How to fix Error 473 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 473 – Incorrect Value Supplied in PIVOT Operator

Why This Error Happens

This error occurs when the value list specified in the PIVOT operator’s IN clause does not match the actual data values present in the column being pivoted, often due to case sensitivity, data type mismatches, or trailing whitespace. It can also happen when a value in the pivot column contains characters that cannot be implicitly converted to a valid column identifier. Additionally, corrupted or inconsistent collation settings between the source table and the query session can trigger this mismatch on SQL Server 2025 instances running on Windows Server 2025 or Windows 11.

Step-by-Step Resolution Guide

Step 1: Validate the Distinct Values in the Pivot Column

  • Run a SELECT DISTINCT query on the column you intend to pivot to confirm exact spelling, casing, and spacing.
  • Example: SELECT DISTINCT [ColumnName] FROM [YourTable];
  • Compare this output character-by-character against the values listed in your PIVOT ... IN (...) clause.

Step 2: Check Collation and Data Type Compatibility

  • Verify the collation of the pivoted column using: SELECT DATABASEPROPERTYEX('YourDB', 'Collation');
  • Ensure the values in the IN clause match the column’s collation (case-sensitive vs. case-insensitive).
  • If using NVARCHAR columns, ensure your literal values in the IN clause are prefixed with N (e.g., N'ValueName').

Step 3: Rebuild the Query Using Dynamic SQL

  • If the pivot values are dynamic or user-generated, hardcoding them in the IN clause is risky.
  • Use dynamic SQL to generate the pivot list programmatically:
  DECLARE @cols NVARCHAR(MAX);
  SELECT @cols = STRING_AGG(QUOTENAME([ColumnName]), ',') FROM (SELECT DISTINCT [ColumnName] FROM [YourTable]) AS T;
  • This avoids manual typos and ensures the IN clause always reflects current data.

Step 4: Clear Cached Execution Plans

  • On Windows Server 2025, open SQL Server Management Studio (SSMS) and connect to the instance.
  • Run DBCC FREEPROCCACHE; to eliminate any stale execution plans that may be referencing outdated pivot values.
  • Re-execute the corrected query to confirm the plan is rebuilt correctly.

Alternative or Verification Steps

  • Verify the fix by re-running the original query with the corrected IN clause and confirming no Error 473 is thrown, then check the result set row/column counts match expectations.
  • If the error persists, temporarily replace the PIVOT operator with a CASE WHEN aggregation query to confirm the underlying data is clean before reintroducing the PIVOT syntax.