Implicit conversion from data type %ls to %ls is not allowed. Use the CONVERT function to run this query.

Error Message:
Msg 257, Level 16, State 3, Line 2
Implicit conversion from data type %ls to %ls is not allowed. Use the CONVERT function to run this query.

Severity level:
16.

Description:
This error message appears when you try to run a query with a implicit conversion from one data type to another, but this conversion is only allowed when done explicit.

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. You cannot run the statement this way. You need to use the CAST() or CONVERT() function to explicitly perform the conversion.

Versions:
All versions of SQL Server.

Example(s):
DECLARE @f float;
SET @f = GETDATE();

Remarks:
In the above example we try to implicitly convert the variable @f from type float to typ datetime. This raises the error.




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