Обсуждение: [GENERAL] Why is table not found?

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[GENERAL] Why is table not found?

От

Egon Frerich

Дата:

31 января 2017 г., 19:45:20

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Hash: SHA1

I created a db 'Hausrat' with a table "Raum". If I look in pgadmin I
find the the table. In sql field is shown:

> -- Table: "Raum"
>
> -- DROP TABLE "Raum";
>
> CREATE TABLE "Raum"
> (
>   "RaumID" serial NOT NULL, -- Automatisch vergebenes
Identifizierungsmerkmal für den Raum
>   "Raum" character varying(15), -- Bezeichnung des Raums
>   CONSTRAINT "Raum_pkey" PRIMARY KEY ("RaumID")
> )
> WITH (
>   OIDS=FALSE
> );
> ALTER TABLE "Raum"
>   OWNER TO egon;
> COMMENT ON COLUMN "Raum"."RaumID" IS 'Automatisch vergebenes
Identifizierungsmerkmal für den Raum';
> COMMENT ON COLUMN "Raum"."Raum" IS 'Bezeichnung des Raums';
>
>
> -- Index: "Raum_RaumID_idx"
>
> -- DROP INDEX "Raum_RaumID_idx";
>
> CREATE INDEX "Raum_RaumID_idx"
>   ON "Raum"
>   USING btree
>   ("RaumID");
>
But psql tells me "Raum" is not existent:

> egon@xfEinzel ~ $ psql Hausrat
> psql (9.3.15)
> Type "help" for help.
>
> Hausrat=# SELECT * FROM Raum;
> ERROR:  relation "raum" does not exist
> LINE 1: SELECT * FROM Raum;
>                       ^
> Hausrat=#

Why?

Egon

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Re: [GENERAL] Why is table not found?

От

Raymond O'Donnell

Дата:

31 января 2017 г., 19:49:33

On 31/01/17 13:45, Egon Frerich wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I created a db 'Hausrat' with a table "Raum". If I look in pgadmin I
> find the the table. In sql field is shown:
>
>> -- Table: "Raum"
>>
>> -- DROP TABLE "Raum";
>>
>> CREATE TABLE "Raum"
>> (
>>   "RaumID" serial NOT NULL, -- Automatisch vergebenes
> Identifizierungsmerkmal für den Raum
>>   "Raum" character varying(15), -- Bezeichnung des Raums
>>   CONSTRAINT "Raum_pkey" PRIMARY KEY ("RaumID")
>> )
>> WITH (
>>   OIDS=FALSE
>> );
>> ALTER TABLE "Raum"
>>   OWNER TO egon;
>> COMMENT ON COLUMN "Raum"."RaumID" IS 'Automatisch vergebenes
> Identifizierungsmerkmal für den Raum';
>> COMMENT ON COLUMN "Raum"."Raum" IS 'Bezeichnung des Raums';
>>
>>
>> -- Index: "Raum_RaumID_idx"
>>
>> -- DROP INDEX "Raum_RaumID_idx";
>>
>> CREATE INDEX "Raum_RaumID_idx"
>>   ON "Raum"
>>   USING btree
>>   ("RaumID");
>>
> But psql tells me "Raum" is not existent:
>
>> egon@xfEinzel ~ $ psql Hausrat
>> psql (9.3.15)
>> Type "help" for help.
>>
>> Hausrat=# SELECT * FROM Raum;
>> ERROR:  relation "raum" does not exist
>> LINE 1: SELECT * FROM Raum;

Object names are folded to lower-case automatically, unless you enclose
them in double-quotes:

   select * from "Raum";

Ray.



--
Raymond O'Donnell :: Galway :: Ireland
rod@iol.ie

Re: [GENERAL] Why is table not found?

От

"Martijn Tonies $Upscene Productions$"

Дата:

31 января 2017 г., 19:50:40

Hello Egon,

You created the table using delimited identifiers:

"Raum"

which is not the same as

Raum of raum or RAUM

When you use delimited identifiers (eg: "MyTable" instead of MyTable), the
name becomes case sensitive.

When you use SQL, you need to use delimited identifiers:

select * from "Raum"



With regards,

Martijn Tonies
Upscene Productions
http://www.upscene.com

Database Workbench - developer tool for Oracle, MS SQL Server, PostgreSQL,
SQL Anywhere, MySQL, InterBase, NexusDB and Firebird.


