来自前一列的Concat

Question

我有没有办法从逻辑确定的前一列中连接一列？

    
    select
    if(p.mfg is not null , p.mfg, 'Private') as MFG,
    concat(MFG, " ",p.sku) as TITLE
    from product p

Answer 1

您可以使用{/ 1}}语句，例如

CASE

（OR）使用select if(p.mfg is not null , p.mfg, 'Private') as MFG, concat(case when p.mfg is not null then p.mfg else 'Private' end, " ",p.sku) as TITLE from product p 之类的

inline view