Parse JSON into PL SQL with poor formatting - json

Question

I am trying to parse JSON with poorly formatted code into sql table, however some of the values are creating problem.
Database is oracle 19.2
The json data is :
Insert into r_data (id,data)values
(1,'{'"View":"100",
"Assignment Title":"Collect all snippets from the Library",
"Status":"In Progress",
"Active/Not Active":"Depends"}');
I want the result as:
View Assignment_Title Status Active_Not_Active
100 Collect all snippets from Library In progress Depends
When i write the query,
select * from r_data x JSON_TABLE(x.data,'$',
COLUMNS (view NUMBER(10) PATH '$.view')
--for the first column view , it throws error of invalid identifier at the word view.
It only works fine for column Status as probably its single word and because view is keyword it is throwing problem. However i cannot change these names and want column View as View, Assignment Title as Assignment Title and Active/not Active as Active_not_Active.
How can this be done?

Answer 1

The main issue is that view is a reserved keyword, and therefore it can't be used as a column name (unless in double quotes - which is best avoided). You wanted to create a column named view from the data in your JSON - that's why you got the "invalid identifier" error.
But there are numerous other errors in your code; if you even made it as far as the "invalid identifier" error, that means that the code you posted is not the code you ran.
For example, even in the insert statement, you have an extra single-quote after the opening brace. That means that the opening brace is a string (one character) and the rest is who-knows-what. I had to remove that errant single-quote to make the insert work. How were you able to use that obviously syntactically incorrect statement?
In the select statement you are missing a comma after the alias x (before the keyword JSON_TABLE). No way you would get the "invalid identifier" error with that syntax error in the code.
In the JSON_TABLE function, there should be no comma between '$' and the COLUMNS clause. With that comma there, you would get a different error, not "invalid identifier" - so I don't believe that what you posted is your real code.
Etc. If all you got was an "invalid identifier" error, just choose a different name for the column (view won't work) and see what happens. Although... there is one more mistake, and it will result in an unexpected result. JSON is case sensitive. The attribute name in the JSON is View, with a capital V. So you must reference it as $.View in JSON_TABLE; you have $.view, which doesn't correspond to any attribute in your JSON, so you will get null for that column (if you don't change it to match capitalization from the JSON).
Here is the complete example, with all the errors corrected.
First, create the table. I do it all in one step:
create table r_data (id,data) as select 1,'{"View":"100",
"Assignment Title":"Collect all snippets from the Library",
"Status":"In Progress",
"Active/Not Active":"Depends"}' from dual;
Then, here is the query and its output. Notice the double-quotes around property names with embedded spaces (and forward slash, etc.).
select x.id,
j.view_, assignment_title, j.status, j.active_not_active
from r_data x,
json_table(x.data,'$'
columns (view_ number(10) path '$.View',
assignment_title varchar2(50) path '$."Assignment Title"',
status varchar2(20) path '$.Status',
active_not_active varchar2(20) path '$."Active/Not Active"'
)
) j
;
ID VIEW_ ASSIGNMENT_TITLE STATUS ACTIVE_NOT_ACTIVE
-- ----- ------------------------------------- ----------- ------------------
1 100 Collect all snippets from the Library In Progress Depends