SQL Collation conflict when comparing to a column in a temp table

Question

I have a SQL query that compares a value in the database to a constant:

SELECT * FROM my_table
INNER JOIN #TempTable tem
    ON my_table.id = temp.id
    AND         


        

Answer 1

The problem is the temp table. It uses the collation of the tempdb.

You could create a table in your actual db and not a temp table and then they would have the same collation. Or specify collation upon creating temp table.

Answer 2

Seems your id's are VARCHARs with different collations.

Try this:

SELECT  *
FROM    my_table
INNER JOIN
        #TempTable tem
ON      my_table.id = temp.id COLLATE SQL_Latin1_General_CP1_CI_AS
        AND my_table.key = 'SOME STRING'

Answer 3

try

SELECT * FROM my_table
INNER JOIN #TempTable temp    
    ON my_table.id = temp.id collate database_default
    AND my_table.key = 'SOME STRING'

Answer 4

Specify the collation inside the declaration of your temp table.

CREATE TABLE #TempTable (ID NVARCHAR(255) COLLATE database_default)