Using concatenation operator

From: Chris Barnes <compuguruchrisbarnes(at)hotmail(dot)com>
To: Postgres General Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: Using concatenation operator
Date: 2010-08-17 16:28:00
Message-ID: BLU149-W33402AE5ABDC1F682D0818D49C0@phx.gbl
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I have a (stupid) question regarding using concatenation operator.

I would like to get the list of tables from the database and output the select count(*) for each of them

I don't want the schema name proceeding the select, how can I omit without receiving the error below.

psql eventdb001 -t -c "select schemaname||'select count (*) from '||schemaname||'.'||relname from pg_stat_user_tables where relname like 'table_%'"|more

schemaselect count (*) from event001.table_1
schemaselect count (*) from event001.table_2

When I omit the schemaname from in front of the concatenation operator it gives me this error.

psql database -t -c "select ||'select count (*) from '||schemaname||'.'||relname from pg_stat_user_tables where relname like 'table_%'"|more
ERROR: operator does not exist: || unknown
LINE 1: select ||'select count (*) from '||schemaname||'.'||relname ...
^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts

Chris.

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