如何将nvarchar数据类型转换为数字

Question

I need to convert an nvarchar datatype to numeric since it's giving me an error when I tried to convert it this way.

   cast(memberid as numeric(10,0) as memberid

would this work the same way?

   case when ISNUMERIC(memberid) = 1 then cast(memberid as numeric(10,0)) else NULL end As memberid

any help would be appreciated!! Thanks!

Answer 1

In Sql Server 2012+ use: try_convert(numeric(10,0),memberid)

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In Sql Server 2012 and up: each of these will return null when the conversion fails instead of an error.

• try_convert(datatype,val)
• try_cast(val as datatype)
• try_parse(val as datatype [using culture])
• Why doesn't isnumeric() work correctly? (SQL Spackle)