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How to split the name string in mysql?

Posted by: admin November 1, 2017 Leave a comment

Questions:

How to split the name string in mysql ?

E.g.:

name
-----
Sachin ramesh tendulkar
Rahul dravid

Split the name like firstname,middlename,lastname:

firstname   middlename    lastname
---------  ------------   ------------
sachin     ramesh         tendulkar
rahul      dravid
Answers:

I’ve seperated this answer into two(2) methods. The first method will separate your fullname field into first, middle, and last names. The middle name will show as NULL if there is no middle name.

SELECT
   SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 1), ' ', -1) AS first_name,
   If(  length(fullname) - length(replace(fullname, ' ', ''))>1,  
       SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 2), ' ', -1) ,NULL) 
           as middle_name,
   SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 3), ' ', -1) AS last_name
FROM registeredusers

This second method considers the middle name as part of the lastname. We will only select a firstname and lastname column from your fullname field.

SELECT
   SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 1), ' ', -1) AS first_name,
    TRIM( SUBSTR(fullname, LOCATE(' ', fullname)) ) AS last_name
FROM registeredusers

There’s a bunch of cool things you can do with substr, locate, substring_index, etc. Check the manual for some real confusion. http://dev.mysql.com/doc/refman/5.0/en/string-functions.html

Questions:
Answers:

Well, nothing I used worked, so I decided creating a real simple split function, hope it helps:

    DECLARE inipos INTEGER;
    DECLARE endpos INTEGER;
    DECLARE maxlen INTEGER;
    DECLARE item VARCHAR(100);
    DECLARE delim VARCHAR(1);

    SET delim = '|';
    SET inipos = 1;
    SET fullstr = CONCAT(fullstr, delim);
    SET maxlen = LENGTH(fullstr);

    REPEAT
        SET endpos = LOCATE(delim, fullstr, inipos);
        SET item =  SUBSTR(fullstr, inipos, endpos - inipos);

        IF item <> '' AND item IS NOT NULL THEN           
            USE_THE_ITEM_STRING;
        END IF;
        SET inipos = endpos + 1;
    UNTIL inipos >= maxlen END REPEAT;

Questions:
Answers:

Here is the split function I use:

--
-- split function
--    s   : string to split
--    del : delimiter
--    i   : index requested
--

DROP FUNCTION IF EXISTS SPLIT_STRING;

DELIMITER $

CREATE FUNCTION 
   SPLIT_STRING ( s VARCHAR(1024) , del CHAR(1) , i INT)
   RETURNS VARCHAR(1024)
   DETERMINISTIC -- always returns same results for same input parameters
    BEGIN

        DECLARE n INT ;

        -- get max number of items
        SET n = LENGTH(s) - LENGTH(REPLACE(s, del, '')) + 1;

        IF i > n THEN
            RETURN NULL ;
        ELSE
            RETURN SUBSTRING_INDEX(SUBSTRING_INDEX(s, del, i) , del , -1 ) ;        
        END IF;

    END
$

DELIMITER ;


SET @agg = "G1;G2;G3;G4;" ;

SELECT SPLIT_STRING(@agg,';',1) ;
SELECT SPLIT_STRING(@agg,';',2) ;
SELECT SPLIT_STRING(@agg,';',3) ;
SELECT SPLIT_STRING(@agg,';',4) ;
SELECT SPLIT_STRING(@agg,';',5) ;
SELECT SPLIT_STRING(@agg,';',6) ;

Questions:
Answers:

You can use bewlo one also:

SELECT SUBSTRING_INDEX(Name, ' ', 1) AS fname,
SUBSTRING_INDEX(SUBSTRING_INDEX(Name,' ', 2), ' ',-1) AS mname,
SUBSTRING_INDEX(Name, ' ', -1) as lname FROM mytable;

Questions:
Answers:

To get the rest of the string after the second instance of the space delimiter

SELECT
   SUBSTRING_INDEX(SUBSTRING_INDEX('Sachin ramesh tendulkar', ' ', 1), ' ', -1) AS first_name, 
       SUBSTRING_INDEX(SUBSTRING_INDEX('Sachin ramesh tendulkar', ' ', 2), ' ', -1) 
           AS middle_name,
   SUBSTRING('Sachin ramesh tendulkar',LENGTH(SUBSTRING_INDEX('Sachin ramesh tendulkar', ' ', 2))+1) AS last_name

