SQL: simple custom column in select doesn't work? [closed] - sql

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If I add custom column in select, I get this error:
20018 Invalid column name '2'.
Here is query example
SELECT
[msg].[MessageTo],
[msg].[MessageFrom],
[msg].[SendTime],
[msg].[ReceiveTime],
[msg].[id],
'2' AS source,
[kat].[id] AS [CategoriId],
[kat].[naziv] AS [CategoriName]
FROM
[SMSServer_1].[dbo].[MessageIn] AS [msg]
LEFT JOIN [Tekijanka].[dbo].[crm_poruka] AS [por] ON [por].[fk_poruka] = [msg].[id]
AND [por].[fk_source] = [2]
LEFT JOIN [Tekijanka].[dbo].[crm_kategorije_poruka] AS [kat] ON [kat].[id] = [por].[fk_kategorija]
WHERE
msg.id NOT IN (
SELECT
fk_poruka
FROM
Tekijanka.dbo.crm_poruka
WHERE
fk_status <> 1
)
ORDER BY
[SendTime] DESC
Is there any way to fix it?

Answer 1

The problem is in LEFT JOIN, not in the SELECT section:
AND [por].[fk_source] = [2]
This condition tries to join fk_source and column named [2]. Of course, there's no such column in tables MessageIn and crm_poruka. You have to change this part of the code (remove the condition or change it to AND [por].[fk_source] = 2).