Bagaimanakah saya boleh menghuraikan nama pertama, tengah dan akhir dengan cekap daripada satu medan 'nama penuh' dalam SQL, mengendalikan pelbagai ketidakkonsistenan data dan kes khas?

Pasing Nama Pertama, Tengah dan Akhir daripada Medan Nama Penuh menggunakan SQL

Apabila memproses data, selalunya perlu mengasingkan nama ke dalam bahagian konstituen untuk manipulasi yang lebih mudah. Dalam kes ini, kita perlu mengeluarkan nama pertama, tengah dan akhir daripada medan 'nama penuh' sambil mengambil kira variasi data biasa.

Penyelesaian Cekap dengan Ketepatan 90%

Contoh yang disediakan menyediakan penyelesaian praktikal yang mengendalikan kebanyakan kes dengan tahap ketepatan yang tinggi:

SELECT
  FIRST_NAME.ORIGINAL_INPUT_DATA,
  FIRST_NAME.TITLE,
  FIRST_NAME.FIRST_NAME,
  CASE
    WHEN 0 = CHARINDEX(' ', FIRST_NAME.REST_OF_NAME)
    THEN NULL  -- No more spaces? Assume rest is last name
    ELSE SUBSTRING(FIRST_NAME.REST_OF_NAME, 1, CHARINDEX(' ', FIRST_NAME.REST_OF_NAME) - 1)
  END AS MIDDLE_NAME,
  SUBSTRING(FIRST_NAME.REST_OF_NAME, 1 + CHARINDEX(' ', FIRST_NAME.REST_OF_NAME), LEN(FIRST_NAME.REST_OF_NAME)) AS LAST_NAME
FROM
  (
    SELECT
      TITLE.TITLE,
      CASE
        WHEN 0 = CHARINDEX(' ', TITLE.REST_OF_NAME)
        THEN TITLE.REST_OF_NAME -- No space? Return the whole thing
        ELSE SUBSTRING(TITLE.REST_OF_NAME, 1, CHARINDEX(' ', TITLE.REST_OF_NAME) - 1)
      END AS FIRST_NAME,
      CASE
        WHEN 0 = CHARINDEX(' ', TITLE.REST_OF_NAME)
        THEN NULL  -- No spaces at all? Then 1st name is all we have
        ELSE SUBSTRING(TITLE.REST_OF_NAME, CHARINDEX(' ', TITLE.REST_OF_NAME) + 1, LEN(TITLE.REST_OF_NAME))
      END AS REST_OF_NAME,
      TITLE.ORIGINAL_INPUT_DATA
    FROM
      (
        SELECT
          -- If the first three characters are in this list,
          -- then pull it as a "title". Otherwise return NULL for title.
          CASE
            WHEN SUBSTRING(TEST_DATA.FULL_NAME, 1, 3) IN ('MR ', 'MS ', 'DR ', 'MRS')
            THEN LTRIM(RTRIM(SUBSTRING(TEST_DATA.FULL_NAME, 1, 3)))
            ELSE NULL
          END AS TITLE,
          -- If you change the list, don't forget to change it here, too.
          CASE
            WHEN SUBSTRING(TEST_DATA.FULL_NAME, 1, 3) IN ('MR ', 'MS ', 'DR ', 'MRS')
            THEN LTRIM(RTRIM(SUBSTRING(TEST_DATA.FULL_NAME, 4, LEN(TEST_DATA.FULL_NAME))))
            ELSE LTRIM(RTRIM(TEST_DATA.FULL_NAME))
          END AS REST_OF_NAME,
          TEST_DATA.ORIGINAL_INPUT_DATA
        FROM
          (
            SELECT
              -- Trim leading & trailing spaces before trying to process
              -- Disallow extra spaces *within* the name
              REPLACE(REPLACE(LTRIM(RTRIM(FULL_NAME)), '  ', ' '), '  ', ' ') AS FULL_NAME,
              FULL_NAME AS ORIGINAL_INPUT_DATA
            FROM
              (
                -- Replace this block with your actual table
                SELECT 'GEORGE W BUSH' AS FULL_NAME
                UNION SELECT 'SUSAN B ANTHONY' AS FULL_NAME
                UNION SELECT 'ALEXANDER HAMILTON' AS FULL_NAME
                UNION SELECT 'OSAMA BIN LADEN JR' AS FULL_NAME
                UNION SELECT 'MARTIN J VAN BUREN SENIOR III' AS FULL_NAME
                UNION SELECT 'TOMMY' AS FULL_NAME
                UNION SELECT 'BILLY' AS FULL_NAME
              ) RAW_DATA
          ) TEST_DATA
      ) TITLE
  ) FIRST_NAME;

Ini pertanyaan mengenal pasti dan mengalih keluar awalan seperti 'MR', 'MS', 'DR' dan 'MRS' sebagai lajur 'TITLE' yang berasingan, mengendalikan nama yang hilang, berbilang ruang dalam nama dan satu bahagian 'nama penuh' (pertama). nama sahaja).

