将数据类型 nvarchar(50) 转换为数值时出错

Question

I have a price column with the type of NVARCHAR(50) . Inside of this, I have data like 123,22 as a string and goes on. They are now string and I want to convert them to decimal(18,2) and I am trying to query this but giving me an error:

UPDATE reservations
SET price = CONVERT(NVARCHAR(50),CONVERT(decimal(18, 2), price,105))
ALTER TABLE reservations
ALTER COLUMN price decimal(18, 2)

Error converting data type nvarchar to numeric.

I have run this code before for the datetime and it worked but for decimal I am getting this error. Can anyone tell me the problem?

Answer 1

I think you should replace comma to dot . For example;

DECLARE @price AS NVARCHAR(50)=N'123,22'

SELECT TRY_CONVERT(decimal(18, 2), REPLACE(@price,',','.'),105)

If we change your query according to this approach;

UPDATE reservations
SET price= CONVERT(NVARCHAR(50),CONVERT(decimal(18, 2), REPLACE(price,',','.'),105))
ALTER TABLE reservations
ALTER COLUMN price decimal(18, 2)