Re: SQL CASE WHEN THEN ELSE END

Do you perhaps mean:

  SELECT a.a,
         a.c,
         a.e,
         b.g,
         b.h,
         b.i,
         coalesce((
                   SELECT 'YES'
                     FROM t2
                    WHERE wYear == a.c
                      AND pid == a.a
                  ),  'NO') AS digital
    FROM t0 as a, t1 as b
   WHERE a.a == b.f
     AND a.idate == (SELECT MAX(idate) from t0 where a = a.a)
     AND b.idate == (SELECT MAX(idate) from t1 where f = a.a)
     AND a.a IN (SELECT pid FROM t2)
     AND a.c == 2020
;

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>-----Original Message-----
>From: sqlite-users <[email protected]> On
>Behalf Of Jose Isaias Cabrera
>Sent: Sunday, 26 January, 2020 19:44
>To: SQLite mailing list <[email protected]>
>Subject: [sqlite] SQL CASE WHEN THEN ELSE END
>
>
>Greetings!
>
>I am getting the wrong output, and I don't know how to get it to work.
>Please take a look at the following (Pardon the lengthy data):
>create table t0 (n INTEGER PRIMARY KEY, a, b, c, d, e, idate);
>insert into t0 (a, b, c, d, e, idate) values ('p001', 1, 2019, 'n', 4,
>'2019-02-11');
>insert into t0 (a, b, c, d, e, idate) values ('p002', 2, 2019, 'n', 4,
>'2019-02-11');
>insert into t0 (a, b, c, d, e, idate) values ('p003', 3, 2019, 'n', 4,
>'2019-02-11');
>insert into t0 (a, b, c, d, e, idate) values ('p004', 4, 2019, 'y', 4,
>'2019-02-11');
>insert into t0 (a, b, c, d, e, idate) values ('p005', 5, 2019, 'y', 4,
>'2019-02-11');
>insert into t0 (a, b, c, d, e, idate) values ('p001', 10, 2020, 'n', 4,
>'2019-02-12');
>insert into t0 (a, b, c, d, e, idate) values ('p002', 2, 2019, 'n', 4,
>'2019-02-12');
>insert into t0 (a, b, c, d, e, idate) values ('p003', 3, 2019, 'y', 4,
>'2019-02-12');
>insert into t0 (a, b, c, d, e, idate) values ('p004', 4, 2019, 'y', 4,
>'2019-02-12');
>insert into t0 (a, b, c, d, e, idate) values ('p005', 5, 2019, 'y', 4,
>'2019-02-12');
>insert into t0 (a, b, c, d, e, idate) values ('p001', 10, 2020, 'n', 4,
>'2019-02-13');
>insert into t0 (a, b, c, d, e, idate) values ('p002', 2, 2019, 'n', 4,
>'2019-02-13');
>insert into t0 (a, b, c, d, e, idate) values ('p003', 3, 2020, 'y', 4,
>'2019-02-13');
>insert into t0 (a, b, c, d, e, idate) values ('p004', 5, 2019, 'n', 4,
>'2019-02-13');
>insert into t0 (a, b, c, d, e, idate) values ('p005', 5, 2020, 'y', 8,
>'2019-02-13');
>
>create table t1 (n INTEGER PRIMARY KEY, f, g, h, i, j, idate);
>insert into t1 (f, g, h, i, j, idate) values ('p001', 1, 4, 'n', 4,
>'2019-02-11');
>insert into t1 (f, g, h, i, j, idate) values ('p002', 2, 3, 'n', 4,
>'2019-02-11');
>insert into t1 (f, g, h, i, j, idate) values ('p003', 3, 2, 'n', 4,
>'2019-02-11');
>insert into t1 (f, g, h, i, j,  idate) values ('p004', 4, 5, 'y', 4,
>'2019-02-11');
>insert into t1 (f, g, h, i, j, idate) values ('p005', 5, 3, 'y', 4,
>'2019-02-11');
>insert into t1 (f, g, h, i, j, idate) values ('p001', 10, 2, 'n', 4,
>'2019-02-12');
>insert into t1 (f, g, h, i, j, idate) values ('p002', 2, 6, 'n', 4,
>'2019-02-12');
>insert into t1 (f, g, h, i, j, idate) values ('p003', 3, 7, 'y', 4,
>'2019-02-12');
>insert into t1 (f, g, h, i, j, idate) values ('p004', 4, 1, 'y', 4,
>'2019-02-12');
>insert into t1 (f, g, h, i, j, idate) values ('p005', 5, 2, 'y', 4,
>'2019-02-12');
>insert into t1 (f, g, h, i, j, idate) values ('p001', 10, 1, 'n', 4,
>'2019-02-13');
>insert into t1 (f, g, h, i, j, idate) values ('p002', 2, 8, 'n', 4,
>'2019-02-13');
>insert into t1 (f, g, h, i, j, idate) values ('p003', 3, 9, 'y', 4,
>'2019-02-13');
>insert into t1 (f, g, h, i, j, idate) values ('p004', 5, 3, 'n', 4,
>'2019-02-13');
>insert into t1 (f, g, h, i, j, idate) values ('p005', 5, 3, 'y', 8,
>'2019-02-13');
>
>create table t2 (pid, WYear);
>insert into t2 values ('p001', 2019);
>insert into t2 values ('p003', 2019);
>insert into t2 values ('p004', 2019);
>insert into t2 values ('p002', 2020);
>insert into t2 values ('p003', 2020);
>insert into t2 values ('p005', 2020);
>
>When I run this SELECT,
>
>SELECT a.a, a.c, a.e, b.g, b.h, b.i,
>(
>    CASE
>    (
>          SELECT WYear FROM t2 WHERE pid = a.a
>    )
>    WHEN c.WYear = 2020 THEN “YES”
>    ELSE “NO” END
>) AS DIGITAL
>FROM t0 as a, t1 as b, t2 as c
>WHERE a.a = b.f and a.a = c.pid
>AND a.c = 2020
>AND a.idate = (SELECT MAX(idate) from t0 where a = a.a)
>AND b.idate = (SELECT MAX(idate) from t1 where f = a.a)
>GROUP BY a.a
>;
>
>I get,
>
>p001|2020|4|10|1|n|NO
>p003|2020|4|3|9|y|NO
>p005|2020|8|5|3|y|NO
>
>I expected this,
>
>p001|2020|4|10|1|n|NO
>p003|2020|4|3|9|y|YES
>p005|2020|8|5|3|y|YES
>
>I've tried a few changes, but nothing seems to work.  Thoughts please?
>thanks.
>
>josé
>_______________________________________________
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>[email protected]
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