The correlation name ‘%.*ls’ is specified multiple times in a FROM clause.

Error Message:
Msg 1011, Level 16, State 1, Line 1
The correlation name ‘%.*ls’ is specified multiple times in a FROM clause.

Severity level:
16.

Description:
This error message appears when you try to use the same name for more than one derived table withing the same scope in a query.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Error of the Severity Level 16 are generated by the user and can be fixed by the SQL Server user. The statement cannot be executed this way. Each derived table in the same scope must have a unique name.

Versions:
All versions of SQL Server.

Example(s):
USE Northwind;
GO
SELECT *
  FROM
   (SELECT CustomerID, COUNT(*)
      FROM dbo.Orders
     GROUP BY CustomerID) AS Orders(CustomerID, nbr)
  JOIN
   (SELECT CustomerID, COUNT(*)
      FROM dbo.Orders
     GROUP BY CustomerID) AS Orders(CustomerID, nbr)
   ON Orders.CustomerID = Orders.CustomerID

Remarks:
In the above example we try to use the name Order for more than one derived table in the same scope. This raises the error.




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