNION query:

SELECT name AS text FROM tbl_content WHERE name LIKE '%' + @query + '%'
UNION
SELECT description AS text FROM tbl_content WHERE desription LIKE '%' + @query + '%'
UNION
SELECT content AS text FROM tbl_content WHERE content LIKE '%' + @query + '%'

回答3:

For sake of completeness, I move @Amirshk brilliant solution to the next level by using the case when in order clause (query for mysql):

SELECT name, description, content
FROM tbl_content
WHERE
    name LIKE '%' + @query + '%' OR
    desription LIKE '%' + @query + '%'  OR
    content LIKE '%' + @query + '%'
ORDER BY CASE
        WHEN name LIKE '%' + @query + '%' THEN 1
        WHEN desription LIKE '%' + @query + '%'  THEN 2
        WHEN content LIKE '%' + @query + '%'  THEN 3
    END

来源：https://stackoverflow.com/questions/2260909/search-query-order-by-priority

标签

sql-server

search-engine