AW: How to surround a selected value with double quotes?

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From: Subramanian,Ramachandran <[email protected]>
To: Laurenz Albe <[email protected]>
To: [email protected] <[email protected]>
Subject: AW: How to surround a selected value with double quotes?
Date: Mon, 22 Jun 2026 08:55:48 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

Thank you so much!!!  Yes I ment bash script. 

QUOTE_IDENT()  worked like black magic!! 

Postgres puts quotes for the names that need them and no quotes for those that do not need them 😊 😊 

LG

Ram 

 11657 | data    |     5432 | "7464128"."rel_7464128_m2m_story_relatedProjects_project"                                                                                               |       8192
 11655 | data    |     5432 | "7464128"."rel_7464128_m2m_story_requiredStories_story"                                                                                                 |          0
 11527 | data    |     5432 | catemplate_backup_version_250605_1756913256437."rel_1_m2m_companies_commercialContactPersons_persons"     |          0
 11527 | data    |     5432 | catemplate_backup_version_250908_1760965502453."rel_1_m2m_companies_commercialContactPersons_persons"     |          0

Freundliche Grüße

i. A. Ramachandran Subramanian
Zentralbereich Informationstechnologie

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-----Ursprüngliche Nachricht-----
Von: Laurenz Albe <[email protected]> 
Gesendet: Montag, 22. Juni 2026 10:26
An: Subramanian,Ramachandran IT-md-db <[email protected]>; [email protected]
Betreff: Re: How to surround a selected value with double quotes?

On Mon, 2026-06-22 at 07:46 +0000, Subramanian,Ramachandran wrote:
> I wrote a script to analyze and run vacuum on tables that need it.

I assume you are talking about a bash script.

> Sadly at the time I wrote the script, I never expected a schema name 
> to be pure numbers.
>  
> So my Script does not work now.
>  
> I want to add double quote marks to each schema name and table name select.
> I tried using the CONCAT function, but it does not work as I expected it to.
>  
> I would be grateful if someone can help me understand the mistake I am making with the CONCAT.

You are a victim of (self-inflicted) SQL injection.

Just surrounding the schema name with double quotes is not enough.
What if the schema name itself contains a double quote?

You should use PostgreSQL's functions to properly quote an identifier.
With a shell script, I think your only choice is to use SQL:

#!/bin/bash

schema='12345  43'
table='tab"567'

quoted_schema=$(psql -Atq -v var="$schema" <<EOF SELECT quote_ident(:'var'); EOF
)

quoted_table=$(psql -Atq -v var="$table" <<EOF SELECT quote_ident(:'var'); EOF
)

sql="SELECT col FROM $quoted_schema.$quoted_table"

Yours,
Laurenz Albe

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