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About dynamic query in chapter 7 of JPA Pro 2nd edition

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Hi, the book shows a query:

The book says the query created will have a single quote prefix of empName like this:
SELECT e.salary  FROM Employee e WHERE e.department.name = 'NS65' AND e.name = ''Roberts' ;

Roberts becomes 'Roberts. And it won't find Robert's record.
However, after I tried a few times with this created query, it can find the Robert's record.

no wonder he is so sad, he hasn't seen this tiny ad:
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