Inserting special characters (greater/less than or equal symbol) into SQL Server database

StackOverflow https://stackoverflow.com/questions/12028594

  •  27-06-2021
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Question

I am trying to insert ≤ and ≥ into a symbol table where the column is of type nvarchar.

Is this possible or are these symbols not allowed in SQL Server?

Was it helpful?

Solution

To make it work, prefix the string with N

create table symboltable 
(
  val nvarchar(10)
)

insert into symboltable values(N'≥') 

select *
from symboltable

enter image description here

Further Reading:

OTHER TIPS

To add to gonzalo's answer, both the string literal and the field need to support unicode characters.

String Literal

Per Marc Gravell's answer on What does N' stands for in a SQL script ?:

'abcd' is a literal for a [var]char string, occupying 4 bytes memory, and using whatever code-page the SQL server is configured for.
N'abcd' is a literal for a n[var]char string, occupying 8 bytes of memory, and using UTF-16.

Where the N prefix stands for "National" Language in the SQL-92 standard and is used for representing unicode characters. For example, in the following code, any unicode characters in the basic string literal are first encoded into SQL Server's "code page":

<code>SELECT '≤' AS ['≤'], N'≤' AS [N'≤']</code>

Aside: You can check your code page with the following SQL: 

SELECT DATABASEPROPERTYEX('dbName', 'Collation') AS dbCollation;
SELECT COLLATIONPROPERTY( 'SQL_Latin1_General_CP1_CI_AS' , 'CodePage' ) AS [CodePage];

The default is Windows-1252 which only contains these 256 characters

Field Type

Once the values are capable of being passed, they'll also need to be capable of being stored into a column that supports unicode types, for example:

  • nchar
  • nvarchar
  • ntext

Further Reading:

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