You should NOT be relying on column names UNLESS you set them yourself.
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Von: sqlite-users [mailto:[email protected]] Im
Auftrag von petern
Gesendet: Samstag, 08. Juli 2017 21:37
An: SQLite mailing list <[email protected]>
Betreff: [sqlite] VALUES clause quirk or bug?
Why does the choice of data value quotation mark influence the output column
name of the inline VALUES clause? [This quirk was the origin of a recent bug in
a current project.]
sqlite> .version
SQLite 3.19.3 2017-06-08 14:26:16
0ee482a1e0eae22e08edc8978c9733a96603d4509645f348ebf55b579e89636b
sqlite> .header on
sqlite> .mode csv
sqlite> SELECT * FROM (VALUES (1,2),(3,4));
"",:1
1,2
3,4
sqlite> SELECT * FROM (VALUES ("1",2),(3,4));
1,""
1,2
3,4
sqlite> SELECT * FROM (VALUES ('1',2),(3,4));
"",:1
1,2
3,4
I am aware that a less quirky "column<i>" output column naming is available if
the VALUES clause is evaluated directly. See below. However, this form is not
applicable for task at hand, specifying inline constant tables within a query.
sqlite> VALUES ("1",2),(3,4);
column1,column2
1,2
3,4
Yes, I also thought carefully about the WITH clause. See below. While the
WITH clause is natural for brief queries in a few columns, the wordiness an
unnatural order is not helpful for local constant representation in the very
lengthy queries needed for by this particular project.
sqlite> WITH Constants(c1,c2) AS (VALUES ("1",2),(3,4)) SELECT * FROM
Constants;
c1,c2
1,2
3,4
Is there anything I missed? Are there other undocumented tricks of the VALUE
clause that could help or hinder my quest?
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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: [email protected]
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