The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".
The following errata were submitted by our customers and approved as valid errors by the author or editor.
Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update
| Version |
Location |
Description |
Submitted By |
Date submitted |
Date corrected |
| Printed |
Page 12
The Students Example |
The last paragraph on the page refers to a file named
ch01.ImplementingSetDifference.objects.sql.
Replace ch01
with ch02.
The correct filename is:
ch02.ImplementingSetDifference.objects.sql.
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Anonymous |
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| Printed |
Page 16-18
The solution query Recipe 2.4 |
I neglected to include the term paper score in the HAVING clauses of my
solution query shown on page 16. Following is the first half of that UNION query as it really should be.
Note the addition of sn.Score=so.Score to the HAVING clause of the subquery.
SELECT so.*, COUNT(*) DupeCount, 'StudentsOct' TableName
FROM StudentsOct so
GROUP BY so.CourseId, so.StudentName, so.Score, so.TermPaper
HAVING NOT EXISTS (
SELECT sn.*, COUNT(*)
FROM StudentsNov sn
GROUP BY sn.CourseId, sn.StudentName, sn.Score, sn.TermPaper
HAVING sn.CourseId=so.CourseId AND
sn.TermPaper=so.TermPaper AND
sn.StudentName=so.StudentName AND
sn.Score=so.Score AND
COUNT(*) = COUNT(ALL so.CourseId))
Likewise, the second query in the UNION should use so.Score=sn.Score in
the HAVING clause.
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Anonymous |
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| Printed |
Page 52
SELECT FROM Matrices |
On page 52 we show the output of a SELECT against the Matrices table. The first column of the output is entitled
Name. That's incorrect. The correct column name is Matrix.
Refer back to the CREATE TABLE statement at the top of the
page, and also refer forward to the matrix examples later in
the chapter. In all those cases, the name of the column containing the matrix name is Matrix.
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Anonymous |
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| Printed |
Page 162
last line |
The text contains the word "vales". That word should be "values".
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Anonymous |
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| Printed |
Page 233
Deleting duplicate rows |
The following text and example is incorrect:
The statement in the following example deletes duplicate rows, arbitrarily retaining one record for each fruit and color combination:
DELETE
FROM Warehouse
WHERE BookId NOT IN (
SELECT MAX(BookId)
FROM Bookstore
GROUP BY Name, Type
HAVING COUNT(*) > 1)
The subquery in this example identifies the highest id number value for each name and color combination. This identifies the row that we are arbitrarily going to keep. All other rows with that name and color combination are deleted. The key here is that id is unique for all rows in a name and type combination.
The following text and example is correct:
The statement in the following example deletes duplicate rows, arbitrarily retaining one record for each name and type combination:
DELETE BookStore
WHERE EXISTS(
SELECT Name
FROM BookStore AS b
WHERE BookStore.Name = b.Name And
BookStore.Type = b.Type
GROUP BY b.Name, b.Type
HAVING COUNT( * ) > 1 And
MAX( B.BookId ) > BookStore.BookId )
The subquery in this example identifies the highest id number value for each name and type combination. This identifies the row that we are arbitrarily going to keep. All other rows with that name and type combination are deleted. The key here is that id must be unique for each row in the group for a name and type combination.
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Anonymous |
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