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As the title indicates:
Is there a way to turn off implicit type conversion in SQL Server?
I want the following simple SQL to generate an error
SELECT 'a' WHERE 1='1'
There is no way to disable it.
It has been requested though: see the proposed
SET OPTION STRICT ONMS Connect request which comes from Erland SommarskogHowever, it is utterly predictable according to datatype precedence rules
Your example of a foreign key is interesting because an actual FOREIGN KEY constraint requires the same datatype, length and collation.