SELECT 1 FROM

SELECT 1 FROM HOSTACCMAST HTAM WHERE VC.VOUCHERTYPENO='A01'
  AND VC.VOUCHERNO=HTAM.ACCOUNTNO

 

SELECT * from score;

select 1 from SCORE t where t.stuid ='B010';

-

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delete from score s where s.courseid = '化学';
delete from score s where s.courseid = '科学';

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SELECT * from score;

select 1 from SCORE t where t.stuid ='B010';

select 1 from SCORE t where t.stuid ='xxx';