MySQL Query to delete entries containing words longer then 10 characters - mysql

Question

I want to search in Wp post(title) column and delete entries which contains words longer then 10 characters but i am unable to find a query to do that. can anyone help?
Edit: I made following SP.
DELIMITER $$
CREATE DEFINER=`root`#`localhost` PROCEDURE `p`(IN `instring` VARCHAR(255))
begin
declare tempstring varchar(10000);
declare idin int;
declare outstring varchar(100);
declare c1 varchar(100);
declare c2 varchar(100);
declare totallength int DEFAULT 0;
declare checkit int;
declare done int;
DECLARE CUR1 CURSOR for SELECT id,post_title FROM wp_posts;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
drop table if exists occursresults;
create table occursresults (col1 varchar(20), col2 varchar(20),totallength int );
open CUR1;
read_loop: LOOP
FETCH CUR1 INTO idin,tempstring;
if done then leave read_loop; end if;
set checkit = 0;
looper: while tempstring is not null and instr(tempstring,' ') > 0 do
set checkit = checkit + 1;
if checkit > 100 then #In case of infinite loop
leave looper;
end if;
set outstring = substr(tempstring,1,instr(tempstring, ' ') - 1);
set tempstring = ltrim(rtrim(replace(tempstring,concat(outstring,' '),'')));
set c1 = substr(outstring,1,instr(outstring, ' ') - 1);
set c2 = replace(outstring,concat(c1,' '),'');
if Length(c2) > 10 then
delete from wp_posts where id=idin;
end if;
if Length(c2) < 10 then
INSERT INTO occursresults (COL1,COL2,totallength) VALUES (c1,c2,Length(c2));
end if;
end while;
select tempstring;
set outstring = tempstring;
set c1 = substr(outstring,1,instr(outstring, ' ') - 1);
set c2 = replace(outstring,concat(c1,' '),'');
if Length(c2) > 10 then
delete from wp_posts where id=idin;
end if;
if Length(c2) < 10 then
INSERT INTO occursresults (COL1,COL2,totallength) VALUES (c1,c2,Length(c2));
end if;
end loop;
close cur1;
end$$
DELIMITER ;
but when i call it. i get this error.
Error
Static analysis:
1 errors were found during analysis.
Missing expression. (near "ON" at position 25)
SQL query: Edit Edit
SET FOREIGN_KEY_CHECKS = ON;
MySQL said: Documentation
2014 - Commands out of sync; you can't run this command now

Answer 1

You can use a regex to identify the rows to delete:
DELETE FROM post
WHERE title RLIKE '[a-zA-Z]{10}'
This defines a word as a sequence of alphabetic characters. You might want to adapt the regex to add more characters if needed (digits, underscore, dash, ...).

Answer 2

you can use CHAR_LENGTH as a function to get the length.
Select:
SELECT
*
FROM
post
WHERE
CHAR_LENGTH(title) > 10;
Delete query:
DELETE FROM post
WHERE
CHAR_LENGTH(title) > 10;
Note: LENGTH function too works but it will calculate in bytes rather than chars more info on this refer this MySQL - length() vs char_length()