Questions:
Answers:
SELECT
    p.fullname AS 'Fullname',
    SUBSTRING_INDEX(p.fullname, ' ', 1) AS 'Firstname',
    SUBSTRING(p.fullname, LOCATE(' ',p.fullname), 
        (LENGTH(p.fullname) - (LENGTH(SUBSTRING_INDEX(p.fullname, ' ', 1)) + LENGTH(SUBSTRING_INDEX(p.fullname, ' ', -1))))
    ) AS 'Middlename',
    SUBSTRING_INDEX(p.fullname, ' ', -1) AS 'Lastname',
    (LENGTH(p.fullname) - LENGTH(REPLACE(p.fullname, ' ', '')) + 1) AS 'Name Qt'
FROM people AS p
LIMIT 100; 

Explaining:

Find firstname and lastname are easy, you have just to use SUBSTR_INDEX function
Magic happens in middlename, where was used SUBSTR with Locate to find the first space position and LENGTH of fullname – (LENGTH firstname + LENGTH lastname) to get all the middlename.

Note that LENGTH of firstname and lastname were calculated using SUBSTR_INDEX

Questions:
Answers:

There is no string split function in MySQL. so you have to create your own function. Use below link.This will help you

http://blog.fedecarg.com/2009/02/22/mysql-split-string-function/

Questions:
Answers:

To get the rest of the string after the second instance of the space delimiter:

SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(MsgRest, ' ', 1), ' ', -1) AS EMailID
,  SUBSTRING_INDEX(SUBSTRING_INDEX(MsgRest, ' ', 2), ' ', -1) AS DOB
,  IF(
    LOCATE(' ', `MsgRest`) > 0,
    TRIM(SUBSTRING(SUBSTRING(`MsgRest`, LOCATE(' ', `MsgRest`) +1), 
         LOCATE(' ', SUBSTRING(`MsgRest`, LOCATE(' ', `MsgRest`) +1)) +1)),
    NULL
) AS Person
FROM inbox

Questions:
Answers:

You could use the common_schema and use the tokenize function. For more information about this, follow the links. Your code the would end up like:

call tokenize(name, ' ');

However, be aware that a space is not a reliable separator for first and last name. E.g. In Spain it is common to have two last names.

Questions:
Answers:

DELIMITER $$

DROP FUNCTION IF EXISTS `split_name`$$

CREATE FUNCTION split_name (p_fullname TEXT, p_part INTEGER)
RETURNS TEXT
    READS SQL DATA
BEGIN
    DECLARE v_words INT UNSIGNED;
    DECLARE v_name TEXT;

    SET p_fullname=RTRIM(LTRIM(p_fullname));

    SET v_words=(SELECT SUM(LENGTH(p_fullname) - LENGTH(REPLACE(p_fullname, ' ', ''))+1));

    IF v_words=1 THEN 
        IF p_part=1 THEN
            SET v_name=p_fullname;
        ELSEIF p_part=2 THEN
            SET v_name=NULL;
        ELSEIF p_part=3 THEN
            SET v_name=NULL;
        ELSE
            SET v_name=NULL;
        END IF; 
    ELSEIF v_words=2 THEN 
        IF p_part=1 THEN
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=2 THEN
            SET v_name=SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1);
        ELSEIF p_part=3 THEN
            SET v_name=NULL;
        ELSE
            SET v_name=NULL;
        END IF; 
    ELSEIF v_words=3 THEN 
        IF p_part=1 THEN
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=2 THEN
            SET p_fullname=SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1);
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=3 THEN
            SET p_fullname=REVERSE (SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1));
            SET p_fullname=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
            SET v_name=REVERSE(p_fullname);
        ELSE
            SET v_name=NULL;
        END IF; 
    ELSEIF v_words>3 THEN 
        IF p_part=1 THEN
            SET v_name=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
        ELSEIF p_part=2 THEN
            SET p_fullname=REVERSE(SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1));
            SET p_fullname=SUBSTRING(p_fullname, LOCATE(' ', p_fullname,SUBSTRING_INDEX(p_fullname,' ',1)+1) + 1);
            SET v_name=REVERSE(p_fullname);
        ELSEIF p_part=3 THEN
            SET p_fullname=REVERSE (SUBSTRING(p_fullname, LOCATE(' ', p_fullname) + 1));
            SET p_fullname=SUBSTRING(p_fullname, 1, LOCATE(' ', p_fullname) - 1);
            SET v_name=REVERSE(p_fullname);
        ELSE
            SET v_name=NULL;
        END IF;
    ELSE
        SET v_name=NULL;
    END IF;
 RETURN v_name; 
END;

