I'm querying some data (SQL, presto), the source data has an array struct that includes a name and ID. I need to have an array of the IDs.
The data looks like:
[ { "id": 123456789,
"name": "name 1" },
{ "id": 234567891,
"name": "name 2" }
]
and I need it to look like:
[123456789, 234567891]
Do you know how I can achieve this?
It's: MAP_KEYS(MAP_FROM_ENTRIES(column))
Related
I have a table with column called tableJson which contains information of the following type:
[
{
"type": "TABLE",
"content": {
"rows":
[{"Date": "2021-09-28","Monthly return": "1.44%"},
{"Date": "2021-11-24", "Yearly return": "0.62%"},
{"Date": "2021-12-03", "Monthly return": "8.57%"},
{},
]
}
}
]
I want to change "Monthly Return" to "Weekly Return" everywhere in the table column where it exists.
Thank you in advance!
I tried different approaches to Parse, read, OPENJSON, CROSS APPLY but could not make it.
I have an entity like this:
{
"id": "xxxx",
"attributes": [{
"name": "name-01",
"value": "value-01"
}, {
"name": "name-02",
"value": "value-02"
}
]
}
Our "questions" to data usually: Give me entities with attribute or attribute with particular value;
in SQL it was written like as:
select *
from c
where
and array_contains(c.attributes, { "name": "name-01", "value": "value-01" }, true)
and array_contains(c.attributes, { "name": "name-02", "value": "value-02" }, true)
but I would like to extend a model to allow have suggestion of values in each attribute by transform an entity to:
{
"id": "xxxx",
"attributes": [{
"name": "name_01",
"value": "value-01",
"suggestions": ["a", "b", "c"]
}, {
"name": "name_02",
"value": "value-02",
"suggestions": ["a", "d", "e"]
}
]
}
With that structure I would like to ask: Give me all entities that has specified attribute and value equals to "XYZ" or suggestions array contains "XYZ";
In general scenario if always add value into array of suggestions the ask would be "Give me all entities that has specified attribute and suggestions contains XYZ"
N.B. Also I would like to make queries : Give me all entities that has more ALL specified attributes with constraints per each by suggestions?
Please suggest how to write such queries or rebuild a structure of entities in Cosmos DB;
P.S. We can technically switch from SQL to other protocol to better make such queries;
This should be doable using ARRAY_CONTAINS along with iterating the attributes array.
Give me items with value "value-01" or suggestion "f":
SELECT DISTINCT VALUE(c)
FROM c JOIN attr IN c.attributes
WHERE attr["value"] = "value-01" OR ARRAY_CONTAINS(attr.suggestions, "f")
Give me items with value "value-01" or both suggestions "a" and "f":
SELECT DISTINCT VALUE(c)
FROM c JOIN attr IN c.attributes
WHERE attr["value"] = "value-01" OR
ARRAY_CONTAINS(attr.suggestions, "a") AND ARRAY_CONTAINS(attr.suggestions, "f")
I want to get a specific string from a column. How can I get that.
Here is the json with column name json with table name my_table
I want to fetch "extensionAttribute.simSerial": "310240000029929".
{
"name": "urn:imei:930000001801583",
"type": "DEVICE",
"sourceId": "P-n1000USCqT4",
"consumers": "CDM",
"crudStatus": {
"status": "SUCCESS",
"operation": "UPDATE"
},
"targetName": "urn:imei:930000001801583",
"deviceTypeId": "dgs11b74714f7020ctoogu3zfugc6",
"createdUserId": "a8aacc5d978d494eb54ae4243e714646",
"onboardStatus": "DONE",
"consrStatus": "",
"deviceTypeName": "performance_device_type_2",
"lwm2mPskSecret": "49443",
"createdUserName": "manager",
"bootstrapRequest": true,
"lwm2mPskIdentity": "urn:imei:930000001801583",
"boostrapPskSecret": "49443",
"deviceTypeVersion": 1,
"lastUpdatedUserId": "",
"lwm2mSecurityMode": "psk",
"consumersForUpdate": "",
"bootstrapPskIdentity": "urn:imei:930000001801583",
"pureCoapSecurityMode": "NONE",
"bootstrapSecurityMode": "psk",
"extensionAttribute.imsi": "310240000029929",
"extensionAttribute.msisdn": "310240000029929",
"extensionAttribute.simSerial": "310240000029929",
"extensionAttribute.msisdnStatus": "active"
}
Solution
You can do it as follows:
select column_name->>'extensionAttribute.simSerial' as simSerial from my_table;
where column_name is your column name in a table.
