my sound does not work unless you use headphones
No sound
Hello
· Did you do changes on the computer before the show?
· You get the error message?
Follow the steps in the article.
Tips for solving common audio problems
For reference:
Sound cards: frequently asked questions
Tags: Windows
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UPDATE CLASS
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Clearly, you can't student who is 3 as to Member of class 1. Please help me. Thank you.
Published by: 991096 on March 1st, 2013 02:36
Published by: 991096 on March 1st, 2013 03:03
Published by: 991096 on March 1st, 2013 03:11Hello
991096 wrote:
1. the purpose of this trigger is to check when to choose a student going to match, this student has in his class where it belongs to. Then, when I try to choose 3 student-member of correspondence of class 1, should give me "PLEASE RE-ENTER ID AND STUDENT ID AS CLASS or STUDENT not IS NOT VALID."Then do something like this:
CREATE OR REPLACE TRIGGER CHECK_SCHOSEN BEFORE INSERT OR UPDATE OF SCHOSEN ON CLASS FOR EACH ROW WHEN (NEW.SCHOSEN IS NOT NULL) DECLARE sid_found stu.sid%TYPE; BEGIN dbms_output.put_line (:NEW.schosen || ' = schosen entering check_schosen'); SELECT sid INTO sid_found FROM stu WHERE sid = :NEW.schosen AND cid = :NEW.cid AND ROWNUM = 1 -- to avoid TOO_MANY_ROWS ; EXCEPTION WHEN NO_DATA_FOUND THEN RAISE_APPLICATION_ERROR ( -20000 , 'Please re-enter class id and student id as class (' || :NEW.cid || ') or student (' || :NEW.schosen || ') is not valid.' ); end; /
DBMS_OUTPUT creates only a message. The message may not be displayed, and if this is the case, then the user cannot see it. The DML will still take place.
I used instead, RAISE_APPLICATION_ERROR to keep the DML does not happen. It displays a message likeORA-20000: Please re-enter class id and student id as class (1) or student (3) is not valid.
' 2 ' game ' means ' an official competition in which two several people or teams competing.
What individuals or teams are competing in this case?
In any case, the question wasn't 'that 'game' means', butFrank Kulash wrote:
What do you mean when you say "going to match?I think that now you're saying that the new values of (class.cid, class.schosen) must be equal to (or "fit") some existing (stu.cid, stu.sid).
3. thanks for your tip, I learned how to use '{code} '.
4. it's really goes with the exception of MUTATING_TABLE. So, how do to fix the trigger to show me INVALID_STU EXCEPTION when I try to choose a student does not belong
a class?Don't refer to the table of class in the trigger, and the error table mutation occur. All the information you need are in the stu table, so there is no need to query the table of class, anyway.
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