hello,
I'm facing an odd problem.
I have a query:
SELECT "Kürzel", "Autor(en)", "Titel"
FROM "tblTitelangaben"
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no
results.. why?
WHERE
"Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber"
ILIKE '%er%';
|| is the same as "OR", is it not?
1 OR 0 = 1
1 OR 1 = 1
0 OR 0 = 0
right?
therefore I should get the same, or more results...
any hints are greatly appreciated!
TIA,
alex
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Hello
|| isn't OR!!
testdb011=> select 'aaaa'||'bbbbbbb';
?column?
-------------
aaaabbbbbbb
This is SQL, not java or C. OR is OR in SQL :->
Pavel
On Thu, 11 Sep 2003, [ISO-8859-1] Alexander Blüm wrote: hello,
I'm facing an odd problem. I have a query:
SELECT "Kürzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
1 OR 0 = 1 1 OR 1 = 1 0 OR 0 = 0 right? therefore I should get the same, or more results...
any hints are greatly appreciated!
TIA, alex
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|| is the string concatenation operator, so what you're doing is
equivalent to using the concatenated values of those fields.
I have no experience with ILIKE, but you might figure out yourself
what's wrong...
HTH,
Csaba.
On Thu, 2003-09-11 at 13:36, Alexander Blüm wrote: hello,
I'm facing an odd problem. I have a query:
SELECT "Kürzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
1 OR 0 = 1 1 OR 1 = 1 0 OR 0 = 0 right? therefore I should get the same, or more results...
any hints are greatly appreciated!
TIA, alex
---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to ma*******@postgresql.org)
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|| is the string concatenation operator, so what you're doing is
equivalent to using the concatenated values of those fields.
I have no experience with ILIKE, but you might figure out yourself
what's wrong...
HTH,
Csaba.
On Thu, 2003-09-11 at 13:36, Alexander Blüm wrote: hello,
I'm facing an odd problem. I have a query:
SELECT "Kürzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
1 OR 0 = 1 1 OR 1 = 1 0 OR 0 = 0 right? therefore I should get the same, or more results...
any hints are greatly appreciated!
TIA, alex
---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to ma*******@postgresql.org)
---------------------------(end of broadcast)---------------------------
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On Thu, 11 Sep 2003, [ISO-8859-1] Alexander Blüm wrote: hello,
I'm facing an odd problem. I have a query:
SELECT "Kürzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
No, it's string concatenation. Also, remember that NULLs are special
a || NULL is NULL. You can use coalesce(field,"") to get an empty string
if field is NULL.
1 OR 0 = 1 1 OR 1 = 1 0 OR 0 = 0 right?
And even for OR, the above isn't true in SQL because of NULLs.
1 | 0 | N
1 1 | 1 | N
0 1 | 0 | N
N N | N | N
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Stephan Szabo wrote: On Thu, 11 Sep 2003, [ISO-8859-1] Alexander Bl?m wrote:
hello,
I'm facing an odd problem. I have a query:
SELECT "K?rzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"K?rzel"||"Monographie-K?rzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"K?rzel"||"Monographie-K?rzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
No, it's string concatenation. Also, remember that NULLs are special a || NULL is NULL. You can use coalesce(field,"") to get an empty string if field is NULL.
1 OR 0 = 1 1 OR 1 = 1 0 OR 0 = 0 right?
And even for OR, the above isn't true in SQL because of NULLs. 1 | 0 | N 1 1 | 1 | N 0 1 | 0 | N N N | N | N
THANK YOU VERY MUCH!!! ;))
that did the deed, exactly as intended!!
now I understand.
thanks again to all of you!
cheers,
alex
---------------------------(end of broadcast)---------------------------
TIP 7: don't forget to increase your free space map settings
On Thu, 11 Sep 2003, [ISO-8859-1] Alexander Blüm wrote: hello,
I'm facing an odd problem. I have a query:
SELECT "Kürzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
No, it's string concatenation. Also, remember that NULLs are special
a || NULL is NULL. You can use coalesce(field,"") to get an empty string
if field is NULL.
1 OR 0 = 1 1 OR 1 = 1 0 OR 0 = 0 right?
And even for OR, the above isn't true in SQL because of NULLs.
1 | 0 | N
1 1 | 1 | N
0 1 | 0 | N
N N | N | N
---------------------------(end of broadcast)---------------------------
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subscribe-nomail command to ma*******@postgresql.org so that your
message can get through to the mailing list cleanly
Stephan Szabo wrote: On Thu, 11 Sep 2003, [ISO-8859-1] Alexander Bl?m wrote:
hello,
I'm facing an odd problem. I have a query:
SELECT "K?rzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"K?rzel"||"Monographie-K?rzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"K?rzel"||"Monographie-K?rzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
No, it's string concatenation. Also, remember that NULLs are special a || NULL is NULL. You can use coalesce(field,"") to get an empty string if field is NULL.
1 OR 0 = 1 1 OR 1 = 1 0 OR 0 = 0 right?
And even for OR, the above isn't true in SQL because of NULLs. 1 | 0 | N 1 1 | 1 | N 0 1 | 0 | N N N | N | N
THANK YOU VERY MUCH!!! ;))
that did the deed, exactly as intended!!
now I understand.
thanks again to all of you!
cheers,
alex
---------------------------(end of broadcast)---------------------------
TIP 7: don't forget to increase your free space map settings
On Thu, 11 Sep 2003, Alexander Blüm wrote: hello,
I'm facing an odd problem. I have a query:
SELECT "Kürzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
No. Any component must not be NULL. Use coalesce("Herausgeber",'') to
ensure it's never NULL.
---------------------------(end of broadcast)---------------------------
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On Thu, 11 Sep 2003, Alexander Blüm wrote: hello,
I'm facing an odd problem. I have a query:
SELECT "Kürzel", "Autor(en)", "Titel" FROM "tblTitelangaben" WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)" ILIKE '%er%';
this works like a charm.
but if I add another ||"something" - which might be emtpy, I get no results.. why?
WHERE "Titel"||"Kürzel"||"Monographie-Kürzel"||"Autor(en)"||"Herausgeber" ILIKE '%er%';
|| is the same as "OR", is it not?
No. Any component must not be NULL. Use coalesce("Herausgeber",'') to
ensure it's never NULL.
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