Snowflake group by errors out on query with information schema - sql

Question

I am using information schema to get count of distinct on all columns from schema and table.
I don't have access to create procedures/views/temp_tables. this option is ruled out. All I have access is select
What I wanted to do:
To query information schema for a table get all columns and run count(distinct of each column)
What is my input information schema
What should be my output
table_name column_name no_of_unique elements
Approach tried below is the query
select 'xyz' as table_name,'{1}',
count(0) from
(select {0}
from {1}
group by {0}
having count(0) > 1
from (
select ARRAY_TO_STRING(array_agg(column_name),',')
from first_db.information_schema.columns
where table_schema='abc'
and TABLE_NAME='xyz'));
Below is the error I get
SQL compilation error: syntax error line 1 at position 8 unexpected '0'. syntax error line 1 at position 17 unexpected '1'. syntax error line 1 at position 30 unexpected '0'. syntax error line 1 at position 53 unexpected 'from'.

Answer 1

I have achieved in two step process
Step 1: From information schema I have constructed the process in the format I need
Below is the code
select $4 dyn_col,$5 static_col from (
select 'SRC' as db, 'ab_x' as schema_nm,'a' as tbl_nm,ARRAY_TO_STRING(array_agg(concat('count(distinct ',column_name,') ',column_name)),','),ARRAY_TO_STRING(array_agg(column_name),',')
from edw_src.information_schema.columns where table_schema='ab_x' and
TABLE_NAME='a' AND COLUMN_NAME not in ('VALUE'));
Above query returns two columns as output . First column will have dynamically constructed columns as count(distinct col1),count(distinct col2) and second column will have plain "column names separated with commas"
Step 2:
Now I put above output results in below query
select 'a' as table_name,column_name,column_value no_of_unique_elements from (
select "From above query your count(distinct colums>" from SRC.ab_x.a)
unpivot(column_value for column_name in ("column names separated with commas"))
;
Now I get my intended output as expected
table_name column_name no_of_unique_elements