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columns. Therefore, it is impossible for you to design a database that does not conform to the first paradigm in your existing DBMS. The second paradigm (2NF ): A partial function dependency of a non-critical field on any of the candidate key fields is not present in the database table (some of the function dependencies refer to situations where some fields in the composite keyword determine non-critical fields), or all non-critical fields are completely dependent on any set of candidate keywo
does not conform to the first paradigm in your existing DBMS. ? Second Paradigm Second paradigm (2NF): A partial function dependency of a non-critical field on any of the candidate key fields is absent from the database table (some of the function dependencies refer to situations where some fields in the composite keyword determine non-critical fields), or all non-critical fields are completely dependent on any set of candidate keywords. {It can be understood that: in a family, any decision can
differentiated. In short, the second normal form (2NF) is completely dependent on the primary key for the non-master attribute. The so-called full dependency is the inability to have attributes that depend only on the primary key (with function dependencies W→a, if there is XW, x→a established, then called w→a is local dependence, otherwise called w→a is a complete function dependency). If present, then this part of the attribute and primary key should be separated to form a new entity, and th
table is Selectcourse (school number, name, age, course name, score, credits), keyword for the combination of keywords (study number, course name), because of the following decision relationship:(School number, course name) → (name, age, score, credits)This database table does not meet the second normal form because of the following decision relationship:(course name) → (
the selection relationship table is Selectcourse (school number, name, age, course name, score, credits), keyword for the combination of keywords (study number, course name), because of the following decision relationship:(School number, course name) → (name, age, score, credits)This database table does not meet the second normal form because of the following decision relationship:(course name) → (
-critical field on any of the candidate key fields is absent from the database table (some of the function dependencies refer to situations where some fields in the composite keyword determine non-critical fields), or all non-critical fields are completely dependent on any set of candidate keywords.Assume that the selection relationship table is Selectcourse (school number, name, age, course name, score, credits), keyword for the combination of keywor
composite keyword determine a non-critical field), or all non-critical fields are completely dependent on any set of candidate keywords.Assume that the selection relationship table is Selectcourse (school number, name, age, course name, score, credits), keyword for the combination of keywords (study number, course name), because of the following decision relationship:(School number, course name) → (name, age, score,
specified table in the FROM clause. For example, if the "name" field is not added when the CS_XS view is defined, an error occurs during data insertion. Www.2cto.com 8. Modify the data using the UPDATE statement. You can modify the data examples of the basic table through the view: increase the total credits of all students in the CS_XS view by 8. UPDATECS_XS SET total credits = total
I am going to prepare for a review recently. Taking the MSSERVER2005 examination is a summary of the relevant SQL statements. Generally, I have not written any frequently-used SQL statements, which may be used and are not frequently used, however, it is not unnecessary syntax, and we hope to use the SQL statement SELECTDISINCT (student ID) for everyone. The level of CASEWHEN total credits 50THEN pass WHEN total cr
Miyu original, post Please note: Reprinted from __________ White House Question address:Http://acm.hdu.edu.cn/showproblem.php? PID = 1, 1202Description:Problem descriptionAt the end of each semester, everyone is busy calculating their average score. This score is directly related to scholarship evaluation. Both foreign universities calculate GPa (grade point average), also known as GPR (grade point ratio), that is, the weighted average of score points and
The Calculation of GPA Time Limit: 2000/1000 MS (Java/others) memory limit: 65536/32768 K (Java/Others)Total submission (s): 18748 accepted submission (s): 4331Problem description at the end of each semester, everyone is busy calculating their average score. This score is directly related to scholarship evaluation. Both foreign universities calculate GPa (grade point average), also known as GPR (grade point ratio), that is, the weighted average of score points and
The Calculation of GPA Time Limit: 2000/1000 MS (Java/others) memory limit: 65536/32768 K (Java/Others) Total submission (s): 19000 accepted submission (s): 4391 Problem description at the end of each semester, everyone is busy calculating their average score. This score is directly related to scholarship evaluation. Both foreign universities calculate GPa (grade point average), also known as GPR (grade point ratio), that is, the weighted average of score points and
When doing statistics, NULL is not counted within count. Therefore, the value of the field should not be set to null.For example: SELECT COUNT (user_id) as Beyond_num from fs_users_added where creditsI need to make a count of how many users have lower credits than this. Calculate rankings. Results The data statistics are inaccurate due to the null credits value. Obviously 90 users exceeded, the results are
the score, and credit indicates the credit. The preceding condition indicates a combination of keywords (SNO, CNO)There are the following problems when using the above link mode in applications:A. data redundancy. Assume that 40 students take the same course and 40 credits are repeated.B. The update is abnormal. If the credits of a course are adjusted, the corresponding credit values of the corresponding t
MySQL batch Insert application ON DUPLICATE KEY UPDATE It is not clear whether the problem is design or implementation.At last, it was a strange demand for me. Award_credit_room table, which stores user gift historyAward_credit is the point record generated by user gift giving. After the data of award_credit_room is summarized, You need to Insert the data to the award_credit table in batches,If no record exists, Insert the statement. If a record exists, Update the statement. Use MySQL custom var
Time limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others) Total Submission (s): 23453 Accepted Submission (s): 5441Problem description at the end of each semester, everyone will be busy calculating their average results, which is directly related to the evaluation of scholarships. Foreign universities are computing GPA (grade point average), also known as GPR (grade points ratio), which is the weighted average of scores and credits
name. If the student ID, name, and total credits are projected in the student information table, the formula is :? Student ID, name, total credits (student). The calculation result is as follows: student ID, surname, name, total score, 081101 Wang Lin 50, 081102 Cheng Ming 50, 081103 Wang Yan 50, 3. join joins Concatenates rows in two tables according to the given conditions to form a new table, which is r
that time was terrible. I had two credits and was about to carry the second trial reading. According to the policies of the University of Industry and Information Technology, the secondary trial reading should be expelled from school. However, the school has offered a special course during the holidays. The course is not in a unified curriculum arrangement, but can earn valid credits; the lecturers are not
']! = $discuz _uid? 1:0), 0, $post [' Authorid '], $post [' first ']; Modified: discuzcode.func.php Open: include\discuzcode.func.php DZ4.1, find: function Discuzcode ($message, $smileyoff, $bbcodeoff, $htmlon = 0, $allowsmilies = 1, $allowbbcode = 1, $allowimgcode = 1, $allowhtml = 0, $jammer = 0) {Replaced by: function Discuzcode ($message, $smileyoff, $bbcodeoff, $htmlon = 0, $allowsmilies = 1, $allowbbcode = 1, $allowimgcode = 1, $allowhtml = 0, $jammer = 0, $first = ' 0 ') {then the follow
sequence and define a non-out function for filtering>>> def _not_divisible (n):... return lambda x:x% n > 03. Generating a sequence of prime numbers with filter>>> def prims ():... yield 2... it = _odd_iter () # the first odd sequence 3,5,7,9,11,13... while True:... n = next (IT) # first time with 3 for non-removable function filtering... it = filter (_not_divisible (n), it) # a new odd sequence formed:3,5,7,11,13,17, naturally the second time brought into 5 for non-removable filtering. 4. try
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