[英]Concat from a previous column
我有辦法從邏輯確定的前一列中合並一列嗎?
select
if(p.mfg is not null , p.mfg, 'Private') as MFG,
concat(MFG, " ",p.sku) as TITLE
from product p
您可以使用CASE
語句,例如
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
(OR)使用inline view
select MFG, concat(MFG, " ", sku) as TITLE
from (select if(p.mfg is not null , p.mfg, 'Private') as MFG, sku from product p
) tab
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