Обсуждение: Using concatenation operator

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.

On 17 Aug 2010, at 18:28, Chris Barnes wrote:

>  psql database -t -c "select ||'select count (*) from '||schemaname||'.'||relname from pg_stat_user_tables where
relnamelike '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

There's nothing before the first concat operator ;)

Alban Hertroys

--
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