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From: hubert depesz lubaczewski <[email protected]>
To: Subramanian,Ramachandran <[email protected]>
Cc: [email protected] <[email protected]>
Subject: Re: How to surround a selected value with double quotes?
Date: Mon, 22 Jun 2026 12:09:29 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Mon, Jun 22, 2026 at 07:46:09AM +0000, Subramanian,Ramachandran wrote:
> #Build the SQL needed to get the list of tables that are approaching the SAFE_XID_GAP
> LIST_OLDEST_UNFROZEN_XID_SQL=" SELECT   \
>        cast (age(PGCL.relfrozenxid) as integer) as GAP, \
>        INTB.table_catalog as DB_NAME,   \
>        "$PORT_NO" , \
>        CONCAT('"',INTB.table_schema,'"') || '.' ||  \
>        CONCAT('"',PGCL.relname,'"') as TABLE_NAME,      \
>        pg_table_size(PGCL.oid) as TABLE_SIZE \

*NEVER* concatenate identifiers. It will lead to bugs. Instead use
format() function (I find it MUCH simpler than quote_ident):

In your case, instead of the concat calls (why concat, if you can do ||,
anyway?

select
    format('%I.%I', INTB.table_schema, PGCL.relname)
FROM
…

depesz

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