One approach might be something like this:
INSERT INTO t (a, b, c, d, e, idate)
SELECT 'p006',
Coalesce(b, 1),
Coalesce(c, 2),
'y',
Coalesce(e, 4),
'2019-20-12'
FROM (SELECT 1)
LEFT JOIN
(SELECT a, b, c, e FROM t WHERE a = 'p006' ORDER BY idate DESC LIMIT 1);
A slightly more succinct (but not universal) way:
Note: see point 1 of
https://www.sqlite.org/quirks.html#aggregate_queries_can_contain_non_aggregate_result_columns_that_are_not_in_the_group_by_clause
INSERT INTO t (a, b, c, d, e, idate)
SELECT IfNull('p006', Max(idate)),
IfNull(b, 1),
IfNull(c, 2),
'y',
IfNull(e, 4),
'2019-20-12'
FROM t
WHERE a = 'p006';
On Sat, Nov 16, 2019 at 8:04 AM Jose Isaias Cabrera <[email protected]> wrote:
>
>
> Doug, on Friday, November 15, 2019 11:42 AM, wrote...
> >
> > WRT Jose's original context, and just for my enlightment, what happens with
> > the following:
> >
> > insert into t (a, b, c, d, e, idate)
> > SELECT a, b, c, 'y', e, '2019-02-12' FROM t WHERE a = 'p999';
> >
> > where p999 does not define a record? Is a new record inserted with values
> > of a,b,c, and e null?
>
> Ok, I promise that this will be the last email on this for me:
>
> I just came to my senses, and sometimes, I need to insert when the 'a' value
> does not exists, as Doug just brought to my attention. So, I am trying to
> insert a record with two new values using the last existing 'a'. If a does
> not exists, then I need to add that record with the two values. I have been
> trying a few INSERT with CASEs, but nothing is working. I know one of you
> will make it look easy, but this is what I have done as of now:
> create table t (n INTEGER PRIMARY KEY, a, b, c, d, e, idate);
> insert into t (a, b, c, d, e, idate) values ('p001', 1, 2, 'n', 4,
> '2019-02-11');
> insert into t (a, b, c, d, e, idate) values ('p002', 2, 2, 'n', 4,
> '2019-02-11');
> insert into t (a, b, c, d, e, idate) values ('p003', 3, 2, 'n', 4,
> '2019-02-11');
> insert into t (a, b, c, d, e, idate) values ('p004', 4, 2, 'y', 4,
> '2019-02-11');
> insert into t (a, b, c, d, e, idate) values ('p005', 5, 2, 'y', 4,
> '2019-02-11');
> select * from t;
> 1|p001|1|2|n|4|2019-02-11
> 2|p002|2|2|n|4|2019-02-11
> 3|p003|3|2|n|4|2019-02-11
> 4|p004|4|2|y|4|2019-02-11
> 5|p005|5|2|y|4|2019-02-11
>
> I have tried various combination of the following,
>
> insert into t (a, b, c, d, e, idate) VALUES
> (
> CASE
> SELECT a from t WHERE a = 'p006' idate desc limit 1
> WHEN a = NULL
> THEN 'p006',1,2,'y',4,'2019-02-12'
> ELSE SELECT a, b, c, 'y', e, '2019-20-12' from t WHERE a = 'p006' idate
> desc limit 1
> END
> );
> Error: near "SELECT": syntax error
> sqlite>
>
> But, different syntax error have popped. Any help would be greatly
> appreciated. Thanks.
>
> josé
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