Hi all,
I just switched from MS SQL to PostgreSQL on project and have question about
double-quoting names of fields/tables
regarding to performance.
In MSSQL I had something like:
SELECT Column1,Column2 from MyTable
In PgSQL I write:
SELECT Column1, Column2 from MyTable
Which is fine and
Jozef Ševčík wrote:
Hi all,
I just switched from MS SQL to PostgreSQL on project and have
question about double-quoting names of fields/tables regarding to
performance.
If the cost of quoting column-names is a significant part of your query
costs, you must have some very fast queries. I
pozdravom / Best regards,
Jozef Ševčík
[EMAIL PROTECTED]
+420 608 782 813
-Original Message-
From: Richard Huxton [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 09, 2008 5:49 PM
To: Jozef Ševčík
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Quoting table/column names vs performance
Jozef Ševčík wrote:
Richard,
thanks for the answer.
In fact, I double-quoted identifiers only because PgSQL forced me to do so
when using capitalized letters in table/column name.
Well, if you don't quote them they get folded to lower-case and you get
case-insensitive matching.
CREATE
On Apr 9, 2008, at 5:27 PM, Jozef Ševčík wrote:
In MSSQL I had something like:
SELECT Column1,Column2 from MyTable
In PgSQL I write:
SELECT “Column1”, “Column2” from “MyTable”
Which is fine and working, I have no doubt about it. I’m just
guessing if this does not affect performance
in any
Subject: Re: [GENERAL] Quoting table/column names vs performance
On Apr 9, 2008, at 5:27 PM, Jozef Ševčík wrote:
In MSSQL I had something like:
SELECT Column1,Column2 from MyTable
In PgSQL I write:
SELECT “Column1”, “Column2” from “MyTable”
Which is fine and working, I have no doubt about
,
Jozef Ševčík
[EMAIL PROTECTED]
+420 608 782 813
-Original Message-
From: Richard Huxton [mailto:[EMAIL PROTECTED]
Sent: Wednesday, April 09, 2008 6:57 PM
To: Jozef Ševčík
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] Quoting table/column names vs performance
Jozef Ševčík
Jozef Ševčík wrote:
So it all depends on how table is exactly created, thank you.
A last question - is there any way how to 'switch' this for
table without re-creating table again ?
ALTER TABLE MixedCase RENAME TO lowercase;
The double quotes are optional on all lower case identifiers.
On Wed, 9 Apr 2008 19:11:57 +0200
Alban Hertroys [EMAIL PROTECTED] wrote:
On Apr 9, 2008, at 5:27 PM, Jozef Ševčík wrote:
In MSSQL I had something like:
SELECT Column1,Column2 from MyTable
In PgSQL I write:
SELECT “Column1”, “Column2” from “MyTable”
Which is fine and working, I
