Mercurial > repos > jjohnson > query_tabular

comparison query_tabular.xml @ 14:3003fe70f297 draft

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author jjohnson
date Fri, 09 Jun 2017 11:24:56 -0400
parents fd16243931d6
children 5b4f6cf857cf
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13:49ca06d66762 14:3003fe70f297
511 1 Steven Jones 1974-04-04 Allie cat 4 2 3 511 1 Steven Jones 1974-04-04 Allie cat 4 2 3
512 0 Jane Doe 1978-05-24 5 3 4 512 0 Jane Doe 1978-05-24 5 3 4
513 1 James Smith 1980-10-20 Spot 6 4 5 513 1 James Smith 1980-10-20 Spot 6 4 5
514 514
515 515
516 Table name: pets 516 Table name: pets
517 517
518 Table columns: Pets,FirstName,LastName,Birthdate,PetNames,PetType,line_num,entry_num,row_num 518 Table columns: Pets,FirstName,LastName,Birthdate,PetNames,PetType,line_num,entry_num,row_num
519 519
520 Query: SELECT * FROM pets 520 Query: SELECT * FROM pets
521 521
522 Result: 522 Result:
523 523
524 ===== ========= ======== ========== ======== ======= ======== ========= ======= 524 ====== ========== ======== ========== ========= ======== ========= ========== ========
525 #Pets FirstName LastName Brithdate PetNames PetType line_num entry_num row_num 525 #Pets FirstName LastName BirthDate PetNames PetType line_num entry_num row_num
526 ===== ========= ======== ========== ======== ======= ======== ========= ======= 526 ====== ========== ======== ========== ========= ======== ========= ========== ========
527 2 Paula Brown 1978-05-24 Rex dog 3 1 1 527 2 Paula Brown 1978-05-24 Rex dog 3 1 1
528 2 Paula Brown 1978-05-24 Fluff cat 3 1 2 528 2 Paula Brown 1978-05-24 Fluff cat 3 1 2
529 1 Steven Jones 1974-04-04 Allie cat 4 2 3 529 1 Steven Jones 1974-04-04 Allie cat 4 2 3
530 0 Jane Doe 1978-05-24 5 3 4 530 0 Jane Doe 1978-05-24 5 3 4
531 1 James Smith 1980-10-20 Spot 6 4 5 531 1 James Smith 1980-10-20 Spot 6 4 5
532 ===== ========= ======== ========== ======== ======= ======== ========= ======= 532 ====== ========== ======== ========== ========= ======== ========= ========== ========
533 533
534
535 **Normalizing by Line Filtering into 2 Tables**
536
537 *People Table*
538
539 ::
540
541 Filter 1 - by regex expression matching [include]: '^\d+' (include lines that start with a number)
542 Filter 2 - append a line number column:
543 Filter 3 - regex replace value in column[4]: '(\d+)/(\d+)/(\d+)' '19\3-\2-\1' (convert dates to sqlite format)
544
545 Table: People
546 Columns: Pets,FirstName,LastName,DOB,,,id
547
548 ==== ========= ======== ========== ==
549 Pets FirstName LastName DOB id
550 ==== ========= ======== ========== ==
551 2 Paula Brown 1978-05-24 1
552 1 Steven Jones 1974-04-04 2
553 0 Jane Doe 1978-05-24 3
554 1 James Smith 1980-10-20 4
555 ==== ========= ======== ========== ==
556
557
558 *Pet Table*
559
560 ::
561
562 Filter 1 - by regex expression matching [include]: '^\d+' (include lines that start with a number)
563 Filter 2 - append a line number column:
564 Filter 3 - by regex expression matching [exclude]: '^0\t' (exclude lines with no pets)
565 Filter 4 - normalize list columns[5,6]:
566
567 Table: Pet
568 Columns: ,,,,PetName,PetType,id
569
570 ======== ======== ==
571 PetName PetType id
572 ======== ======== ==
573 Rex dog 1
574 Fluff cat 1
575 Allie cat 2
576 Spot 4
577 ======== ======== ==
578
579
580 Query: SELECT FirstName,LastName,PetName FROM People join Pet on People.id = Pet.id WHERE PetType = 'cat';
581
582 Result:
583
584 ========= ======== ========
585 FirstName LastName PetName
586 ========= ======== ========
587 Paula Brown Fluff
588 Steven Jones Allie
589 ========= ======== ========
534 590
535 .. _Regular_expression: https://docs.python.org/release/2.7/library/re.html 591 .. _Regular_expression: https://docs.python.org/release/2.7/library/re.html
536 .. _SQLite: http://www.sqlite.org/index.html 592 .. _SQLite: http://www.sqlite.org/index.html
537 593
538 ]]></help> 594 ]]></help>