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SELECT FacFirstName, FacLastName, FacHireDate FROM Faculty WHERE FacHireDate BETWEEN #1/1/1999# AND #12/31/2000#
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FacFirstName CRISTOPHER JULIA FacLastName COLAN MILLS FacHireDate 01-Mar-1994 15-Mar-2000
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E X A M P L E 45 (Oracle)
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Conditions on Date Columns In Oracle SQL, the standard format for dates is DD-Mon-YYYY where DD is the day number, Mon is the month abbreviation, and YYYY is the four-digit year
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SELECT FacFirstName, FacLastName, FacHireDate FROM Faculty WHERE FacHireDate BETWEEN '1-Jan-1999' AND '31-Dec-2000'
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Query Formulation with SQL 89
B e s i d e s testing columns for specified values, y o u sometimes need to test for the lack o f a value Null values are used when there is n o normal value for a column A null can mean that the value is unknown or the value is not applicable to the row For the Offering table, a null value for FacSSN means that the instructor is not yet assigned Testing for null values is done with the IS N U L L comparison operator as shown in Example 46 You can also test for a normal value using IS N O T N U L L
E X A M P L E 46
Testing f o r Nulls List the offering number and course number of summer 2 0 0 6 offerings without an assigned instructor SELECT OfferNo, CourseNo FROM Offering WHERE FacSSN IS NULLAND OffTerm = 'SUMMER' AND OffYear = 2006 OfferNo 1111 CourseNo IS320
mixing AND and OR always use parentheses to make the grouping of conditions explicit
Example 47 depicts a complex logical expression involving both logical operators A N D and OR W h e n mixing A N D and OR in a logical expression, it is a g o o d idea to use paren theses Otherwise, the reader o f the SELECT statement may not understand h o w the A N D and O R conditions are grouped Without parentheses, y o u must depend o n the default w a y that A N D and O R conditions are grouped
E X A M P L E 47
Complex Logical Expression List the offer number, course number, and faculty Social Security number for course offerings scheduled in fall 2 0 0 5 or winter 2 0 0 6 SELECT OfferNo, CourseNo, FacSSN FROM Offering WHERE (OffTerm = 'FALL' AND OffYear = 2005) OR (OffTerm = 'WINTER' AND OffYear = 2006) OfferNo 1234 4321 4444 5555 5678 6666 CourseNo IS320 IS320 IS320 FIN300 IS480 FIN450 FacSSN 098-76-5432 098-76-5432 543-21-0987 765-43-2109 987-65-4321 987-65-4321
Joining Tables
= OfferingCourseNo is specified in the W H E R E clause
Example 48 demonstrates a j o i n o f the Course and Offering tables The j o i n condition CourseCourseNo
Part Two
Understanding Relational Databases
E X A M P L E 48 (Access)
Join Tables b u t S h o w Columns f r o m O n e Table Only |_j
s tt n e 0
f f i g number, course number, days, and time of offerings containing the words
e r n
database or programming in the course description and taught in spring 2 0 0 6 The Oracle version of this example uses the % instead of the * as the wildcard character
SELECT OfferNo, OfferingCourseNo, OffDays, OffTime FROM Offering, Course WHERE OffTerm = 'SPRING' AND OffYear = 2006 AND (CrsDesc LIKE "DATABASE*' OR CrsDesc LIKE "PROGRAMMING*') AND CourseCourseNo = OfferingCourseNo
OfferNo 3333 5679
CourseNo IS320 IS480
OffDays MW TTH
OffTime 8:30 AM 3:30 PM
There are two additional points o f interest about Example 48 First, the CourseNo column names must be qualified (prefixed) with a table name (Course or Offering) Other w i s e , the S E L E C T statement is ambiguous because CourseNo can refer to a column in either the Course or Offering tables Second, both tables must be listed in the F R O M clause ~ even though the result columns c o m e from only the Offering table The Course table is needed in the F R O M clause because conditions in the W H E R E clause reference CrsDesc, a column o f the Course table Example 49 demonstrates another join, but this time the result columns c o m e from both tables There are conditions o n each table in addition to the j o i n conditions The Oracle formulation uses the % instead o f the * as the wildcard character
E X A M P L E 49 (Access)
Join Tables a n d S h o w Columns f r o m B o t h Tables List t h e offer number, course number, and n a m e of the instructor of IS course offerings scheduled in fall 2 0 0 5 taught by assistant professors
SELECT OfferNo, CourseNo, FacFirstName, FacLastName FROM Offering, Faculty WHERE OffTerm = 'FALL' AND OffYear = 2005 AND FacRank = A S S T ' AND CourseNo LIKE 'IS*' AND FacultyFacSSN = OfferingFacSSN
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