Mengendalikan Kes Khas

Penyelesaian juga termasuk pengubahsuaian yang menangani kes khas tertentu, seperti medan 'nama penuh' kosong, ruang belakang/terajui, berbilang ruang berturut-turut dan 'nama penuh' yang mengandungi hanya nama pertama:

-- Handle the following special cases:
-- 1 - The NAME field is NULL
-- 2 - The NAME field contains leading / trailing spaces
-- 3 - The NAME field has > 1 consecutive space within the name
-- 4 - The NAME field contains ONLY the first name
-- 5 - Include the original full name in the final output as a separate column, for readability
-- 6 - Handle a specific list of prefixes as a separate "title" column

SELECT
  FIRST_NAME.ORIGINAL_INPUT_DATA,
  FIRST_NAME.TITLE,
  FIRST_NAME.FIRST_NAME,
  CASE
    WHEN 0 = CHARINDEX(' ', FIRST_NAME.REST_OF_NAME)
    THEN NULL  -- No more spaces? Assume rest is last name
    ELSE SUBSTRING(FIRST_NAME.REST_OF_NAME, 1, CHARINDEX(' ', FIRST_NAME.REST_OF_NAME) - 1)
  END AS MIDDLE_NAME,
  SUBSTRING(FIRST_NAME.REST_OF_NAME, 1 + CHARINDEX(' ', FIRST_NAME.REST_OF_NAME), LEN(FIRST_NAME.REST_OF_NAME)) AS LAST_NAME
FROM
  (
    SELECT
      TITLE.TITLE,
      CASE
        WHEN 0 = CHARINDEX(' ', TITLE.REST_OF_NAME)
        THEN TITLE.REST_OF_NAME -- No space? Return the whole thing
        ELSE SUBSTRING(TITLE.REST_OF_NAME, 1, CHARINDEX(' ', TITLE.REST_OF_NAME) - 1)
      END AS FIRST_NAME,
      CASE
        WHEN 0 = CHARINDEX(' ', TITLE.REST_OF_NAME)
        THEN NULL  -- No spaces at all? Then 1st name is all we have
        ELSE SUBSTRING(TITLE.REST_OF_NAME, CHARINDEX(' ', TITLE.REST_OF_NAME) + 1, LEN(TITLE.REST_OF_NAME))
      END AS REST_OF_NAME,
      TITLE.ORIGINAL_INPUT_DATA
    FROM
      (
        SELECT
          -- If the first three characters are in this list,
          -- then pull it as a "title". Otherwise return NULL for title.
          CASE
            WHEN SUBSTRING(TEST_DATA.FULL_NAME, 1, 3) IN ('MR ', 'MS ', 'DR ', 'MRS')
            THEN LTRIM(RTRIM(SUBSTRING(TEST_DATA.FULL_NAME, 1, 3)))
            ELSE NULL
          END AS TITLE,
          -- If you change the list, don't forget to change it here, too.
          CASE
            WHEN SUBSTRING(TEST_DATA.FULL_NAME, 1, 3) IN ('MR ', 'MS ', 'DR ', 'MRS')
            THEN LTRIM(RTRIM(SUBSTRING(TEST_DATA.FULL_NAME, 4, LEN(TEST_DATA.FULL_NAME))))
            ELSE LTRIM(RTRIM(TEST_DATA.FULL_NAME))
          END AS REST_OF_NAME,
          TEST_DATA.ORIGINAL_INPUT_DATA
        FROM
          (
            SELECT
              -- Trim leading & trailing spaces before trying to process
              -- Disallow extra spaces *within* the name
              REPLACE(REPLACE(LTRIM(RTRIM(FULL_NAME)), '  ', ' '), '  ', ' ') AS FULL_NAME,
              FULL_NAME AS ORIGINAL_INPUT_DATA
            FROM
              (
                -- Replace this block with your actual table
                SELECT 'GEORGE W BUSH' AS FULL_NAME
                UNION SELECT 'SUSAN B ANTHONY' AS FULL_NAME
                UNION SELECT 'ALEXANDER HAMILTON' AS FULL_NAME
                UNION SELECT 'OSAMA BIN LADEN JR' AS FULL_NAME
                UNION SELECT 'MARTIN J VAN BUREN SENIOR III' AS FULL_NAME
                UNION SELECT 'TOMMY' AS FULL_NAME
                UNION SELECT 'BILLY' AS FULL_NAME
                UNION SELECT NULL AS FULL_NAME
                UNION SELECT ' ' AS FULL_NAME
                UNION SELECT '    JOHN  JACOB     SMITH' AS FULL_NAME
                UNION SELECT ' DR  SANJAY       GUPTA' AS FULL_NAME
                UNION SELECT 'DR JOHN S HOPKINS' AS FULL_NAME
                UNION SELECT ' MRS  SUSAN ADAMS' AS FULL_NAME
                UNION SELECT ' MS AUGUSTA  ADA   KING ' AS FULL_NAME      
              ) RAW_DATA
          ) TEST_DATA
      ) TITLE
  ) FIRST_NAME;

Atas ialah kandungan terperinci Bagaimanakah saya boleh menghuraikan nama pertama, tengah dan akhir dengan cekap daripada satu medan 'nama penuh' dalam SQL, mengendalikan pelbagai ketidakkonsistenan data dan kes khas?. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!