Using Variables in Query Criteria in a Snowflake Scripting Stored Procedure - stored-procedures

Question

In the following query I am using a stored procedure to create a table output_tbl_name from a source_tbl. The name of the output_tbl_name is timestamped with today's date.
DECLARE
creation_date STRING := to_varchar(current_date(), 'YYYYMMDD');
output_tbl_name STRING := concat('my_database.my_schema.', 'output_', :creation_date);
QUERY STRING;
BEGIN
QUERY:= REPLACE(
'create or replace table <output_tbl_name>(col1 varchar, col2 varchar) as
select * from source_tbl;'
,'<output_tbl_name>', :output_tbl_name); ;
EXECUTE IMMEDIATE :QUERY;
RETURN :QUERY;
END;
However, I would like to set a dynamic criteria for the data that is copied over. E.g., the source_tbl has a date column, and I want to only copy over records for dates > 6 months ago:
declare start_date date := add_months(current_date(), -6)
create or replace output_tbl_name as select * from source_tbl where date > <start_date>
How can I incorporate this into my above query? Placing it directly into my QUERY in my BEGIN statement isn't working. Thanks for your help!

Answer 1

create a source data table:
CREATE OR REPLACE TABLE tmp_table(col1 string);
DECLARE
creation_date STRING := to_varchar(current_date(), 'YYYYMMDD');
output_tbl_name STRING := concat('my_database.my_schema.', 'output_', :creation_date);
QUERY STRING;
source_tbl STRING := 'TMP_TABLE';
BEGIN
LET date_present := false;
SELECT true INTO :date_present FROM INFORMATION_SCHEMA.columns WHERE table_name = :source_tbl AND column_name = 'DATE';
if (date_present = true) then
QUERY := 'create or replace table <output_tbl_name>(col1 varchar, col2 varchar) as select * from source_tbl where date > <start_date>;';
ELSE
QUERY:= 'create or replace table <output_tbl_name>(col1 varchar, col2 varchar) as select * from source_tbl;';
END IF;
QUERY:= REPLACE( QUERY, '<output_tbl_name>', :output_tbl_name);
--EXECUTE IMMEDIATE :QUERY;
RETURN :QUERY;
END;
begin
let count := true;
if (count = true) then
return 'negative value';
elseif (count = 0) then
return 'zero';
else
return 'positive value';
end if;
end;
anonymous block
create or replace table my_database.my_schema.output_20220307(col1 varchar, col2 varchar) as select * from source_tbl;
put in a date column:
CREATE OR REPLACE TABLE tmp_table(col1 string, date timestamp);
anonymous block
create or replace table my_database.my_schema.output_20220307(col1 varchar, col2 varchar) as select * from source_tbl where date > <start_date>;