SQL CAST或转换函数

Question

您好我是SQL的新手，需要将以下演员语句从varchar(255)转换为decimal(6,2)我尝试了很多选项但无法实现

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

目标中[A 2 Cost]的结果为decimal(6,2)数据类型，但在源代码中为varchar(255)

Answer 1

试试这个

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

如果其他列在开头包含£，则需要清除它：

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