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postgreSQL operator returns values out of JSON columns

Selecting 1 column:

SELECT client,
 data->'title' AS title
 FROM books;

Selecting 2 columns:

SELECT client,
 data->'title' AS title, data->'author' AS author
 FROM books;

-> vs ->>

The -> operator returns the original JSON type (which might be an object), whereas ->> returns text.

Return NESTED objects

You can use the -> to return a nested object and thus chain the operators:

SELECT client,
 data->'author'->'last_name' AS author
 FROM books;


Select rows based on a value inside your JSON:

 data->'title' AS title
 FROM books
 WHERE data->'title' = '"Dharma Bums"';

Notice WHERE uses -> so we must compare to JSON '"Dharma Bums"'

Or we could use ->> and compare to 'Dharma Bums'


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