Running query dynamically inside snowflake sql stored procedure - snowflake-cloud-data-platform

Question

I need to run the query which is saved in a field in one table and insert the value of query output into another table.
To simplify the ask I have created dummy tables and try to test the logic.
Table 1
create table tsql(id string, q string);
insert into tsql values (1,'Select current_date');
Table tsql has select query in field name q.
Table 2
create table tinput(d date);
Table 2 will get updated from the value in table 1.
Below are the stored procedure I am trying to write. I know this can be done in javascript stored proc but I need to write this in sql as we are following SQL for all other.
Procedure so far.
create or replace procedure sqlreadwrite(id string)
returns string
language sql
as
$$
Declare
select_statement String;
begin
create or replace temp table tk
as select q from tsql where id = :id;
--select_statement := 'insert into tinp values (execute immediate 'Select Q from tk')';
execute immediate 'insert into tinp values (execute immediate 'Select Q from tk')';
return 'Success';
end;
$$;
Till now it is failing.

Answer 1

you don't need to call execute immediate twice, you should call it only once. One thing i wee is you have not specified the list of columns in you INSERT statement , it is always better to specify the list of column.
-- untested
execute immediate 'insert into tinp values (Select Q from tk)';

Answer 2

I figured out a way, however I am open to suggestion and better approach.
Below is the query.
create or replace procedure sqlread(id string)
returns string
language sql
as
$$
Declare
select_statement String;
res resultset;
value string;
res1 resultset;
v string;
begin
create or replace temp table tk as select q from tsql where id = :id;
select_statement := 'Select Q from tk';
res := (execute immediate :select_statement);
let c1 cursor for res;
for row_variable in c1 do
value := row_variable.Q;
res1 := (execute immediate :value);
let c1 cursor for res1;
for row_variable1 in c1 do
v := row_variable1.current_date::date;
insert into tinp values (:v);
end for;
End For;
return v;
end;
$$;

Answer 3

If the target table (tinput) will only accept dates, I wonder what kind of queries are stored in the source table (tsql)? Anyway, I assume there is a business requirement behind this, so your approach should be OK.
Some improvements:
You may remove the TEMP table as it doesn't provide any benefits.
If your procedure will only run 1 query from tinput (if IDs are unique), then you don't need a loop.
Here is the sample code:
create or replace procedure sqlread(p_id string)
returns string
language sql
as
$$
Declare
select_statement String;
res resultset;
value string;
res1 resultset;
v string;
begin
select_statement := 'select q from tsql where id = ?';
res := (execute immediate :select_statement using (P_ID));
let c1 cursor for res;
open c1;
fetch c1 into value;
res1 := (execute immediate :value);
let c2 cursor for res1;
open c2;
fetch c2 into value;
insert into tinput values (:value);
return :value;
exception
when other then
return 'error';
end;
$$;