SELECT split_name('Md. Obaidul Haque Sarker',1) AS first_name,
split_name('Md. Obaidul Haque Sarker',2) AS middle_name,
split_name('Md. Obaidul Haque Sarker',3) AS last_name

Questions:
Answers:

First Create Procedure as Below:

CREATE DEFINER=`root`@`%` PROCEDURE `sp_split`(str nvarchar(6500), dilimiter varchar(15), tmp_name varchar(50))
BEGIN

    declare end_index   int;
    declare part        nvarchar(6500);
    declare remain_len  int;

    set end_index      = INSTR(str, dilimiter);

    while(end_index   != 0) do

        /* Split a part */
        set part       = SUBSTRING(str, 1, end_index - 1);

        /* insert record to temp table */
        call `sp_split_insert`(tmp_name, part);

        set remain_len = length(str) - end_index;
        set str = substring(str, end_index + 1, remain_len);

        set end_index  = INSTR(str, dilimiter);

    end while;

    if(length(str) > 0) then

        /* insert record to temp table */
        call `sp_split_insert`(tmp_name, str);

    end if;

END

After that create procedure as below:

CREATE DEFINER=`root`@`%` PROCEDURE `sp_split_insert`(tb_name varchar(255), tb_value nvarchar(6500))
BEGIN
    SET @sql = CONCAT('Insert Into ', tb_name,'(item) Values(?)'); 
    PREPARE s1 from @sql;
    SET @paramA = tb_value;
    EXECUTE s1 USING @paramA;
END

How call test

CREATE DEFINER=`root`@`%` PROCEDURE `test_split`(test_text nvarchar(255))
BEGIN

    create temporary table if not exists tb_search
        (
            item nvarchar(6500)
        );

    call sp_split(test_split, ',', 'tb_search');

    select * from tb_search where length(trim(item)) > 0;

    drop table tb_search;

END


call `test_split`('Apple,Banana,Mengo');

Questions:
Answers:
CREATE DEFINER=`root`@`localhost` FUNCTION `getNameInitials`(`fullname` VARCHAR(500), `separator` VARCHAR(1)) RETURNS varchar(70) CHARSET latin1
    DETERMINISTIC
BEGIN
DECLARE `result` VARCHAR(500) DEFAULT '';
DECLARE `position` TINYINT;



SET `fullname` = TRIM(`fullname`);

SET `position` = LOCATE(`separator`, `fullname`);

IF NOT `position`
THEN RETURN LEFT(`fullname`,1);
END IF;

SET `fullname` = CONCAT(`fullname`,`separator`);
SET `result` = LEFT(`fullname`, 1);

cycle: LOOP
    SET `fullname` = SUBSTR(`fullname`, `position` + 1);
    SET `position` = LOCATE(`separator`, `fullname`);

    IF NOT `position` OR NOT LENGTH(`fullname`)
    THEN LEAVE cycle;
    END IF;

    SET `result` = CONCAT(`result`,LEFT(`fullname`, 1));
   -- SET `result` = CONCAT_WS(`separator`, `result`, `buffer`);
END LOOP cycle;

RETURN upper(`result`);
END

1.Execute this function in mysql.
2.this will create a function. Now you can use this function anywhere you want.

 SELECT `getNameInitials`('Kaleem Ul Hassan', ' ') AS `NameInitials`;

3. The above getNameInitails first parameter is string you want to filter and second is the spectator character on which you want to separate you string.
4. In above example ‘Kaleem Ul Hassan’ is name and i want to get initials and my separator is space ‘ ‘.