SQL CAST 或转换函数

Question

嗨，我是 SQL 的新手，需要将以下 cast 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] 的结果是 decimal(6,2) 数据类型，但源中是 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

如果其他列的开头包含 £ 您需要清理它：

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

SQL CAST or Convert Function