My guess ist hat random() is being called once for each expression containing
Y. Using constant values from a regular table works as expected. It is exactly
the bytecode output by EXPLAIN that could help to determine what
happens, but unfortunately you did not post it.
asql> insert into t values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
asql> select y, y<=5, y between 0 and 5, y<6 from t;
y y<=5 y between 0 and 5 y<6
-- - ---
0 1 1 1
1 1 1 1
2 1 1 1
3 1 1 1
4 1 1 1
5 1 1 1
6 0 0 0
7 0 0 0
8 0 0 0
9 0 0 0
-Ursprüngliche Nachricht-
Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] Im
Auftrag von Keith Maxwell
Gesendet: Dienstag, 11. April 2017 10:30
An: SQLite mailing list
Betreff: [sqlite] Unexpected results from <, <= and BETWEEN with a CTE in 3.18.0
sqlite-users,
Can anyone please explain the results of the query below? I have tried create a
very simple test case. In brief returning 9 rows each starting with an integer
between zero and nine. Then check if it less than or equal to five, between
zero and five and then less than six. I expect all of these comparisons to have
the same result. I can't understand the results, and '.explain' isn't any help.
SQLite version 3.18.0 2017-03-28 18:48:43
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
sqlite>
sqlite> WITH
...> t1(X) AS (
...> SELECT 1
...> UNION ALL
...> SELECT X+1 FROM t1
...> LIMIT 9
...> )
...> ,t2(Y) AS (
...> SELECT abs(random() % 10) FROM t1
...> )
...> SELECT Y, Y <= 5, Y BETWEEN 0 AND 5, Y < 6 FROM t2;
7|1|1|0
3|1|0|0
2|1|1|1
2|0|0|1
0|1|1|1
3|1|1|0
5|1|1|0
6|1|1|0
0|1|1|1
sqlite>
Thanks in advance for your assistance.
Kind Regards
Keith Maxwell
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Gunter Hick
Software Engineer
Scientific Games International GmbH
FN 157284 a, HG Wien
Klitschgasse 2-4, A-1130 Vienna, Austria
Tel: +43 1 80100 0
E-Mail: h...@scigames.at
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