Hi all,
I've been surprised that the following syntax doesn't work and returns
"3 values for 4 columns" diagnose message. I'm just asking by curiosity.
INSERT INTO t (a, b, c, d) VALUES ('aa', 'bb', (SELECT c, d FROM t
WHERE <cond>));
with <cond> guaranteed to select exactly one row.
I thought (probably naively) that the SELECT would be considered
returning _two_ values.
If I read the SQLite syntax diagrams well, it should work.
In such case, is there a less pedestrian way to achieve the result than
INSERT INTO t (a, b, c, d)
VALUES ('aa',
'bb',
(SELECT c FROM t WHERE <cond>),
(SELECT d FROM t WHERE <cond>));
I know that such dupplication of fields is not the best design, but in
the occurence, this small (100-200 rows) table only sees few inserts a
year but heavy lookup. I tend to make the lookup simpler.
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