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Editorial Team
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Asked: 2026-05-19T02:43:21+00:00

I have a table containing a field called ChannelId. I want to break it

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I have a table containing a field called ChannelId. I want to break it out into two fields depending on the value. I tried this:

SELECT CustomerId, ChannelId = 1 as Chan1, ChannelId = 2 as Chan2 FROM ....

The goal being that I have two boolean columns representing whether the ChannelId field is of the approriate value. I get a syntax error.

Looking at the SQL Syntax I can’t see any reason why I can’t use an expression and then alias it as a new column name, but SQL Server croaked on it. Am I doing something really dumb? How can I achieve this effect?

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1 Answer

  1. Editorial Team

    You have to perform an expression, not an assignment, and it depends on he flavor of SQL. Since you’re using SQL Server (T-SQL):

    SELECT CustomerId, (CASE WHEN ChannelId = 1 THEN 1 ELSE 0 END) as Chan1, (CASE WHEN ChannelId = 2 THEN 1 ELSE 0 END) as Chan2 FROM ....

    There might be a better way to do it, but that’s how I do it.

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