If you will have JSON with higher depth you can do something like:
column_name->'key_in_json'->'another_key_in_json'->>'last_key_in_json'
Manual
JSON Functions and Operators
PostgreSQL JSON Tutorial
I am trying to build a query which combines rows of one table into a JSON array, I then want that array to be part of the return.
I know how to do a simple query like
SELECT *
FROM public.template
WHERE id=1
And I have worked out how to produce the JSON array that I want
SELECT array_to_json(array_agg(to_json(fields)))
FROM (
SELECT id, name, format, data
FROM public.field
WHERE template_id = 1
) fields
However, I cannot work out how to combine the two, so that the result is a number of fields from public.template with the output of the second query being one of the returned fields.
I am using PostGreSQL 9.6.6
Edit, as requested more information, a definition of field and template tables and a sample of each queries output.
Currently, I have a JSONB row on the template table which I am using to store an array of fields, but I want to move fields to their own table so that I can more easily enforce a schema on them.
Template table contains:
id
name
data
organisation_id
But I would like to remove data and replace it with the field table which contains:
id
name
format
data
template_id
At the moment the output of the first query is:
{
"id": 1,
"name": "Test Template",
"data": [
{
"id": "1",
"data": null,
"name": "Assigned User",
"format": "String"
},
{
"id": "2",
"data": null,
"name": "Office",
"format": "String"
},
{
"id": "3",
"data": null,
"name": "Department",
"format": "String"
}
],
"id_organisation": 1
}
This output is what I would like to recreate using one query and both tables. The second query outputs this, but I do not know how to merge it into a single query:
[{
"id": 1,
"name": "Assigned User",
"format": "String",
"data": null
},{
"id": 2,
"name": "Office",
"format": "String",
"data": null
},{
"id": 3,
"name": "Department",
"format": "String",
"data": null
}]
The feature you're looking for is json concatenation. You can do that by using the operator ||. It's available since PostgreSQL 9.5
SELECT to_jsonb(template.*) || jsonb_build_object('data', (SELECT to_jsonb(field) WHERE template_id = templates.id)) FROM template
Sorry for poorly phrasing what I was trying to achieve, after hours of Googling I have worked it out and it was a lot more simple than I thought in my ignorance.
SELECT id, name, data
FROM public.template, (
SELECT array_to_json(array_agg(to_json(fields)))
FROM (
SELECT id, name, format, data
FROM public.field
WHERE template_id = 1
) fields
) as data
WHERE id = 1
I wanted the result of the subquery to be a column in the ouput rather than compiling the entire output table as a JSON.
Let's say we have this json in our database table. I want to select value from tags. I already know how to get an array from this data but I don't know how to access array members. The question would be how do I get the first value from the array? Is there a function for this task?
{
"info": {
"type": 1,
"address": {
"town": "Bristol",
"county": "Avon",
"country": "England"
},
"tags": ["Sport", "Water polo"]
},
"type": "Basic"
}
Query I already have:
SELECT JSON_QUERY(MyTable.Data, '$.info.tags')
FROM MyTable
This returns me:
["Sport", "Water polo"]
How do I get
Sport
JSON_QUERY returns an object or array. You need JSON_VALUE to return a scalar value, eg :
SELECT JSON_VALUE(Data, '$.info.tags[0]')
from MyTable
Check the section Compare JSON_VALUE and JSON_QUERY in the docs for more examples