The "Invalid column name" error means SQL Server doesn’t recognize a column you're referencing in your SQL query. It may be caused by a typo, a column that doesn’t exist in the current table, or by referencing an alias too early in a query (like in a WHERE or GROUP BY clause).
SQL Server parses and validates column names before running the query. This means even if a column alias will be created later in a SELECT clause, it can’t be used in earlier clauses like WHERE, JOIN ON, or GROUP BY.
Sometimes the column does exist, but you're querying the wrong table, a different schema, or referencing a temp table that was modified or dropped. Intellisense in SQL Server Management Studio (SSMS) may also be out of sync—refreshing it helps in some cases.
WHERE or JOIN clauseQ: Why do I get this error when the column exists?
A: You might be referencing the wrong table, a different schema, or a column alias too early in the query. Always double-check the table structure and query order of operations.
Q: Can I use aliases in WHERE or JOIN clauses?
A: No—SQL Server evaluates WHERE, GROUP BY, and JOIN clauses before SELECT, so aliases aren’t available yet. Use the full expression instead.
Q: Does this mean the column was deleted?
A: Not necessarily. It might just be a typo or a mismatch between the query and the actual table structure. Also, if the table was recently changed, refresh metadata or reconnect to your database.
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