Menetapkan nilai default untuk kolom json

Sama seperti default lainnya, setelah Anda memperbaiki sintaks json:

CREATE TABLE mytable (
    someothercol integer,
    somecol json DEFAULT '{"name": "", "other_name": ""}'
);

Jika Anda menyetel ke DEFAULT , hanya itu:

regress=> INSERT INTO mytable(someothercol, somecol) VALUES (42, '{"nondefault": 1}');
INSERT 0 1
regress=> SELECT * FROM mytable;
 someothercol |      somecol      
--------------+-------------------
           42 | {"nondefault": 1}
(1 row)

regress=> UPDATE mytable SET somecol = DEFAULT WHERE someothercol = 42;
UPDATE 1
regress=> SELECT * FROM mytable;
 someothercol |            somecol             
--------------+--------------------------------
           42 | {"name": "", "other_name": ""}
(1 row)