Remove data from tables

  • Comments posted to this topic are about the item Remove data from tables

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    ;-)β€œEverything has beauty, but not everyone sees it.” ― Confucius

  • I suspect answer D (one of the correct ones) needs to be "DELETE FROM" rather than "DELETE TABLE".


    Cheers,
    - Mark

  • The "delete table BBB;" statement in d) will fail.

  • Got Lucky as I chose (d) where no other possible option is left!! πŸ˜€

    Thanks for the question.. Often I use the similar queries in our pre-production environment to generate new records... πŸ™‚

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  • "Delete table" is not a correct syntax in option d.

    Correct and is option c and f.

    Thanks,

    Divya.

  • I only marked option F). Option D) has a wrong syntax. It should be delete from BBB; delete from AAA;

  • Same as, D would not work so my answer of F is then correct πŸ˜€

  • Jostein Saethern (3/4/2015)


    The "delete table BBB;" statement in d) will fail.

    Its just a typo.

  • divu.17 (3/5/2015)


    "Delete table" is not a correct syntax in option d.

    Correct and is option c and f.

    Thanks,

    Divya.

    C is not correct, cause you can`t delete any rows from table AAA until first you delete all referenced rows in table BBB.

  • Nice question, unfortunately poorly implemented.

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    MCSE Business Intelligence - Microsoft Data Platform MVP

  • Hany Helmy (3/5/2015)


    Jostein Saethern (3/4/2015)


    The "delete table BBB;" statement in d) will fail.

    Its just a typo.

    That's not a typo, that is a mistake.

    DELETE FRAM BBB, that is a typo.

    Need an answer? No, you need a question
    My blog at https://sqlkover.com.
    MCSE Business Intelligence - Microsoft Data Platform MVP

  • Even ignoring the typo/mistake, the explanation is totally wrong. It is nothing to do with whether the statements are logged, and it is common incorrect) myth that TRUNCATE TABLE is not logged. I'm slightly surprised that this misleading assertion slipped through the net.

    The reason that none of the TRUNCATE AAA statements will work is that you cannot truncate a table that is referenced by a foreign key. This is true irrespective of whether there is any data in it - you can verify this by simply creating the tables, not populating them, and trying to TRUNCATE TABLE AAA.

  • Toreador (3/5/2015)


    Even ignoring the typo/mistake, the explanation is totally wrong. It is nothing to do with whether the statements are logged, and it is common incorrect) myth that TRUNCATE TABLE is not logged. I'm slightly surprised that this misleading assertion slipped through the net.

    The reason that none of the TRUNCATE AAA statements will work is that you cannot truncate a table that is referenced by a foreign key. This is true irrespective of whether there is any data in it - you can verify this by simply creating the tables, not populating them, and trying to TRUNCATE TABLE AAA.

    +1

  • No such command as "DELETE TABLE". I thought that was the catch so went for the two truncates (against my better judgement). There was only one correct answer.

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    MCSA SQL Server 2012

  • Why the b) choice ( truncate BBB , delete AAA ) is not correct ?

    It seems for me that as soon as there is no more rows in the BBB table , it is possible to execute a truncate or delete on the table AAA.

    Maybe , I have missed something about the behaviour of truncate/delete in case of foreign key.

    According to me , the b , d , f choices are correct. Always do a delete/drop on the BBB table with the foreign key before do a delete/drop on the AAA table.

    Or , I have misunderstood the meaning of the b choice ( I recognized that my English understanding is far to be good ).

    Have a nice day

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