DELIMITER $$

CREATE FUNCTION SPLIT_STR(
  x VARCHAR(255),
  delim VARCHAR(12),
  pos INT
)
RETURNS VARCHAR(255) DETERMINISTIC
BEGIN
    RETURN REPLACE(SUBSTRING(SUBSTRING_INDEX(x, delim, pos),
       LENGTH(SUBSTRING_INDEX(x, delim, pos -1)) + 1),
       delim, '');
END$$

DELIMITER ;

SELECT SPLIT_STR(membername, ' ', 1) as memberfirst,
       SPLIT_STR(membername, ' ', 2) as memberlast
FROM   users;

SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(membername, ' ', 1), ' ', -1) as memberfirst,
       SUBSTRING_INDEX(SUBSTRING_INDEX(membername, ' ', 2), ' ', -1) as memberlast
FROM   users;

SELECT IF(
        LOCATE(' ', `membername`) > 0,
        SUBSTRING(`membername`, 1, LOCATE(' ', `membername`) - 1),
        `membername`
    ) AS memberfirst,
    IF(
        LOCATE(' ', `membername`) > 0,
        SUBSTRING(`membername`, LOCATE(' ', `membername`) + 1),
        NULL
    ) AS memberlast
FROM `user`;

UPDATE `user` SET
    `memberfirst` = IF(
        LOCATE(' ', `membername`) > 0,
        SUBSTRING(`membername`, 1, LOCATE(' ', `membername`) - 1),
        `membername`
    ),
    `memberlast` = IF(
        LOCATE(' ', `membername`) > 0,
        SUBSTRING(`membername`, LOCATE(' ', `membername`) + 1),
        NULL
    );

SELECT
    SUBSTRING_INDEX(`membername`, ' ', 1) AS `memberfirst`,
    SUBSTRING_INDEX(`membername`, ' ', -1) AS `memberlast`
;

SELECT SUBSTRING_INDEX(SUBSTRING_INDEX( `membername` , ' ', 2 ),' ',1) AS b,
SUBSTRING_INDEX(SUBSTRING_INDEX( `membername` , ' ', -1 ),' ',2) AS c FROM `users` WHERE `userid`='1'

UPDATE people_exit SET last_name = SUBSTRING_INDEX(fullname,' ',-1)
UPDATE people_exit SET middle_name = TRIM(SUBSTRING_INDEX(SUBSTRING_INDEX(fullname,last_name,1),' ',-2))
UPDATE people_exit SET middle_name = '' WHERE CHAR_LENGTH(middle_name)>3
UPDATE people_exit SET first_name = SUBSTRING_INDEX(fullname,concat(middle_name,' ',last_name),1)
UPDATE people_exit SET first_name = middle_name WHERE first_name = ''
UPDATE people_exit SET middle_name = '' WHERE first_name = middle_name

SELECT Substring(nameandsurname, 1, Locate(' ', nameandsurname) - 1) AS
       firstname,
       Substring(nameandsurname, Locate(' ', nameandsurname) + 1)    AS lastname
FROM   emp

UPDATE tblAuthorList SET AuthorFirst = SUBSTRING_INDEX(AuthorLast,',',-1) , AuthorLast = SUBSTRING_INDEX(AuthorLast,',',1);

SELECT TRIM(
    IF(
        LOCATE(' ', `name`) > 0,
        LEFT(`name`, LENGTH(`name`) - LOCATE(' ', REVERSE(`name`))),
        `name`
    )
) AS first_name,
TRIM(
    IF(
        LOCATE(' ', `name`) > 0,
        SUBSTRING_INDEX(`name`, ' ', -1) ,
        NULL
    )
) AS last_name
FROM `users`;


UPDATE `users` SET
`first_name` = TRIM(
    IF(
        LOCATE(' ', `name`) > 0,
        LEFT(`name`, LENGTH(`name`) - LOCATE(' ', REVERSE(`name`))),
        `name`
    )
),
`last_name` = TRIM(
    IF(
        LOCATE(' ', `name`) > 0,
        SUBSTRING_INDEX(`name`, ' ', -1) ,
        NULL
    )
);

set last_name=trim(SUBSTRING_INDEX(first_name, ' ', -1)), first_name=trim(SUBSTRING(first_name,1,length(first_name) - length(SUBSTRING_INDEX(first_name, ' ', -1)))) where list_id='$List_ID' and length(first_name)>0 and length(trim(last_name))=0

UPDATE `salary_generation_tbl` SET
    `modified_by` = IF(
        LOCATE('$', `other_salary_string`) > 0,
        SUBSTRING(`other_salary_string`, 1, LOCATE('$', `other_salary_string`) - 1),
        `other_salary_string`
    ),
    `other_salary` = IF(
        LOCATE('$', `other_salary_string`) > 0,
        SUBSTRING(`other_salary_string`, LOCATE('$', `other_salary_string`) + 1),
        NULL
    );

SPLIT_STR(<column>, '<delimiter>', <index>)