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I just googled this.
B5 is lower-case mu, BC is upper-case mu
So they are different.
https://www.compart.com/en/unicode/U+00B5
On 17/06/2021 15:26, Martin Bowes wrote:
Yeah, that’s the idea I’ve explored with the user. It’s amazing what you can do with the replace function.
Something a bit more general may still be required as I’m pretty well guaranteed to bump into this elsewhere.
Marty
*From:*Paul A. <paul@ipauland.com>
*Sent:* 17 June 2021 15:21
*To:* info-ingres@lists.planetingres.org
*Subject:* Re: [Info-ingres] Micro-madness
Choose one representation and change the codes, use an insert/modify
rule to force consistency?
On 17/06/2021 14:17, Martin Bowes wrote:
I’m seeing some progress…nvarchar stores Unicode points as UTF-8.
And:
The UTF-8 encoding of mu (U+03BC) is 0xCE 0xBC
https://www.utf8-chartable.de/unicode-utf8-table.pl?start=896&number=128&names=-&utf8=0x
<https://www.utf8-chartable.de/unicode-utf8-table.pl?start=896&number=128&names=-&utf8=0x>
Also the UTF-8 encoding of mu(U+00B5) is 0xC2 0xB5
https://www.utf8-chartable.de/unicode-utf8-table.pl?start=128&number=128&names=-&utf8=0x
<https://www.utf8-chartable.de/unicode-utf8-table.pl?start=128&number=128&names=-&utf8=0x>
So we have two Unicode code points for mu…why I know not.
And I still don’t know how to get them to equate.
Marty
*From:*Tony Douglas <tonyd08068@netscape.net>
<mailto:tonyd08068@netscape.net>
*Sent:* 17 June 2021 14:05
*To:* Martin Bowes <martin.bowes@ndph.ox.ac.uk>
<mailto:martin.bowes@ndph.ox.ac.uk>
*Cc:* info-ingres@lists.planetingres.org
<mailto:info-ingres@lists.planetingres.org>
*Subject:* Re: [Info-ingres] Micro-madness
Unicode…. There be dragons. Might be something to do with
normalisation form - NFC and NFD say how codes can combine to form
different characters - this page
https://www.win.tue.nl/~aeb/linux/uc/nfc_vs_nfd.html
<https://www.win.tue.nl/~aeb/linux/uc/nfc_vs_nfd.html> might help,
or it might not - I was just about getting unconfused with the
terminology of Unicode when I stopped looking at it a few years
ago :( But weird things could happen. Have you tried a UTF8 client
to see what happens (assuming you’ve got an installation where
transliteration is available) ?
Looking forward to seeing how this pans out !
Thanks,
- Tony
Sent from my iPhone
On 17 Jun 2021, at 13:54, Martin Bowes
<martin.bowes@ndph.ox.ac.uk
<mailto:martin.bowes@ndph.ox.ac.uk>> wrote:
Hi All,
Can someone please explain this one…please use small words…
My Linux installation is an ISO-8859-1 charset. We have a
table which has an nvarchar(20) column.
Now the Greek mu symbol is U+00B5, a capital-A with a
circumflex is 00C2, The ¼ is U+00BC, and a capital-I with a
circumflex is U+00CE.
And in _terminal monitor_ connection, how does this work…
select U&'\00c2', U&'\00b5', U&'\00c2\00b5'\g
┌──────┬──────┬──────┐
│col1 │col2 │col3 │
├──────┼──────┼──────┤
│▒ │▒ │µ │
└──────┴──────┴──────┘
(1 row)
select u&'\00ce', u&'\00bc', u&'\00ce\00bc'\g
┌──────┬──────┬──────┐
│col1 │col2 │col3 │
├──────┼──────┼──────┤
│▒ │▒ │μ │
└──────┴──────┴──────┘
(1 row)
So two weird codes have both combined to make a mu. I didn’t
just invent these. I got them from two distinct data sets
which were being compared.
And they are clearly not the same thing.
create table test(id integer1, a nvarchar(20));
insert into test values (1, U&'\00c2\00b5'), (2, U&'\00ce\00bc');
select * from test\g
┌──────┬────────────────────────────────────────┐
│id │a │
├──────┼────────────────────────────────────────┤
│ 1│µ │
│ 2│μ │
└──────┴────────────────────────────────────────┘
(2 rows)
select a, count(1) from test group by a\g
┌────────────────────────────────────────┬─────────────┐
│a │col2 │
├────────────────────────────────────────┼─────────────┤
│µ │ 1│
│μ │ 1│
└────────────────────────────────────────┴─────────────┘
(2 rows)
So could someone please explain this, and also how I can write
some code which will say these two mu’s are the same thing.
