Hello everyone,
I think I've found a bug in various versions of SQLite including the
latest release (3.6.16) relating to column names when using UNION.
Steps to reproduce:
sqlite> CREATE TABLE `tab` (`val` TEXT);
sqlite> INSERT INTO `tab` (`val`) VALUES ('a');
sqlite> .headers ON
sqlite> .mode column
sqlite> SELECT `val` FROM `tab`;
val
----------
a
sqlite> SELECT `tab`.`val` FROM `tab` UNION SELECT 'b';
`tab`.`val`
-----------
a
b
As you can see, the column header is "val" as expected in the first
select, but when a union is introduced, the column header becomes the
literal string specified in the select left of the UNION, "`tab`.`val`".
Additionally, a workaround is to specify the resultant column name
using AS:
sqlite> SELECT `tab`.`val` AS `val` FROM `tab` UNION SELECT 'b';
val
----------
a
b
--
Nathaniel Ekoniak
nathan...@ekoniak.net
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