


How to Efficiently Parse First, Middle, and Last Names from a Full Name Field in SQL?
Parsing First, Middle, and Last Names from a Full Name in SQL
Problem:
How can we extract the first, middle, and last names from a single fullname field in SQL? This is useful for matching names that are not exact matches on fullname.
Solution:
Let's consider the following practical solution that provides 90% accuracy:
WITH FIRST_NAME AS ( SELECT TITLE.ORIGINAL_INPUT_DATA, TITLE.TITLE, CASE WHEN 0 = CHARINDEX(' ', TITLE.REST_OF_NAME) THEN TITLE.REST_OF_NAME 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 more spaces? assume rest is the last name ELSE SUBSTRING(TITLE.REST_OF_NAME, 1 + CHARINDEX(' ', TITLE.REST_OF_NAME), LEN(TITLE.REST_OF_NAME)) END AS REST_OF_NAME FROM ( SELECT 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, 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 REPLACE(REPLACE(LTRIM(RTRIM(FULL_NAME)), ' ', ' '), ' ', ' ') AS FULL_NAME, FULL_NAME AS ORIGINAL_INPUT_DATA FROM ( 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 ) 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 the 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 FIRST_NAME;
This solution handles the following special cases:
- NULL, leading/trailing spaces, consecutive spaces
- No middle name
- Original fullname as a separate column
- Specific list of prefixes as a separate "title" column
The above is the detailed content of How to Efficiently Parse First, Middle, and Last Names from a Full Name Field in SQL?. For more information, please follow other related articles on the PHP Chinese website!

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