Question

I have “puri” and “mailraku” as two temporary tables. How to fix this query? The documentation about “IN” doesn’t mention it.

UPDATE tr_lines_alls
SET ACT_FLG = 0
WHERE IMG_ID IN (puri, mailraku);

The error says:

 Unknown column 'puri' in 'where clause'

Answer 1

IN operator is not for tables, but for lists of values!!
Maybe you need something as:

UPDATE tr_lines_alls
SET ACT_FLG = 0
WHERE IMG_ID IN (
    SELECT * FROM (
        (SELECT yourcolumn FROM puri) UNION 
        (SELECT yourcolumn FROM mailraku)
    ) AS tmp_union
);