Getting Numeric value not recognized - snowflake-cloud-data-platform

Question

SELECT ID,INDEX,purchase_list,
NVL(CASE WHEN INDEX = 2 THEN purchase_list END,0)
AS qty,
sum(NVL(CASE WHEN INDEX = 2 THEN purchase_list END,0))over(partition by ID) as order_qty
FROM (
SELECT ID,index,d.value::string AS purchase_list FROM (
SELECT ID,c.value::string AS purchase_list
FROM table_1,LATERAL flatten(INPUT=>split(post_purchase_list, '|')) c
), LATERAL flatten(INPUT=>split(purchase_list, ';')) d
)WHERE ID=1250707
When I run the above query, I'm getting
Numeric value is not recognized.
The column - post_purchase_list is a VARCHAR column.

Answer 1

SELECT 'this is a string' as this_is_a_str,
NVL(this_is_a_str, 0) as one_of_these_is_str_and_the_other_is_a_number;
also gives:
Numeric value 'this is a string' is not recognized
Which to say, your types are different, ether cast your "string to a number if it is one" or cast your zero to a string '0'
SELECT '1234' as this_is_a_str,
0 as this_is_a_number,
NVL(this_is_a_str, this_is_a_number::string),
NVL(this_is_a_str::int, this_is_a_number);
this works just fine. Now for you code you are doing this twice.
SELECT
ID,
INDEX,
purchase_list,
NVL(CASE WHEN INDEX = 2 THEN purchase_list END, '0') AS qty,
sum(NVL(CASE WHEN INDEX = 2 THEN purchase_list END, '0')) over (partition by ID) as order_qty
FROM (
SELECT
ID,
index,
d.value::string AS purchase_list
FROM (
SELECT
ID,
c.value::string AS purchase_list
FROM table_1,
LATERAL flatten(INPUT=>split(post_purchase_list, '|')) c
), LATERAL flatten(INPUT=>split(purchase_list, ';')) d
)
WHERE ID = 1250707
but as mentioned before those flattens could be written
SELECT
ID,
INDEX,
purchase_list,
NVL(CASE WHEN INDEX = 2 THEN purchase_list END,'0') AS qty,
sum(NVL(CASE WHEN INDEX = 2 THEN purchase_list END,'0')) over (partition by ID) as order_qty
FROM (
SELECT
ID,
d.index,
d.value::string AS purchase_list
FROM table_1
,LATERAL flatten(INPUT=>split(post_purchase_list, '|')) c
,LATERAL flatten(INPUT=>split(c.value::string, ';')) d
)
WHERE ID = 1250707
and the qty can be reused:
SELECT
ID,
INDEX,
purchase_list,
NVL(CASE WHEN INDEX = 2 THEN purchase_list END,'0') AS qty,
sum(qty) over (partition by ID) as order_qty
FROM (
SELECT
ID,
d.index,
d.value::string AS purchase_list
FROM table_1
,LATERAL flatten(INPUT=>split(post_purchase_list, '|')) c
,LATERAL flatten(INPUT=>split(c.value::string, ';')) d
)
WHERE ID = 1250707
OR
SELECT
ID,
d.index,
d.value::string AS purchase_list,
NVL(CASE WHEN d.index = 2 THEN purchase_list END, '0') AS qty,
sum(qty) over (partition by ID) as order_qty
FROM table_1
,LATERAL flatten(INPUT=>split(post_purchase_list, '|')) c
,LATERAL flatten(INPUT=>split(c.value::string, ';')) d
WHERE ID = 1250707