xxxx18一60岁hd中国/日韩女同互慰一区二区/西西人体扒开双腿无遮挡/日韩欧美黄色一级片 - 色护士精品影院www

資源簡介

數(shù)據(jù)庫系統(tǒng)概念第六版答案（包括實踐習題，習題）例如3.11答案Exercises ?Write the following queries in SQL, using the university schema. ?Find the names of all students who have taken at least one Comp. Sci. course; make sure there are no duplicate names in the result. ?Find the IDs and names of all students who have not taken any course offering before Spring 2009. 11 ?For each department, find the maximum salary of instructors in that department. You may assume that every department has at least one instructor. ?Find the lowest, across all departments, of the per-department max- imum salary computed by the preceding query. Answer: ?SQL query: select name from student natural join takes natural join course where course.dept = ’Comp. Sci.’ ?SQL query: select id, name from student except select id, name from student natural join takes where year < 2009 Since the except operator eliminates duplicates, there is no need to use a select distinct clause, although doing so would not affect correctness of the query. ?SQL query: select dept, max(salary) from instructor group by dept

資源截圖

代碼片段和文件信息

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2014-10-23?00:02??6E\
?????目錄???????????0??2014-12-07?21:26??6E\數(shù)據(jù)庫習題解答\
?????文件??????502003??2011-12-14?13:00??6E\數(shù)據(jù)庫習題解答\10s.pdf
?????文件??????556075??2011-12-14?13:01??6E\數(shù)據(jù)庫習題解答\11s.pdf
?????文件??????515936??2011-12-14?13:03??6E\數(shù)據(jù)庫習題解答\12s.pdf
?????文件??????540533??2011-12-14?13:04??6E\數(shù)據(jù)庫習題解答\13s.pdf
?????文件??????489725??2011-12-14?13:05??6E\數(shù)據(jù)庫習題解答\14s.pdf
?????文件??????551118??2011-12-14?13:05??6E\數(shù)據(jù)庫習題解答\15s.pdf
?????文件??????517737??2011-12-14?13:06??6E\數(shù)據(jù)庫習題解答\16s.pdf
?????文件??????483196??2011-12-14?13:07??6E\數(shù)據(jù)庫習題解答\17s.pdf
?????文件??????501625??2011-12-14?13:07??6E\數(shù)據(jù)庫習題解答\18s.pdf
?????文件??????528959??2011-12-14?13:08??6E\數(shù)據(jù)庫習題解答\19s.pdf
?????文件??????484282??2011-12-14?11:48??6E\數(shù)據(jù)庫習題解答\1s.pdf
?????文件??????489927??2011-12-14?13:08??6E\數(shù)據(jù)庫習題解答\20s.pdf
?????文件??????492122??2011-12-14?13:09??6E\數(shù)據(jù)庫習題解答\21s.pdf
?????文件??????502090??2011-12-14?13:10??6E\數(shù)據(jù)庫習題解答\22s.pdf
?????文件??????505534??2011-12-14?13:10??6E\數(shù)據(jù)庫習題解答\23s.pdf
?????文件??????493159??2011-12-14?13:11??6E\數(shù)據(jù)庫習題解答\24s.pdf
?????文件??????503873??2011-12-14?13:12??6E\數(shù)據(jù)庫習題解答\25s.pdf
?????文件??????524689??2011-12-14?13:12??6E\數(shù)據(jù)庫習題解答\26s.pdf
?????文件??????499534??2011-12-14?11:49??6E\數(shù)據(jù)庫習題解答\2s.pdf
?????文件??????542699??2011-12-14?11:50??6E\數(shù)據(jù)庫習題解答\3s.pdf
?????文件??????506570??2011-12-14?11:51??6E\數(shù)據(jù)庫習題解答\4s.pdf
?????文件??????501369??2011-12-14?11:52??6E\數(shù)據(jù)庫習題解答\5s.pdf
?????文件??????522964??2011-12-14?11:52??6E\數(shù)據(jù)庫習題解答\6s.pdf
?????文件??????516439??2011-12-14?11:53??6E\數(shù)據(jù)庫習題解答\7s.pdf
?????文件??????538584??2011-12-14?11:54??6E\數(shù)據(jù)庫習題解答\8s.pdf
?????文件??????502641??2011-12-14?11:54??6E\數(shù)據(jù)庫習題解答\9s.pdf
?????目錄???????????0??2014-12-07?21:26??6E\數(shù)據(jù)庫答案\
?????文件??????514299??2012-08-16?09:49??6E\數(shù)據(jù)庫答案\數(shù)據(jù)庫CH??（10）.pdf
?????文件??????510478??2012-08-16?09:49??6E\數(shù)據(jù)庫答案\數(shù)據(jù)庫CH??（11）.pdf
............此處省略24個文件信息

評論

共有 條評論

相關(guān)資源