Snowfalke sql update if exists else insert - sql

Question

I have looked at other question but seems that snowflake doesn't support if/else in sql, at least not the way that other sql servers support it.
some suggested to use javascript but i would like to avoid that if I can.
I am trying to Insert into a table using snowflake python library some data, if it's already there then I would like to update the data, I have looked at merge but it doesn't seem to fit me since my data isn't a table
that's what I have so far that isn't working
f"""BEGIN
IF (EXISTS (SELECT * FROM {self.okr_table} WHERE kpi=TRUE AND Month(month)=MONTH(current_date()) AND year(month)=YEAR(current_date())))
THEN
UPDATE {self.okr_table} SET [DATA] = {json.dumps(self.data)} WHERE kpi=TRUE AND Month(month)=MONTH(current_date()) AND year(month)=YEAR(current_date()))
ELSE
INSERT INTO {self.okr_table} (month, data, kpi) SELECT current_date(),parse_json('{json.dumps(self.data)}'), true;
END"""

Answer 1

To perfrom INSERT/UPDATE it is better to use single MERGE statement
I have looked at merge but it doesn't seem to fit me since my data isn't a table
It is not an issue as source could be a table or subquery:
MERGE INTO {self.okr_table}
USING (SELECT PARSE_JSON({json.dumps(self.data)} AS data
, MONTH(current_date()) AS month
, YEAR(current_date()) AS year
) s
ON {self.okr_table}.KPI
AND MONTH({self.okr_table}.month) = s.month
AND YEAR({self.okr_table}.month) = s.year
WHEN MATCHED THEN UPDATE
WHEN NOT MATCHED THEN INSER ...;
IF/ELSE branching works in Snowflake:
BEGIN
IF (EXISTS (...)) THEN
UPDATE ... ;
ELSE
INSERT ... ;
END IF;
END;
Please note ; after each statement, END IF and parenthesis around condition.