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Operator = > < >= <= != !< !> AND OR NOT IN LIKE Meaning equal to greater than less than greater than or equal to less than or equal to not equal to not less than not greater than True if both boolean comparisons are true True if either boolean expression are true Reverses the truth value of another boolean operator True if the operand is one of the listed values, or one of the values returned by a subquery True if the operand matches a pattern % matches anything _ (underscore) matches any one character Other characters match themselves True if the operand is within the range specified True if a subquery returns any rows True if all of a set of comparisons are true True if any one of a set of comparisons is true True if some of a set of comparisons is ture
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This will report the CS majors in alphabetical order by name. To sort in reverse alphabetical order, add the word DESC (descending) at the end of the query. What would this query report SELECT Major FROM Student; It would return one line for each student, and each line would contain a major field of study. If 300 students major in computer science, there will be 300 lines containing the words Computer Science . Such a report is probably not what one had in mind. Probably one is interested in a list of the different major fields of study of the students. One can get such a report by adding the word DISTINCT to the SELECT query: SELECT DISTINCT Major FROM Student; What if the information in which one is interested is spread among several tables Such a query requires a JOIN of the tables. There is more than one way to specify a JOIN, and there are different types of JOINs for different situations. Suppose one is interested in a list of student names and the names of the Resident Advisors in their dormitories. Here is one way to JOIN the Student and Dorm tables to combine the information: SELECT Sname, RA FROM Student, Dorm WHERE Student.Dorm = Dorm.Dorm; Conceptually, a JOIN works by concatenating the rows in the two relations where the specified test is true. In this case, each row in the Student table is concatenated with the row in the Dorm table where the value of the Dorm column in the Dorm table is the same as the value of the Dorm column in the Student table (Student.Dorm is how the Dorm column in the Student table is specified. Likewise Dorm.Dorm specifies the Dorm column in the Dorm table.). Then the selection of columns Sname and RA occurs from the concatenated row.
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Another way to write the same JOIN query would be to use this syntax: SELECT Sname, RA FROM Student JOIN Dorm ON Student.Dorm = Dorm.Dorm; Either syntax is acceptable. In both cases, the column named Dorm, which exists in both tables, must be disambiguated by qualifying each use of Dorm with the name of the table to which it applies. One might add two more tables to the University database to track clubs and student participation in them. Many students can join any club, and each student can belong to many clubs, so the relationship will be M:N. One must create a table to track the clubs, and an intersection table to track club membership: CREATE TABLE Club ( Cname VarChar(20) Not Null, Dues Integer, Building VarChar(20), Room Integer CONSTRAINT ClubPK PRIMARY KEY (Cname) ); CREATE TABLE ClubMembership ( Cname VarChar(20) Not Null, MemberName VarChar(20) Not Null CONSTRAINT ClubMembershipPK PRIMARY KEY (Cname, MemberName), CONSTRAINT ClubMembership_Club_FK FOREIGN KEY (Cname) REFERENCES Club( Cname ); CONSTRAINT Member_FK FOREIGN KEY (MemberName) REFERENCES Student( Sname ); ); To retrieve a list of students, their majors, and the clubs to which they belong, one could use this query that joins the Student and ClubMembership tables: SELECT Sname, Major, Cname FROM Student JOIN ClubMembership ON Student.Sname = ClubMembership.MemberName; The dot notation in the last line says that we are interested in joining rows where the Sname column in the Student table matches the MemberName column in the ClubMembership table. The results of this query will include a row for each student who participates in a club, and if a student participates in more than one club, there will be multiple rows for that student. What if one also wanted to know which students did not participate in any clubs A solution would be to use an outer join. A standard, or inner, join assembles information from a pair of tables by making a new row combining the attributes of both tables whenever there is a match between tables on the join condition. In the previous example, whenever there is a match between Sname in the Student table and MemberName in the ClubMembership table, the join creates a new row that includes all the attributes of both tables. The SELECT then reports the values of Sname, Major, and Cname from the combined row. An outer join includes each row in one or both tables, regardless of whether the row matches on the join condition. For instance, to show all students, regardless of club membership, the query above can be modified with the word LEFT:
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