Web Reference: Jul 3, 2015 · I'm having difficulty in pulling the userID from joining these two tables. My goal is to find all vacation balance over 200 and all active userID but I keep getting an ambiguous column name for userID. Oct 18, 2023 · In a query involving multiple tables through JOIN operations, referencing a column that exists in both tables without specifying the table or alias can cause the “ambiguous column name” error. Sep 30, 2024 · If you’re getting an error that reads “ Ambiguous column name “, followed by a column name, in SQL Server, it could be that you’re performing a join on two tables, but you’re not using the table names or aliases when referring to columns within those tables.
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