sqlite：有没有办法在SELECT子句中创建条件OR / COALESCE？

CREATE VIEW FilmTableView AS

    SELECT  (TitleSP || " / " || TitleEN) as Title,CompanyName,CoverURI,CompanyFilmRelation.CompanyId,CompanyFilmRelation.FilmId 

    FROM    Film
    JOIN    CompanyFilmRelation on CompanyFilmRelation.FilmId = Film.FilmId 
    JOIN    Company on CompanyFilmRelation.CompanyId = Company.CompanyId 

    ORDER BY Title;

但我最终可能会得到TitleSP或TitleEN为空的记录.在这种情况下,我只想包含哪个列不为null而不包含“/”.

有没有办法做到这一点？也就是说,遵循以下逻辑：

if(TitleSP && TitleEN)
   select (TitleSP || " / " || TitleEN) as Title
else
   select (TitleSP ? TitleSP : TitleEn) as Title

解决方法

SELECT CASE WHEN (TitleSP = '' OR TitleSP IS NULL)
                THEN COALESCE(TitleEN,'')
            WHEN (TitleEN = '' OR TitleEN IS NULL)
                THEN TitleSP
            ELSE (TitleSP || ' / ' || TitleEN)
       END AS Title,...

（编辑：李大同）

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