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I created a db 'Hausrat' with a table "Raum". If I look in pgadmin I
find the the table. In sql field is shown:

> -- Table: "Raum"
>
> -- DROP TABLE "Raum";
>
> CREATE TABLE "Raum"
> (
>   "RaumID" serial NOT NULL, -- Automatisch vergebenes
Identifizierungsmerkmal für den Raum
>   "Raum" character varying(15), -- Bezeichnung des Raums
>   CONSTRAINT "Raum_pkey" PRIMARY KEY ("RaumID")
> )
> WITH (
>   OIDS=FALSE
> );
> ALTER TABLE "Raum"
>   OWNER TO egon;
> COMMENT ON COLUMN "Raum"."RaumID" IS 'Automatisch vergebenes
Identifizierungsmerkmal für den Raum';
> COMMENT ON COLUMN "Raum"."Raum" IS 'Bezeichnung des Raums';
>
>
> -- Index: "Raum_RaumID_idx"
>
> -- DROP INDEX "Raum_RaumID_idx";
>
> CREATE INDEX "Raum_RaumID_idx"
>   ON "Raum"
>   USING btree
>   ("RaumID");
>
But psql tells me "Raum" is not existent:

> egon@xfEinzel ~ $ psql Hausrat
> psql (9.3.15)
> Type "help" for help.
>
> Hausrat=# SELECT * FROM Raum;
> ERROR:  relation "raum" does not exist
> LINE 1: SELECT * FROM Raum;
>                       ^
> Hausrat=#

Why?

Egon

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Re: [GENERAL] Why is table not found?

От

Rob Sargent

Дата:

31 января 2017 г., 19:52:51

You must quite as "Raum"

> On Jan 31, 2017, at 6:45 AM, Egon Frerich <egon@frerich.eu> wrote:
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> I created a db 'Hausrat' with a table "Raum". If I look in pgadmin I
> find the the table. In sql field is shown:
>
>> -- Table: "Raum"
>>
>> -- DROP TABLE "Raum";
>>
>> CREATE TABLE "Raum"
>> (
>>  "RaumID" serial NOT NULL, -- Automatisch vergebenes
> Identifizierungsmerkmal für den Raum
>>  "Raum" character varying(15), -- Bezeichnung des Raums
>>  CONSTRAINT "Raum_pkey" PRIMARY KEY ("RaumID")
>> )
>> WITH (
>>  OIDS=FALSE
>> );
>> ALTER TABLE "Raum"
>>  OWNER TO egon;
>> COMMENT ON COLUMN "Raum"."RaumID" IS 'Automatisch vergebenes
> Identifizierungsmerkmal für den Raum';
>> COMMENT ON COLUMN "Raum"."Raum" IS 'Bezeichnung des Raums';
>>
>>
>> -- Index: "Raum_RaumID_idx"
>>
>> -- DROP INDEX "Raum_RaumID_idx";
>>
>> CREATE INDEX "Raum_RaumID_idx"
>>  ON "Raum"
>>  USING btree
>>  ("RaumID");
>>
> But psql tells me "Raum" is not existent:
>
>> egon@xfEinzel ~ $ psql Hausrat
>> psql (9.3.15)
>> Type "help" for help.
>>
>> Hausrat=# SELECT * FROM Raum;
>> ERROR:  relation "raum" does not exist
>> LINE 1: SELECT * FROM Raum;
>>                      ^
>> Hausrat=#
>
> Why?
>
> Egon
>
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>
>
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> Sent via pgsql-general mailing list (pgsql-general@postgresql.org)
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Re: [GENERAL] Why is table not found?

От

John McKown

Дата:

31 января 2017 г., 19:53:09

On Tue, Jan 31, 2017 at 7:45 AM, Egon Frerich <egon@frerich.eu> wrote:

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I created a db 'Hausrat' with a table "Raum". If I look in pgadmin I
find the the table. In sql field is shown:

