获取多个表中的行数Redshift SQL？

Question

I have a redshift database that is being updated with new tables so I can't just manually list the tables I want. I want to get a count of the rows of all the tables from my query. So far I have:

select 'SELECT ''' || table_name || ''' as table_name, count(*) As con ' ||
       'FROM ' || table_name || 
        CASE WHEN lead(table_name) OVER (order by table_name ) IS NOT NULL 
        THEN ' UNION ALL ' END
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE '%results%'

but when I do this I get the error:

Specified types or functions (one per INFO message) not supported on Redshift tables.

I've searched a lot but I can't seem to find a solution for my problem. Any help would be greatly appreciated. Thanks!

EDIT: I've changed my approach to this and decided to use a for loop in R to get the row counts of each but I'm running into the issue that 'row_counts' is only saving one number, not the count of each row like I want. Here is the code:

schema <- "x"
table_prefix <- "results"
geos <- ad_districts %>% filter(geo != "geo")
row_count <- list()
i = 1

for (geo in geos){
  table_name <- paste0(schema, ".", table_prefix, geo)
  row_count[[i]] <- dbGetQuery(con, 
                             paste("SELECT COUNT(*) FROM", table_name))
  i = i + 1 
}

Answer 1

[EDIT] - I think this is the root cause - some sql functions are only supported on the leader node. Try connecting to that node and re-run your SQL. https://docs.aws.amazon.com/redshift/latest/dg/c_sql-functions-leader-node.html

Hope this helps.

select 'select count(*) as "' || table_schema || '.' || table_name || '" from ' || table_schema || '.' || table_name || ' ;' as sql_text
from information_schema.tables
;

[EDIT - refined this a bit to generate a series of statements that can be run at once]

select rownum, case when rownum > 1 then sql_text else replace(sql_text, 'union all', '') end as sql_text
from
(
select rank() over (order by sql_text DESC) as rownum,
        sql_text
from
(
select 'select ''' || table_schema || ' ' || table_name || ''' , count(*) as "' || table_schema || '.' || table_name || '" from ' || table_schema || '.' || table_name || ' union all ' as sql_text
from information_schema.tables
where table_schema = 'public'
order by table_schema, table_name
)X
)Y 
order by rownum desc ;

Answer 2

Your query is doing a select * for all tables, this will take a lot of time and resources. Instead use a system table to get the same info

select name, sum(rows) as rows
from stv_tbl_perm
where name like '%results%'
group by 1

Answer 3

SELECT ' Select count(*) , '''+ tablename + '''  from   '+'"' + tablename +'"' +'  Union ALL  '
FROM pg_table_def
GROUP BY tablename

Above query eliminates any table name with space. Remove UNION ALL at the end of the query and query will be ready to be executed.