comparison query_tabular.xml @ 14:3003fe70f297 draft

Uploaded

13:49ca06d66762

    1    Steven              Jones      1974-04-04  Allie     cat       4  2  3
    0    Jane                Doe        1978-05-24                      5  3  4
    1    James               Smith      1980-10-20  Spot                6  4  5


   Table name: pets

   Table columns: Pets,FirstName,LastName,Birthdate,PetNames,PetType,line_num,entry_num,row_num

   Query: SELECT * FROM pets 

   Result:

     =====  =========  ========  ==========  ========  =======  ========  =========  ======= 
     #Pets  FirstName  LastName  Brithdate   PetNames  PetType  line_num  entry_num  row_num
     =====  =========  ========  ==========  ========  =======  ========  =========  ======= 
     2      Paula      Brown     1978-05-24  Rex       dog      3         1          1
     2      Paula      Brown     1978-05-24  Fluff     cat      3         1          2
     1      Steven     Jones     1974-04-04  Allie     cat      4         2          3
     0      Jane       Doe       1978-05-24                     5         3          4
     1      James      Smith     1980-10-20  Spot               6         4          5          
     =====  =========  ========  ==========  ========  =======  ========  =========  ======= 


.. _Regular_expression: https://docs.python.org/release/2.7/library/re.html
.. _SQLite: http://www.sqlite.org/index.html

    ]]></help>

14:3003fe70f297

    1    Steven              Jones      1974-04-04  Allie     cat       4  2  3
    0    Jane                Doe        1978-05-24                      5  3  4
    1    James               Smith      1980-10-20  Spot                6  4  5


  Table name: pets

  Table columns: Pets,FirstName,LastName,Birthdate,PetNames,PetType,line_num,entry_num,row_num

  Query: SELECT * FROM pets 

  Result:

     ======  ==========  ========  ==========  =========  ========  =========  ==========  ========
     #Pets   FirstName   LastName  BirthDate   PetNames   PetType   line_num   entry_num    row_num
     ======  ==========  ========  ==========  =========  ========  =========  ==========  ========
     2       Paula       Brown     1978-05-24  Rex        dog              3           1         1
     2       Paula       Brown     1978-05-24  Fluff      cat              3           1         2
     1       Steven      Jones     1974-04-04  Allie      cat              4           2         3
     0       Jane        Doe       1978-05-24                              5           3         4
     1       James       Smith     1980-10-20  Spot                        6           4         5          
     ======  ==========  ========  ==========  =========  ========  =========  ==========  ======== 


**Normalizing by Line Filtering into 2 Tables** 

    *People Table*

      ::
  
        Filter 1 - by regex expression matching [include]: '^\d+' (include lines that start with a number) 
        Filter 2 - append a line number column:
        Filter 3 - regex replace value in column[4]: '(\d+)/(\d+)/(\d+)' '19\3-\2-\1' (convert dates to sqlite format) 

      Table: People
      Columns: Pets,FirstName,LastName,DOB,,,id

      ====  =========  ========   ==========  ==
      Pets  FirstName  LastName   DOB         id
      ====  =========  ========   ==========  ==
      2     Paula      Brown      1978-05-24  1
      1     Steven     Jones      1974-04-04  2
      0     Jane       Doe        1978-05-24  3
      1     James      Smith      1980-10-20  4
      ====  =========  ========   ==========  ==


    *Pet Table*

      :: 

        Filter 1 - by regex expression matching [include]: '^\d+' (include lines that start with a number) 
        Filter 2 - append a line number column:
        Filter 3 - by regex expression matching [exclude]: '^0\t' (exclude lines with no pets)
        Filter 4 - normalize list columns[5,6]:

      Table: Pet
      Columns: ,,,,PetName,PetType,id

      ========  ========  ==
      PetName   PetType   id
      ========  ========  ==
      Rex       dog       1
      Fluff     cat       1
      Allie     cat       2
      Spot                4
      ========  ========  ==


    Query: SELECT FirstName,LastName,PetName FROM People join Pet on People.id = Pet.id WHERE PetType = 'cat';     

    Result:

     =========  ========  ========
     FirstName  LastName  PetName 
     =========  ========  ========
     Paula      Brown     Fluff   
     Steven     Jones     Allie   
     =========  ========  ========

.. _Regular_expression: https://docs.python.org/release/2.7/library/re.html
.. _SQLite: http://www.sqlite.org/index.html

    ]]></help>