> -- Table: "Raum"
>
> -- DROP TABLE "Raum";
>
> CREATE TABLE "Raum"
> (
> "RaumID" serial NOT NULL, -- Automatisch vergebenes
Identifizierungsmerkmal für den Raum
> "Raum" character varying(15), -- Bezeichnung des Raums
> CONSTRAINT "Raum_pkey" PRIMARY KEY ("RaumID")
> )
> WITH (
> OIDS=FALSE
> );
> ALTER TABLE "Raum"
> OWNER TO egon;
> COMMENT ON COLUMN "Raum"."RaumID" IS 'Automatisch vergebenes
Identifizierungsmerkmal für den Raum';
> COMMENT ON COLUMN "Raum"."Raum" IS 'Bezeichnung des Raums';
>
>
> -- Index: "Raum_RaumID_idx"
>
> -- DROP INDEX "Raum_RaumID_idx";
>
> CREATE INDEX "Raum_RaumID_idx"
> ON "Raum"
> USING btree
> ("RaumID");
>
But psql tells me "Raum" is not existent:

> egon@xfEinzel ~ $ psql Hausrat
> psql (9.3.15)
> Type "help" for help.
>
> Hausrat=# SELECT * FROM Raum;
> ERROR: relation "raum" does not exist
> LINE 1: SELECT * FROM Raum;
> ^
> Hausrat=#

Why?

Because, "Raum" is not equal to Raum. This is because, when a name is not enclosed in " marks, PostgreSQL will force it to be lower case. So "Raum" is mixed cased, as you would expect. But Raum is basically converted to "raum".

ref: https://www.postgresql.org/docs/9.5/static/sql-syntax-lexical.html#SQL-SYNTAX-IDENTIFIERS

Egon

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Maranatha! <><
John McKown

Re: [GENERAL] Why is table not found?

От

Alban Hertroys

Дата:

31 января 2017 г., 20:00:43

> On 31 Jan 2017, at 14:45, Egon Frerich <egon@frerich.eu> wrote:
>>
>> CREATE TABLE "Raum"
>> (
>>  "RaumID" serial NOT NULL, -- Automatisch vergebenes

> But psql tells me "Raum" is not existent:
>
>> egon@xfEinzel ~ $ psql Hausrat
>> psql (9.3.15)
>> Type "help" for help.
>>
>> Hausrat=# SELECT * FROM Raum;
>> ERROR:  relation "raum" does not exist
>> LINE 1: SELECT * FROM Raum;

Instead of adding quotes to your select statement (as others suggested), IMHO the better thing to do is to remove them
fromyour create statements. Most of the time there is no benefit creating case-sensitive identifiers in a database. 

Alban Hertroys
--
If you can't see the forest for the trees,
cut the trees and you'll find there is no forest.

Re: [GENERAL] Why is table not found?

От

Egon Frerich

Дата:

31 января 2017 г., 20:17:52

Thank you all for your answers.

You see: it is a newbie question.

Egon

Am 31.01.2017 um 14:45 schrieb Egon Frerich:
>
> I created a db 'Hausrat' with a table "Raum". If I look in pgadmin I
> find the the table. In sql field is shown:
>
> > -- Table: "Raum"
>
> > -- DROP TABLE "Raum";
>
> > CREATE TABLE "Raum"
> > (
> >   "RaumID" serial NOT NULL, -- Automatisch vergebenes
> Identifizierungsmerkmal für den Raum
> >   "Raum" character varying(15), -- Bezeichnung des Raums
> >   CONSTRAINT "Raum_pkey" PRIMARY KEY ("RaumID")
> > )
> > WITH (
> >   OIDS=FALSE
> > );
> > ALTER TABLE "Raum"
> >   OWNER TO egon;
> > COMMENT ON COLUMN "Raum"."RaumID" IS 'Automatisch vergebenes
> Identifizierungsmerkmal für den Raum';
> > COMMENT ON COLUMN "Raum"."Raum" IS 'Bezeichnung des Raums';
>
>
> > -- Index: "Raum_RaumID_idx"
>
> > -- DROP INDEX "Raum_RaumID_idx";
>
> > CREATE INDEX "Raum_RaumID_idx"
> >   ON "Raum"
> >   USING btree
> >   ("RaumID");
>
> But psql tells me "Raum" is not existent:
>
> > egon@xfEinzel ~ $ psql Hausrat
> > psql (9.3.15)
> > Type "help" for help.
>
> > Hausrat=# SELECT * FROM Raum;
> > ERROR:  relation "raum" does not exist
> > LINE 1: SELECT * FROM Raum;
> >                       ^
> > Hausrat=#
>
> Why?
>
> Egon
>
> > > >

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[GENERAL] Why is table not found?

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