Memo fields showing chinese characters or symbols instead of actual value when records number reach a certain point - sql

Question

This is my first post here and I am a database newbie. I tried to find an answer, but I'm not sure I understand how it applies to my case.
My access program generates a query with different types of fields (Autonumber, shorttext, memo) which is then used to create a report.
It has been working fine until now, but since the DB has grown I run into a problem.
I use the ID (primary key) IN () the where condition to filter the report. I make a long string that get all the id of the selected records:
WHERE ID IN (1200,1201,1203,1226,1227,1228,1229,...)
When a certain amount of characters in the query is reached (around 4000), I get Chinese characters instead of all the memo fields, and only the memo fields, of the query results (and then in the report).
Is there a limit in the query size? Isn't it 32000 characters?
Why do these characters shows only if I select too many records?
Is there a substite to IN () that could help me reduce the query lengh or should I completely avoid memo fields?
EDIT : That's the query (stripped down a little to be readable) :
SELECT ObjetsLegislatifs.IDobjet, ObjetsLegislatifs.TitreObjet, ObjetsLegislatifs.ContenuObjet
FROM ObjetsLegislatifs
WHERE IDobjet IN(1200,1201,1203,1226,1227,1228,1229,1230,1231,1232,)
GROUP BY ObjetsLegislatifs.IDobjet, ObjetsLegislatifs.TitreObjet, ObjetsLegislatifs.ContenuObjet
ORDER BY ObjetsLegislatifs.IDobjet;
Basicaly, th IDobjet is a autonumber, the "TitreObjet" and "ContenuObjet" are Memos fields.
While IDobjet always shows the proper number, the memo fields start showing chinese when the query is too long, when a certain threshold is reached. I tried with a text field instead in the query and they work fine.

Answer 1

The best thing for you to do is create a temporary table (which is a special type of table - see here) with a single ID column.
When generating the query, you can then insert your ID into this table and join to it instead of using an IN list, something like this:
select a.*
from table a
INNER JOIN temp_table b ON a.ID = b.ID