David G Johnston david.g.johns...@gmail.com writes:
Neil Tiffin-3 wrote
Trying to wrap my head around postgresql 9.4 jsonb and would like some
help figuring out how to do the following.
Given the following example jsonb:
‘{“name1” : value1, “name2” : value2, “name3” : [int1, int2, int3]
}’::jsonb AS table1.column1
Wanted: Return the “name3” array only, as a table with a return signature
of
TABLE( var_name varchar, var_value int, var_row_num int)
So the resulting data would look like this:
(‘name3’, int1, 1)
(‘name3’, int2, 2)
(‘name3’, int3, 3)
Assume the array could be any length except zero and ‘name3’ is guaranteed
to exist.
Also posted on stackoverflow:
http://stackoverflow.com/questions/26691725/postgresql-9-4-expand-jsonb-int-array-into-table-with-row-numbers
Not syntax checked but...
SELECT 'name3', int_text::integer AS int, int_ord
FROM ( VALUES (...) ) src (column1)
LATERAL ROWS FROM(
json_array_elements(column1-'name3')
) WITH ORDINALITY jae (int_text, int_ord)
Both WITH ORDINALITY and jsonb are introduced in 9.4; it is possible to
make this work in all supported versions of PostgreSQL through the liberal
use of CTE (WITH) as possibly the generate_series() function.
I think this can just be written as
SELECT 'name3' AS var_name,
json_array_elements(column1-'name3') AS var_value,
row_number() OVER () AS var_row_num
FROM table1
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