- #Sql studio error changing column from nvarchar to decimal how to#
- #Sql studio error changing column from nvarchar to decimal code#
The real question here is why you're storing numeric values in an nvarchar column. Select case when columnname = '' then null else cast(columnname as decimal(18, 2)) end cast_value Notice that the DataType of the Salary column is nvarchar. Right-click on the table tblManager then click on the Design option. Step 1: Now one way to do that is within the Object Explorer. Here's one example that codes it to a NULL. So we need to change the DataType of this column from nvarchar to integer.
#Sql studio error changing column from nvarchar to decimal code#
You can code it to any decimal (18, 2) value.
#Sql studio error changing column from nvarchar to decimal how to#
If you want to convert the strings of numbers to actual numbers, the NULLs will take care of themselves, but you're going to have to decide how to handle the empty strings and then allow for it. My guess is this is why you have the ROUND function in there to begin with. Select round(columnname, 2), CAST(round(columnname,2) AS decimal(18,2)) as cast_value Insert into #temp(columnname) values('234.56') Insert into #temp(columnname) values('') For example, I have Following table You may notice that UnitPrice has nvarchar datatype. Insert into #temp(columnname) values(null) In SQL, convert nvarchar (string) to number can be achieve by using cast and convert SQL function. Insert into #temp(columnname) values('123.45')
Note the readily-consumable DDL that can you can copy/paste. The ROUND function is what's doing the conversion. Select CAST(round(column,2) AS decimal(18,2)) as columnĪll goes well, but the empty and NULL values appear as 0.00 value but i want them to stay emptyĬan anyone help me on this, how to achieve this. There is an 'Improve' button just under your question, please use it, and qualify your question with relevant code. Now when i try to convert the values with: The nvarchar column has empty records as well as NULL values. This must be less than or equal to 16.I am trying to convert a nvarchar column to a decimal value. The third argument is the number of places to the right of the decimal point. This includes decimal point, sign, digits, and spaces. The first argument is an expression of float data type with a decimal point. The character data is right-justified, with a specified length and decimal precision. This function returns character data converted from numeric data. The STR() FunctionĪnother way to format a number to two decimal places is to use the STR() function: SELECT STR(275, 6, 2) Therefore, it can be used to add two decimal places to an integer (as seen in the above example). The # format specifier suppresses any insignificant zeros while the 0 format specifier does not.īut perhaps more importantly (for the purposes of this article), the 0 format specifier allows you to add insignificant zeros if they aren’t present in the original number. We can see that there’s a difference between using # and 0 in the format string.
Here’s an example of using custom format strings: SELECT Custom format strings allow you to specify a format that might not be supported by a standard format string. It’s been rounded up, just like when we converted the number in the other example.Īnother way to do it is to use a custom format string. The same technique can be used to reduce the decimal places to two, from a number with more decimal places: SELECT FORMAT(275.4567, 'N2') In this case, N is for number and 2 is for the number of decimal places (you can increase or decrease this as required). The N2 part is referred to as a format string. this line is causing problem you need to Convert dutyrate to decimal from nvarchar ('DutyRate', Convert.ToDecimal(txtDutyRate. This function actually converts the number to a string, so technically, the result is not a numeric type. Here, we use CONVERT() to do the same thing – convert the number to decimal: SELECT CONVERT(DECIMAL(5, 2), 275) Īnother way to format a number with two decimal places is to use the FORMAT() function: SELECT FORMAT(275, 'N2') One thing to remember though, is if you’re reducing the number of decimal places from a number with more than two decimal places, then you could end up with the second decimal place being rounded up: SELECT CAST(275.4567 AS DECIMAL(5, 2)) We can use this method even if the number is already a decimal value but with more decimal places. Here’s an example of using CAST(): SELECT CAST(275 AS DECIMAL(5, 2)) Two functions that can do this for us is CAST() and CONVERT(). The most obvious way to do it is to convert the number to a decimal type. When using T-SQL with SQL Server, we can format numbers using various methods, depending on our desired format.īelow are four functions that can be used to format a number to two decimal places in SQL Server.
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