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types, including integer, real, character, logical, date, etc. In any current relational database management system (DBMS), it is impossible for a fool to make a database that does not conform to the first paradigm, because the DBMS does not allow you to divide one column of a database table into two or more columns. Therefore, it is impossible for you to design a database that does not conform to the first paradigm in the existing DBMS. First of all, let's make sure that the content to be des

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,

Python upgrade prompts that the Tkinter module cannot find the solution, pythontkinter 1. Install tkinterIn Linux, python does not install the Tkinter module by default,Copy codeThe Code is as follows:[Root @ li250-193 ~] # PythonPython 2.6.6 (r266: 84292, Feb 22 2013, 00:00:18)[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> Import TkinterTraceback (most recent call last ):File

HDU1202 The calculation of GPA 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 a

1023 GPA and GPA1023 GPA Calculation Time Limit: 1 s space limit: 128000 KB title level: Bronze Question View running resultsDescription Description James finally entered the University Hall. With excitement and enthusiasm, he attended the freshman Conference of the Information Science and Technology College. At the meeting, Professor Mei, President, introduced the calculation method of score in the University: It should be explained that Komatsu's PK University adopts the credit system learnin

: $ PATH" '>> ~ /. Bash_profile (3) add pyenv init to the environment variable. $ Echo 'eval "$ (pyenv init-)" '>> ~ /. Bash_profile (4) repeat your shell $ Exec $ SHELL$ Source ~ /. Bash_profile 3. use pyenv and install python List all available versions Pyenv install-l Install the specified version $ Pyenv install 3.5.2Downloading Python-3.5.2.tar.xz...-> Https://www.python.org/ftp/python/3.5.2/Python-3.5.2.tar.xz Switch to the local python version $ Pyenv local 2.7.12 Switch the global python

The calculation of GPATime limit:2000/1000 MS (java/others) Memory limit:65536/32768 K (java/others)Total submission (s): 21897 Accepted Submission (s): 5028Problem 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

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First paradigm: each field is the smallest and cannot be divided. Second paradigm: In the database field, there is no partial dependency of a non-Keyword segment on the keyword segment. Eg: The following table lists the relationships between the selected courses: SelectCourse (student ID, name, course number, score, age, gender, and credits) We can see, (student ID, course number)-> (name, age, score, gender) That is, some dependencies exist, so this

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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 formal te

Please calculate the calculation of GPA Time Limit: 2000/1000 MS (Java/others) memory limit: 65536/32768 K (Java/Others)Total submission (s): 19932 accepted submission (s): 4576Problem 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

One, install Tkinter in Linux, Python does not install the Tkinter module by default, and the Copy code code is as follows: [[emailprotected] ~]# python python 2.6.6 (r266:84292, Feb, 00:00:18) [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2 Type ' help ', ' copyright ' , "credits" or "license" for more information. >>> Import Tkinter Traceback (most recent call last): File Importerror:no module named Tkinter >>> We install Tkinter modul

When we design a database table, we often say that a certain table should follow the third paradigm. The following examples are introduced first, second, third paradigm First Paradigm The first normal form is that the columns of the datasheet cannot be divided. Look at the table below, for the selection of the class column is obviously can be divided, so it is against the first paradigm. School Number name Course Selection 10001 Tom Maths, Chinese, Englis

I. Installation of Tkinterin Linux, Python defaults to not installing the Tkinter module, Copy Code code as follows: [root@li250-193 ~]# python Python 2.6.6 (r266:84292, Feb 22 2013, 00:00:18) [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2 Type ' help ', ' copyright ', ' credits ' or ' license ' for the more information. >>> Import Tkinter Traceback (most recent call last): File "Importerror:no module named Tkinter >>>