SQL CAST或轉換功能

Question

嗨，我是新來的SQL，需要以下投聲明將從varchar(255)到decimal(6,2)我試過很多選擇，但不能達到它

case when [ A 2 cost] = ' £- ' then '0' else [ A 2 cost] end as Costing 

的[A 2 Cost]在目的地的結果decimal(6,2)數據類型，但在源是varchar(255)

Answer 1

試試這個

case when [ A 2 cost] = ' £- ' 
then 0.0 else cast([ A 2 cost] as decimal(5,2)) end as Costing 

如果其他列包含在開始£你需要清潔：

case when [ A 2 cost] = ' £- ' 
then 0.0 else cast(REPLACE([ A 2 cost],'£','') as decimal(5,2)) end as Costing