Azure Stream Analytics: Get Array Elements by name - sql

Question

I was wondering if it is possible for me to get the elements of the array by the name of property than the position. For example, this is my incoming data:
{
"salesdata": {
"productsbyzone": {
"zones": [{
"eastzone": "shirts, trousers"
},
{
"westzone": "slacks"
},
{
"northzone": "gowns"
},
{
"southzone": "maxis"
}
]
}
}
}
I intend to move this to a SQL database and I have columns within the database for each zone. The problem is that the order of different zones changes within each json. I was successfully using the following query until I realized that the position of the zones changes within each json:
WITH
salesData AS
(
SELECT
(c.salesdata.productsbyzone.zone,0) as eastzone,
(c.salesdata.productsbyzone.zone,1) as westzone,
(c.salesdata.productsbyzone.zone,2) as northzone,
(c.salesdata.productsbyzone.zone,3) as sourthzone,
FROM [sales-data] as c
)
SELECT
eastzone.eastzone as PRODUCTS_EAST,
westzone.westzone as PRODUCTS_WEST,
northzone.northzone as PRODUCTS_NORTH,
southzone.southzone as PRODUCTS_SOUTH
INTO PRODUCTSDATABASE
FROM salesData
Need a way to reference these fields by the name rather than by the position.

Answer 1

I recommend a solution: Use the JavaScript UDF in the azure stream job to complete the columns sort.
Please refer to my sample:
Input data(upset the order):
{
"salesdata": {
"productsbyzone": {
"zones": [{
"westzone": "slacks"
},
{
"eastzone": "shirts, trousers"
},
{
"northzone": "gowns"
},
{
"southzone": "maxis"
}
]
}
}
}
js udf code:
function test(arg) {
var z = arg;
var obj = {
eastzone: "",
westzone: "",
northzone: "",
southzone: ""
}
for(var i=0;i<z.length;i++){
switch(Object.keys(z[i])[0]){
case "eastzone":
obj.eastzone = z[i]["eastzone"];
continue;
case "westzone":
obj.westzone = z[i]["westzone"];
continue;
case "northzone":
obj.northzone = z[i]["northzone"];
continue;
case "southzone":
obj.southzone = z[i]["southzone"];
continue;
}
}
return obj;
}
You can define the order you want in the obj parameter
SQL:
WITH
c AS
(
SELECT
udf.test(jsoninput.salesdata.productsbyzone.zones) as result
from jsoninput
),
b AS
(
SELECT
c.result.eastzone as east,c.result.westzone as west,c.result.northzone as north,c.result.southzone as south
from c
)
SELECT
b.east,b.west,b.north,b.south
INTO
jaycosmos
FROM
b
Output:
Hope it helps you.

Answer 2

You can use GetArrayElement to return array element then access to each property. Please refer the below query
WITH
salesData AS
(
SELECT
GetArrayElement(zones,0) as z
FROM [sales-data] as s
)
SELECT
z.eastzone
z.westzone
z.northzone
z.southzone
FROM PRODUCTSDATABASE
FROM salesData