Re: Why is table not found?

[John McKown <john.archie.mckown@xxxxxxxxx>]

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

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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