我有3个包含以下架构的表。
a.c1 int (pk),
a.c2 varchar(50),
a.c3 varchar(50),
b.c1 int(pk),
b.c2 int(fk) -> a.c1,
b.c3 varchar(50),
b.c4 varchar(50),
c.c1 int(pk),
c.c2 int(fk) -> b.c1,
c.c3 int(fk) -> a.c1,
c.c4 varchar(50),
c.c5 varchar(50)
我希望结果是
{
"json_doc": {
"a.c1": "val",
"a.c2": "val",
"a.c3": "val",
"b": [{
"b_c1_value": {
"b.c1": "val",
"b.c2": "val",
"b.c3": "val",
"b.c4": "val",
"c": [{
"c_c1_value": {
"c.c1": "val",
"c.c2": "val",
"c.c3": "val",
"c.c4": "val",
"c.c5": "val"
}
}]
}
}]
}
}
有人可以帮助我使用正确的sql。我对Postgres非常陌生。
我已经走到了这一步:
select row_to_json(t)
from (
select
*,
(
select array_to_json(array_agg(row_to_json(d)))
from (
select
*,
(
select array_to_json(array_agg(row_to_json(dc)))
from (
select *
from c
where c.c2 = b.c1
) dc
) as c
from b
where c2 = a.c1
) d
) as b
from a
WHERE a.deployid = 19
) t;
我需要填充数组的密钥名称。我坚持这个。非常感谢任何帮助!