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docs: handling constraints for databases other than MySQL

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user_guide_src/source/database/query_builder.rst
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@ -937,6 +937,10 @@ constraint by default. Here is an example using an array:
.. literalinclude:: query_builder/112.php
.. note:: For databases other than MySQL, if a table has multiple keys (primary or unique),
the primary key will be prioritized by default when handling constraints. If you prefer
to use a different unique key instead of the primary key, use the ``onConstraint()`` method.
The first parameter is an associative array of values.
Here is an example using an object: