query pivot with two word with space in column - mysql

Question

my query :
set #sql = NULL;
select
group_concat(distinct
concat(
'max(if(first.study = ''',
study, ''', first.avg_scores, NULL)) as ',
study
)
) into #sql
from `table`;
SET #sql = concat('select first.name,
', #sql, '
from `table` first
join `table` second
on first.name = second.name
group by first.name');
prepare stmt from #sql;
execute stmt;
deallocate prepare stmt;
when data in column "study"
=================================
name | study | avg_scores
=================================
alfa c 75
beta c 70
alfa php 85
beta php 90
and result : its true.
===========================
name | c | php
===========================
alfa 75 85
beta 70 90
the problem when i have data in table like this :
===================================
name | study | avg_scores
===================================
alfa junior c 75
beta junior c 70
alfa junior php 85
beta junior php 90
error :
"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version
for the right syntax to use near 'c,max(if(first.study = 'junior php',
first.avg_scores, NULL)) as junior php ' at line 2: prepare stmt from #sql"
so : how to fix my query ?

Answer 1

The problem is that you need to escape the identifiers, because a column name cannot have a space. The following uses double quotes for the name (you can also use backticks):
set #sql = NULL;
select group_concat(distinct concat('max(if(first.study = ''', study,
''', first.avg_scores, NULL)) as "', study, '"'
---------------------------------------------------------------------^ ----------^
)
) into #sql
from `table`;
SET #sql = concat('select first.name, ', #sql, '
from `table` first join `table` second on first.name = second.name
group by first.name');