Comment puis-je analyser efficacement les prénoms, prénoms et noms de famille à partir d'un seul champ « nom complet » dans SQL, en gérant diverses incohérences de données et cas particuliers ?

Analyser le prénom, le deuxième prénom et le nom du champ Nom complet à l'aide de SQL

Lors du traitement des données, il est souvent nécessaire de séparer les noms en leur éléments constitutifs pour une manipulation plus facile. Dans ce cas, nous devons extraire le prénom, le deuxième prénom et le nom d'un champ « nom complet » tout en tenant compte des variations courantes des données.

Solution efficace avec une précision de 90 %

L'exemple fourni fournit une solution pratique qui traite la plupart des cas avec un haut degré de précision :

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;

Cette requête identifie et supprime les préfixes tels que « MR », « MS », « DR » et « MRS » en tant que colonnes « TITRE » distinctes, gère les noms manquants, les espaces multiples dans le nom et un « nom complet » en une seule partie (prénom uniquement) .

Gestion des cas particuliers

La solution comprend également une modification qui répond à des cas particuliers spécifiques, comme un vide Champ « nom complet », des espaces de fin/de début, plusieurs espaces consécutifs et un « nom complet » contenant uniquement le prénom :

-- 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;

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