In my situation, I was comparing table schema column count for 2 identical tables in 2 databases; one is the main database and the other is the archival database. I did this (SQL 2012+):
DECLARE @colCount1 INT;
DECLARE @colCount2 INT;
SELECT @colCount1 = COUNT(COLUMN_NAME) FROM MainDB.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'SomeTable';
SELECT @colCount2 = COUNT(COLUMN_NAME) FROM ArchiveDB.INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'SomeTable';
IF (@colCount1 != @colCount2) THROW 5000, 'Number of columns in both tables are not equal. The archive schema may need to be updated.', 16;
The important thing to notice here is qualifying the database name before INFORMATION_SCHEMA (which is a schema, like dbo). This will allow the code to break, in case columns were added to the main database and not to the archival database, in which if the procedure were allowed to run, data loss would almost certainly occur.