Marty
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<div class="moz-cite-prefix">I just googled this.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">B5 is lower-case mu, BC is upper-case
mu<br>
<br>
So they are different.<br>
<br>
<a class="moz-txt-link-freetext" href="
https://www.compart.com/en/unicode/U+00B5">https://www.compart.com/en/unicode/U+00B5</a><br>
<br>
On 17/06/2021 15:26, Martin Bowes wrote:<br>
</div>
<blockquote type="cite"
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378bf1e17535469196004d663242f936@ndph.ox.ac.uk">
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<p class="MsoNormal"><span style="color:#1F497D">Yeah, that’s
the idea I’ve explored with the user. It’s amazing what you
can do with the replace function.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Something a bit
more general may still be required as I’m pretty well
guaranteed to bump into this elsewhere.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Marty<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="mso-fareast-language:EN-GB" lang="EN-US">From:</span></b><span
style="mso-fareast-language:EN-GB" lang="EN-US"> Paul A.
<a class="moz-txt-link-rfc2396E" href="mailto:
paul@ipauland.com"><
paul@ipauland.com></a>
<br>
<b>Sent:</b> 17 June 2021 15:21<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:
info-ingres@lists.planetingres.org">
info-ingres@lists.planetingres.org</a><br>
<b>Subject:</b> Re: [Info-ingres] Micro-madness<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Choose one representation and change the
codes, use an insert/modify rule to force consistency?<br>
<br>
On 17/06/2021 14:17, Martin Bowes wrote:<span
style="font-size:12.0pt;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="color:#1F497D">I’m seeing
some progress…nvarchar stores Unicode points as UTF-8.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">And:</span><o:p></o:p></p>
<p class="MsoPlainText"><span
style="font-size:12.0pt;font-family:"Times New Roman
,serif",serif">The UTF-8 encoding of mu (</span>U+03BC)
<span style="font-size:12.0pt;font-family:"Times New
Roman ,serif",serif">is 0xCE 0xBC</span><o:p></o:p></p>
<p class="MsoPlainText"><span
style="font-size:12.0pt;font-family:"Times New Roman
,serif",serif"><a href="
https://www.utf8-chartable.de/unicode-utf8-table.pl?start=896&number=128&names=-&utf8=0x"
moz-do-not-send="true">
https://www.utf8-chartable.de/unicode-utf8-table.pl?start=896&number=128&names=-&utf8=0x</a></span><o:p></o:p></p>
<p class="MsoPlainText"><span
style="font-size:12.0pt;font-family:"Times New Roman
,serif",serif"> </span><o:p></o:p></p>
<p class="MsoPlainText"><span
style="font-size:12.0pt;font-family:"Times New Roman
,serif",serif">Also the UTF-8 encoding of mu(</span>U+00B5)
is
<span style="font-size:12.0pt;font-family:"Times New
Roman ,serif",serif">0xC2 0xB5</span><o:p></o:p></p>
<p class="MsoPlainText"><span
style="font-size:12.0pt;font-family:"Times New Roman
,serif",serif"><a href="
https://www.utf8-chartable.de/unicode-utf8-table.pl?start=128&number=128&names=-&utf8=0x"
moz-do-not-send="true">
https://www.utf8-chartable.de/unicode-utf8-table.pl?start=128&number=128&names=-&utf8=0x</a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">So we have
two Unicode code points for mu…why I know not.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">And I still
don’t know how to get them to equate.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Marty</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="mso-fareast-language:EN-GB" lang="EN-US">From:</span></b><span
style="mso-fareast-language:EN-GB" lang="EN-US"> Tony
Douglas
<a href="mailto:
tonyd08068@netscape.net"
moz-do-not-send="true"><
tonyd08068@netscape.net></a>
<br>
<b>Sent:</b> 17 June 2021 14:05<br>
<b>To:</b> Martin Bowes <a
href="mailto:
martin.bowes@ndph.ox.ac.uk"
moz-do-not-send="true"><
martin.bowes@ndph.ox.ac.uk></a><br>
<b>Cc:</b> <a
href="mailto:
info-ingres@lists.planetingres.org"
moz-do-not-send="true">
info-ingres@lists.planetingres.org</a><br>
<b>Subject:</b> Re: [Info-ingres] Micro-madness</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Unicode…. There be dragons. Might be
something to do with normalisation form - NFC and NFD say
how codes can combine to form different characters - this
page <a
href="
https://www.win.tue.nl/~aeb/linux/uc/nfc_vs_nfd.html"
moz-do-not-send="true">
https://www.win.tue.nl/~aeb/linux/uc/nfc_vs_nfd.html</a> might
help, or it might not - I was just about getting unconfused
with the terminology of Unicode when I stopped looking at it
a few years ago :( But weird things could happen. Have you
tried a UTF8 client to see what happens (assuming you’ve got
an installation where transliteration is available) ?<o:p></o:p></p>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Looking forward to seeing how this pans
out !<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">- Tony<o:p></o:p></p>
<div>
<p class="MsoNormal">Sent from my iPhone<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><br>
