UPDATE BOOK SET BOOK.SENDCLASS=(select 1 FROM SERIALBOOKRELATED WHERE SERIALBOOKRELATED.SID='1111' AND BOOK.ID=SERIALBOOKRELATED.BID)
where exists(select 1 FROM SERIALBOOKRELATED WHERE SERIALBOOKRELATED.SID='1111' AND BOOK.ID=SERIALBOOKRELATED.BID);
where exists(select 1 FROM SERIALBOOKRELATED WHERE SERIALBOOKRELATED.SID='1111' AND BOOK.ID=SERIALBOOKRELATED.BID);
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