In SQL, how do I convert the data type nvarchar to float?

Convert nvarchar to decimal and then float, e.g

declare @vnum varchar(20)

declare @fnum float

set @fnum=convert(decimal(18,2),''--nvarchar to float

set @vnum=convert(varchar(20),'%'--float to nvarchar

set @fnum=cast('' as decimal(20,2))

set @vnum=cast( as varchar(20))+'%'

printprint @vnum

1.Directly change the field type to float

statement, you can convert a field to a float. For example, select cast(price as float) from table

The problem is not difficult, but it is a bit complicated, first export the table, import it into Excel, use the Excel data format to make it into a float in Excel, and then import it into SQL, and it's OK!

How did you turn it? What's wrong? Post it out.

SQL data type conversion:

convert(float,'')

Let's get the whole SQL statement out, including the table name, conditions or something, it may not be this part of the error.

Check if [Issuer (t011)] can be converted to float:

select [****(t002)] as ****,convert(float,[issuer(t011)])as issuer.

into ** from [100000004]where isnumeric ([issuer(t011)]) = 1

The function is being used incorrectly.

str is to return character data converted from numeric data. And you're declaring nvarchar, and the arguments you pass in are'41e620ee-b34c-499c-b0e6-fc454583e63f'I think you mean you want to convert it into character data.

Replace str(@startnum) with cast (@channelid as nvarchar).

create table #(f float, i int)

declare @f float, @i int, @sql nvarchar(1000)

select @f = , i = 13

set @sql = 'insert into # values(@f, '+convert(varchar,@i)+')'

exec sp_executesql @sql, n'@f float', @f

select * from #*f i

13*/drop table #

You can use cast or automatically convert by default within the system:

declare @i nvarchar(20), num decimal(10,4)

set @i=''

set @num=@i

select @num

set @num=cast(@i as decimal(10,4))select @num

cast(nvarchar variable or field as decimal(19,2)).

or convert(decimal(19,2), nvarchar variable or field).

- Provided that the data in nvarchar is in a legitimate digital format, otherwise the conversion will be wrong.

You can find the changes that prevent saving the table from being saved next to Options - Designers, or you can change it with a SQL statement.

alter table tablenamealter column cname float

There are no punctuation marks.

Or what about special characters?

I guess you may have inserted a space in field A, and you try to go down to the space and query it again.

select * from the table where isnumeric(ltrim(rtrim(a)))0

What is the value given to the id value when it is written? If there is no value, the @content will be null, and the plcid will always be 1.

This logic is a bit dizzy, what field auto-increment is to be achieved?

SQL error converting from data type varchar to float.

You can use where isnumeric (column 7) = 0 to see what can't be converted to a number.

If it's an arithmetic overflow, that can amplify the number of digits of decimal.