sqlite：有没有办法在SELECT子句中产生条件OR / COALESCE？

Question

我有以下观点：

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其中TitleSP或TitleEN为空的记录。在这种情况下，我只想包含不为null的任何列，并且不包含“ /”。

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

Answer 1

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, 
...