What happens when you compare different data types?

< 1 min read

When you compare different data types, SQL tries to implicitly convert one type to match the other.
If conversion is not possible, it throws an error.
Implicit conversions can also lead to unexpected results or performance issues.
In my project, comparing a string date to a date column required explicit CAST.
Without casting, the query failed or returned no rows.
Data type mismatches can affect joins, filters, and calculations.
Ensuring proper types prevents errors and maintains data accuracy.

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