sqlite多表关联

   记录一下sqlite中多表查询。

   表1：品牌：brands( brandid vARCHAR(20),

                      brand VARCHAR(20),

                      remark vARCHAR(100))

   表2：类型：types( typeid vARCHAR(20),

                       typeVARCHAR(20),

                      remark vARCHAR(100))

   表3：品牌：levels( levelid vARCHAR(20),

                       levelVARCHAR(20),

                      remark vARCHAR(100))

   表4：油品：oils( oilid vARCHAR(20),brandid VARCHAR(20),typeidvARCHAR(20),levelid vARCHAR(20),remark vARCHAR(100))

   说明一下：前三个表为基本信息，即油品的品牌、类型、级别，表4为油品信息，那么该如何显示油品的基本信息呢？

select brands.brand,types.type,levels.level fromoils
     inner join brands on oils.brandid = brands.brandid
     inner join types  on oils.typeid=types.typeid
     inner join levels on oils.levelid =levels.levelid