Re: Jsonb column
От | MICHAEL LAZLO |
---|---|
Тема | Re: Jsonb column |
Дата | |
Msg-id | 1169265872.231129.1552408217005@connect.xfinity.com обсуждение исходный текст |
Ответ на | Re: Jsonb column (Alexandru Lazarev <alexandru.lazarev@gmail.com>) |
Список | pgsql-sql |
Ah,
Now I see what is going on. SETOF is like a NESTED TABLE in Oracle in the sense that each function is returning a table structure (SETOF). Because I used
FETCH FIRST 1 ROWS ONLY
the query is technically only returning 1 row from the output AFTER the rest of the query runs. It is generating output, then the limiting takes place, so the first row returned from json_object_keys & jsonb_each return only 1 row each also.
So if I change my query to, because the first row returned has 20 keys:
SELECT message_time
,airport
,jsonb_pretty(properties) as properties
,jsonb_object_keys(properties) as keys
,jsonb_each(properties) as json
FROM JMS_MESSAGE
FETCH FIRST 20 ROWS ONLY;
it will return all the SETOF rows back with repeating values from the JMS_MESSAGE table itself.
Since I am just trying to get an idea of what key are stored in this table column, AND this table has over 288 million rows, I limited it to show just the first row. This is what caused my the confusion.
So
Thanks for the help.
On March 12, 2019 at 10:27 AM Alexandru Lazarev <alexandru.lazarev@gmail.com> wrote:Because you obtain Cartesian JOIN between following data-sources:- jsonb_pretty(properties) as properties,- jsonb_object_keys(properties) as keys, which is SETOF all keys- jsonb_each(properties) as json, which is SETOF jey-values from your columnproperties::jsonb ? 'sendTo' as second, which is single TRUE/FALSEThen you do"FETCH FIRST 1 ROWS ONLY;"which will return only 1st row of all rows from above combinationsMaybe You need something like?SELECT jsonb_pretty( j.properties) as properties,jsonb_object_keys( j.properties) as keys,jsonb_each( j.properties) as json, j.properties::jsonb ? 'sendTo' as second FROM(select * from JMS_MESSAGE FETCH FIRST 1 ROWS ONLY) j;But for each key (from "jsonb_object_keys") and key-values row (from "jsonb_each") you'll have fetched each time full jsonb column pretty-printed and TRUE/FALSE from "?"-operatorRegards,AlexLOn Tue, Mar 12, 2019 at 3:33 PM MICHAEL LAZLO < giantmetfan@comcast.net> wrote:I have a table that has a column, properties, of type jsonb.
Based on documentation:
https://www.postgresql.org/docs/10/functions-json.html
To see all key / value pairs laid out as a table structure of columns, I can use function:
jsonb_each(jsonb) which returns:
"setof key text, value jsonb"
Also if I want to see just the keys, I can use function:
jsonb_object_keys(jsonb) which returns:
"Returns set of keys in the outermost JSON object."
, as per documentation.
So why does my output look like this:
SELECT jsonb_pretty(properties) as properties,jsonb_object_keys(properties) as keys,jsonb_each(properties) as json, properties::jsonb ? 'sendTo' as second FROM JMS_MESSAGE
FETCH FIRST 1 ROWS ONLY;
properties | keys | json | second
-------------------------------------------------------------------------------+------+---------------+--------
{ +| uri | (uri,"""/""") | t
"uri": "/", +| | |
"sendTo": "all", +| | |
"tracon": "A80", +| | |
"airport": "KATL", +| | |
"msgType": "ML", +| | |
"version": "4.0", +| | |
"__HQ_CID": "5499f946-2ec6-11e9-916d-d566236f637b", +| | |
"globalID": "41965859", +| | |
"msgSeqID": "2530832", +| | |
"timeline": "1550015275141 1550015275141 1550015275216", +| | |
"timestamp": "2019-02-12T23:47:55.141Z", +| | |
"req_method": "POST", +| | |
"JMS_Solace_isXML": "true", +| | |
"JMSXDeliveryCount": "1", +| | |
"HQ_BRIDGE_MSG_ID_LIST": "ID:10.182.186.1188f32163b022a1ad0:16940996805",+| | |
"JMS_Solace_DeliverToOne": "false", +| | |
"solace_routing_dest_name": "SMES/all/ML/KATL/A80", +| | |
"JMS_Solace_ElidingEligible": "false", +| | |
"JMS_Solace_DeadMsgQueueEligible": "false", +| | |
"Solace_JMS_Prop_IS_Reply_Message": "false" +| | |
} | | |
(1 row)
The above jsonb_each and jsonb_object_keys both return only the first key. The boolean check if some key is in the jsonb column, (properties::jsonb ? 'sendTo'), returns true so I should see it in the returns for jsonb_each and json_object_keys.
Anyone know why I am not seeing all the keys in this row column?
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