Find the index of a missing row
Hello,
I would like some help in designing this query. For example i have a table with these record.
ID_BOOK | Name | Surname
1 Name1 SurName1
2 Name2 Surname2
3 Name3 Surname3
4
Name4 Surname4
6 Name6 Surname6
where ID_BOOk is a primary key
For example the missing row of 5 was previously deleted and i have no information about it. I need to write a query for the value of the primary key that was deleted by the previous query or if none of the rows werent deleted i want the last row or
at least turn 0. I also need to implement this in LINQ in C# but at least need the logic in SQL. Thank you very much.
Hello,
This should work for you: Self JOIN on the table over ID_BOOK whereby you add 1 on the right side, then check if rows don't return a right record =>
SELECT SRC.ID_BOOK + 1 AS MissingID
FROM yourTable AS SRC
LEFT JOIN
yourTable AS DST
ON SRC.ID_BOOK = (DST.ID_BOOK + 1)
WHERE DST.ID_BOOK IS NULL
Olaf Helper
[ Blog] [ Xing] [ MVP]
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El 04/05/2009, a las 11:54, alice_data <[email protected]> escribió:
>
Hi,
>
I have a burning question here, and I wonder if anyone has tried to
do this.
I have an XML file that is read into the xml collection, and for
each of the names that appear in the file (pre-declared somewhere
else) , I tried to remove the element.
>
However, it either gives me -1, if I do
trace(slc.getItemIndex(xml.@name).toString()); when they exist, or
tell me #3594 as shown in the error below:
>
Here is the code:
>
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xlc = new XMLListCollection(searchResult..book);
len = searchResult..publisher.length();
for (idx=0;idx<len; idx++) {
if (checkBox[idx].selected == false) {
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>
>
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Message was edited by:
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