I have made a query on a data and it returns a result:
[ RowDataPacket { 'COUNT(t.id)': 2 } ]
How can I access it like the count number?
I have tried result.COUNT(t.id) but it isn't worked.
The way the object is named, you need to access it like so:
result[0]["COUNT(t.id)"]
I would rather name the columns explicitly by using aliases in the query:
select count(t.id) as count_of_id
from ...
Related
I have a query like this...
SELECT *
FROM `000027`,`000028`
WHERE `000027`.id=(SELECT max(`000027`.id) FROM `000027`)
AND `000028`.id=(SELECT max(`000028`.id) FROM `000028`)
which returns something like this in phpmyadmin...
id time value id time value
However, in react.js it is only returning one of these like this...
id time value
2 questions, Why is it doing this? and, how can I get it to return both instead of one?
my node.js code...
const sqlSelect = "SELECT * FROM `000027`,`000028` WHERE `000027`.id=(SELECT max(`000027`.id) FROM `000027`) AND `000028`.id=(SELECT max(`000028`.id) FROM `000028`)"
dbPlant.query(sqlSelect, (err, result) => {
console.log(result)
res.send(result)
res.end()
})
and it sends this back with only one rowdatapacket when it should be two, or two of each of those values...
[
RowDataPacket {
id: 652,
time: 2021-01-24T17:28:01.000Z,
value: '262'
}
]
Your two tables have some column names in common. This is okay to have repeated column names in a result set in the mysql client, but some programming interfaces map a rows of a result set into a hash array, where the column names are the keys. So if you have duplicate column names, one naturally overwrites the other.
The remedy is to define column aliases for one or the other of each duplicate, so they are mapped into distinct keys in the result set.
You must do this one column at a time. Sorry, you can't use SELECT * anymore (you shouldn't use SELECT * anyway). There is no "automatic alias all columns" option.
SELECT
`000027`.id AS id27,
`000027`.time AS time27,
`000027`.value AS value27,
`000028`.id AS id28,
`000028`.time AS time28,
`000028`.value AS value28
FROM `000027`,`000028`
WHERE `000027`.id=(SELECT max(`000027`.id) FROM `000027`)
AND `000028`.id=(SELECT max(`000028`.id) FROM `000028`)
I am trying to delete objects from my JSON array in MySQL.
I have a table called cart with two fields quote_id type int and items type json with the following row stored inside MySQL
quote_id: 0
items:
[
{
"a":42,
"b":"test4"
},
{
"a":32,
"b":"test3"
}
]
I am trying to create a query which would delete json objects from the json array. For example every
{
"a":32,
"b":"test3"
}
I have tried many queries. First I ended up with this:
UPDATE cart
SET items = IFNULL(JSON_REMOVE(items, JSON_UNQUOTE(JSON_SEARCH(items, 'one', 'test3'))), items)
WHERE quote_id = 13392;
However it just deletes "b":"test3" from the second object and left the "a":32 in it and I need a query that would find the whole object and would delete it.
This is my second query:
UPDATE cart
SET items = IFNULL(JSON_REMOVE(items, JSON_SEARCH(items, 'one', CAST('{"a": 32, "b": "test3"}' AS JSON))), items)
WHERE quote_id = 13392;
However I don't think the search on it works. I tried it without using the CAST()AS JSON, however it still did not work.
As I said I am pretty sure the problem is with the JSON_SEARCH, but maybe someone has the solution?
Thank you!
The JSON_SEARCH returns the path of the property, not the path to the object itself.
So you can use the following solution to get the object path with SUBSTR:
SELECT JSON_REMOVE(items,
SUBSTR(JSON_UNQUOTE(JSON_SEARCH(items, 'one', 'test3')), 1, LOCATE('.', JSON_UNQUOTE(JSON_SEARCH(items, 'one', 'test3')))-1)
) FROM cart
You can also use REGEXP_SUBSTR to get the object path:
SELECT JSON_REMOVE(items, REGEXP_SUBSTR(JSON_UNQUOTE(JSON_SEARCH(items, 'one', 'test3')), '^\\$\\[[0-9]+\\]'))
FROM cart
demo on dbfiddle.uk
Is there a way to get the output of a MySQL query to list rows in the following structure
{
1:{voo:bar,doo:dar},
2:{voo:mar,doo:har}
}
as opposed to
[
{id:1,voo:bar,doo:dar},
{id:2,voo:mar,doo:har}
]
which I then have to loop through to create the desired object?
I should add that within each row I am also concatenating results to form an object, and from what I've experimented with you can't group_concatenate inside a group_concatenation. As follows:
knex('table').select(
'table.id',
'table.name',
knex.raw(
`CONCAT("{", GROUP_CONCAT(DISTINCT
'"',table.voo,'"',':','"',table.doo,'"'),
"}") AS object`
)
.groupBy('table.id')
Could GROUP BY be leveraged in any way to achieve this? Generally I'm inexperienced at SQL and don't know what's possible and what's not.
I have this queries:
select otherDocKey from bucket use keys '1234'
update bucket use keys 'hear I need the result of the first query' set ...
I want to do something like that:
update bucket use keys (select otherDocKey from bucket use keys '1234') set kuku = 3
but the response I get is:
[
{
"code": 5030,
"msg": "Missing or invalid primary key map[otherDocKey:\"56443\"] of type map[string]interface {}."
}
]
is there a way to do that in one query?
I am using couchbase version 4.5
The problem with your query is that the nested subquery returns a json result. I.e., the query:
select otherDocKey from bucket use keys '1234'
will return a result that looks like:
{"otherDocKey":"This_is_the_key_for_the_other_doc"}
But you don't want json, you just want the value from the json. For that you need to use 'select raw'. E.g.,
select raw otherDocKey from bucket use keys '1234'
That should give you a result that looks like:
["This_is_the_key_for_the_other_doc"]
When the subquery returns that kind of result, the "use keys" should work properly.
I am able to do a group by query like this
https://data.sfgov.org/resource/wwmu-gmzc.json?$query=select%20title,%20release_year,%20locations,%20COUNT(title)%20group%20by%20release_year,%20title,%20locations%20order%20by%20title%20desc
But unable to return a list of values for a single group by. say group by release_year or title or locations.
For example, when I use group by release_year, I'd like to return the following
{
"release_year": "1949",
"entires": [
{
"title": "blh blh"
"locations": "soma"
}
]
}
Do you know how i can do this?
The $group parameter is used for aggregation, not for nesting like you're trying to do. There isn't a SoQL parameter or function that will change the structure of the JSON response like you're looking for.
If I were you, I'd look at $order-ing by release_year and then construct the nesting you're looking for in code.