vsvdhulei commented on issue #5340:
URL: https://github.com/apache/seatunnel/issues/5340#issuecomment-2120325335
mysql，use the function:coalesce(),to resovle this question.
for example:
select pid,coalesce(grade, '') as grade from exam_paper
//if grade is null ,it will return '' ,and then ,there will have no null
value when you search the database.
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