On 28 Mar 2017, at 11:02pm, Mark Brand <mabr...@mabrand.nl> wrote:

> create temp table t (db, val);
> insert into t select 'temp', 'original';
> 
> create table t (db, val);
> insert into t select 'main', 'original';

Here’s your problem:

SQLite version 3.16.0 2016-11-04 19:09:39
Enter ".help" for usage hints.
sqlite> create temp table t (db, val);
sqlite> insert into t select 'temp', 'original';
sqlite> .schema
CREATE TABLE t (db, val);
sqlite> create table t (db, val);
sqlite> insert into t select 'main', 'original';
sqlite> .schema
CREATE TABLE t (db, val);
CREATE TABLE t (db, val);
sqlite> SELECT * FROM t;
temp|original
main|original
sqlite> SELECT * FROM temp.t;
temp|original
main|original
sqlite> DROP TABLE temp.t;
sqlite> SELECT * FROM t;
sqlite> 

While temp.t exists it gets in the way of main.t.  When you refer to "t" you’re 
talking about temp.t, not main.t.

Simon.
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