<br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal" style="margin-bottom:12.0pt">On 17
Jun 2021, at 13:54, Martin Bowes <<a
href="mailto:
martin.bowes@ndph.ox.ac.uk"
moz-do-not-send="true">
martin.bowes@ndph.ox.ac.uk</a>>
wrote:<o:p></o:p></p>
</blockquote>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Can someone please explain this
one…please use small words…<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">My Linux installation is an
ISO-8859-1 charset. We have a table which has an
nvarchar(20) column.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Now the Greek mu symbol is U+00B5,
a capital-A with a circumflex is 00C2, The ¼ is
U+00BC, and a capital-I with a circumflex is U+00CE.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">And in <u>terminal monitor</u>
connection, how does this work…<o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">select U&'\00c2', U&'\00b5',
<span style="background:yellow;mso-highlight:yellow">U&'\00c2\00b5'</span>\g</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">┌──────┬──────┬──────┐</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│col1 │col2 │col3 │</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">├──────┼──────┼──────┤</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│▒ │▒ │µ │</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">└──────┴──────┴──────┘</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">(1 row)</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">select u&'\00ce', u&'\00bc',
<span style="background:yellow;mso-highlight:yellow">u&'\00ce\00bc</span>'\g</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">┌──────┬──────┬──────┐</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│col1 │col2 │col3 │</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">├──────┼──────┼──────┤</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│▒ │▒ │μ │</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">└──────┴──────┴──────┘</span><o:p></o:p></p>
<p class="MsoNormal"
style="margin-left:72.0pt;text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">(1 row)</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">So two weird codes have both
combined to make a mu. I didn’t just invent these. I
got them from two distinct data sets which were being
compared.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">And they are clearly not the same
thing.<o:p></o:p></p>
<p class="MsoPlainText"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">create table test(id integer1, a
nvarchar(20));</span><o:p></o:p></p>
<p class="MsoPlainText"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">insert into test values (1,
U&'\00c2\00b5'), (2, U&'\00ce\00bc');</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">select * from test\g</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">┌──────┬────────────────────────────────────────┐</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│id
│a │</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">├──────┼────────────────────────────────────────┤</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│
1│µ │</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│ 2│μ
│</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">└──────┴────────────────────────────────────────┘</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">(2 rows)</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console""> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">select a, count(1) from test group by
a\g</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">┌────────────────────────────────────────┬─────────────┐</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│a
│col2 │</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">├────────────────────────────────────────┼─────────────┤</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│µ
│ 1│</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">│μ
│ 1│</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">└────────────────────────────────────────┴─────────────┘</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:"Lucida
Console"">(2 rows)</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">So could someone please explain
this, and also how I can write some code which will
say these two mu’s are the same thing.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Marty<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">_______________________________________________<br>
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</blockquote>
</div>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:EN-GB"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Info-ingres mailing list<o:p></o:p></pre>
<pre><a href="mailto:
Info-ingres@lists.planetingres.org" moz-do-not-send="true">
Info-ingres@lists.planetingres.org</a><o:p></o:p></pre>
<pre><a href="
https://lists.planetingres.org/mailman/listinfo/info-ingres" moz-do-not-send="true">
https://lists.planetingres.org/mailman/listinfo/info-ingres</a><o:p></o:p></pre>
</blockquote>
<p><o:p> </o:p></p>
</div>
</blockquote>
<p><br>
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