网页搜索功能 多表搜索sql

SELECT ID, Title, FromTable
FROM (SELECT ID, ArticleName AS Title, 'Article' AS FromTable
        FROM Article AS A
        UNION ALL
        SELECT ID, VideoName AS Title, 'Video' AS FromTable
        FROM Video AS V
        UNION ALL
        SELECT ID, DownloadName AS Title, 'Download' AS FromTable
        FROM Download AS D) AS T
WHERE (Title LIKE '%q%')