If I issue the following query:
SELECT t_time,facility FROM system_log,(SELECT time FROM system_log
ORDER BY facility) AS x WHERE system_log.time=x.time
I get an error: "Column name 'FACILITY' is in more than one table in the
FROM list."
Why does it consider Facility to be a column in
On 27/09/2021 18:23, John English wrote:
I'll try the temporary table approach as soon as I get a minute, and
will let you know what happens.
I'm finally getting somewhere. Having (a) moved the row counting out to
a separate query, (b) renamed columns in the table to match what my code
A couple more data points, from testing different variants of the inner
select:
1) SELECT time FROM system_log
ORDER BY time DESC NULLS LAST FETCH NEXT 20 ROWS ONLY;
419ms, "Index Scan ResultSet for SYSTEM_LOG using index LOG_INDEX at
read uncommitted isolation level using share row
On Tue, 28 Sep 2021, 17:59 Rick Hillegas, wrote:
> On 9/28/21 4:51 AM, John English wrote:
>
> If I issue the following query:
>
> SELECT t_time,facility FROM system_log,(SELECT time FROM system_log ORDER
> BY facility) AS x WHERE system_log.time=x.time
>
> I get an error: "Column name
On 9/28/21 4:51 AM, John English wrote:
If I issue the following query:
SELECT t_time,facility FROM system_log,(SELECT time FROM system_log
ORDER BY facility) AS x WHERE system_log.time=x.time
I get an error: "Column name 'FACILITY' is in more than one table in
the FROM list."
Why does it
On Tue, 28 Sep 2021, 17:52 Rick Hillegas, wrote:
> Glad that you have made progress on this puzzle. One comment inline...
>
> On 9/28/21 4:10 AM, John English wrote:
> > The WHERE clause seems to prevent the index from being used.
> The index is not usable in this query because username is not
Glad that you have made progress on this puzzle. One comment inline...
On 9/28/21 4:10 AM, John English wrote:
A couple more data points, from testing different variants of the
inner select:
1) SELECT time FROM system_log
ORDER BY time DESC NULLS LAST FETCH NEXT 20 ROWS ONLY;
419ms,
