How to fix Error 4170 on Windows Server 2025 / Windows 11

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Why This Error Happens

Error 4170 occurs when a Transact-SQL query attempts to use the ANY, SOME, or ALL keyword against an expression that is not a valid subquery result set (a “multiset”). This typically happens when a developer uses ANY/SOME with a scalar subquery, a comma-separated list, or a malformed subquery that SQL Server 2025’s parser cannot resolve into a row-set. It is a query construction issue rather than a server configuration or permissions problem, meaning the fix lies entirely within the T-SQL code itself.

Step-by-Step Resolution Guide

Step 1: Identify the Offending Query

  • Open SQL Server Management Studio (SSMS) or Azure Data Studio and locate the exact query referenced in the error log (check Event Viewer > Applications and Services Logs > MSSQLSERVER).
  • Look specifically for WHERE column = ANY (...) or = SOME (...) clauses.
  • Confirm whether the parenthetical expression following ANY/SOME is a full SELECT statement or just a static value/list.

Step 2: Correct the Subquery Syntax

  • Rewrite the clause so the ANY/SOME keyword is followed by a complete, valid subquery rather than a static list.
  • Incorrect: WHERE SalaryID = ANY (100, 200, 300)
  • Correct (Subquery): WHERE SalaryID = ANY (SELECT SalaryID FROM dbo.Salaries WHERE Region = 'West')
  • If you are simply trying to match a list of static values, replace ANY (...) with the IN (...) operator instead, as IN supports static lists natively: WHERE SalaryID IN (100, 200, 300).

Step 3: Validate Data Types and Multiset Compatibility

  • Ensure the column on the left side of the comparison operator matches the data type of the column being returned inside the subquery’s SELECT list.
  • Check that the subquery does not return multiple columns (it should return a single column representing a set of rows).
  • Save the script and re-run it in a new query window to parse for syntax errors (Ctrl + F5 in SSMS to parse without execution).

Step 4: Check ORM or Application-Generated Queries

  • If the query was not written manually but generated by an Object-Relational Mapper (ORM) like Entity Framework or Hibernate, update the ORM to the latest patch compatible with SQL Server 2025.
  • Clear the ORM’s query cache to ensure it regenerates the SQL using correct ANSI standard syntax.

Alternative or Verification Steps

  • Verification: Execute the corrected query in a test environment using SET SHOWPLAN_TEXT ON to ensure the execution plan compiles without throwing Error 4170.
  • Alternative: If refactoring the ANY clause is complex, replace the entire logic with an EXISTS clause (e.g., WHERE EXISTS (SELECT 1 FROM Table WHERE Condition)), which often provides better performance and avoids multiset ambiguity entirely.