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How to write a Join query in AWS DocumentDB


By : Siri Varma
Date : October 17 2020, 06:10 AM
it should still fix some issue Left-outer joins (or correlated subqueries) are written in MongoDB using the $lookup operator.
[Updated 10/16] Amazon DocumentDB now supports $lookup: https://aws.amazon.com/about-aws/whats-new/2019/10/amazon-documentdb-add-additional-aggregation-pipeline-capabilities/
code :


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How to perform join operation similar to SQL join in Azure DocumentDB


By : Dorkmind
Date : March 29 2020, 07:55 AM
With these it helps DocumentDB does not support inter-document JOINs... instead, the JOIN keyword is used to perform intra-document cross-products (to be used with nested arrays).
I would recommend one of the following approaches:

How to write mysql query to achieve the following type of join (Join based on value of a column )


By : Suttipong Chaunket
Date : March 29 2020, 07:55 AM
this one helps. Table users: , You may check the following query:
code :
SELECT
    users.email,
    ub1.user_id,
    ub1.buddy_id,
    ub1.`status`
FROM
    users
JOIN user_buddies ub1 ON users.id = ub1.user_id OR users.id = ub1.buddy_id
WHERE   users.id = 2;
email      user_id     buddy_id     status
p@p.com       1           2         pending (if queried on users.id = 2)
s@s.com       1           2         pending (if queried on users.id = 1)
SELECT
    (
        SELECT
            u.email
        FROM users u
        WHERE   u.id =
        IF (
            users.id = ub1.user_id,
            ub1.buddy_id,
            ub1.user_id
        )
    ) AS buddyEmail,
    ub1.user_id,
    ub1.buddy_id,
    ub1.`status`
FROM
    users
INNER JOIN user_buddies ub1 ON users.id = ub1.user_id
OR users.id = ub1.buddy_id
WHERE   users.id = 2;

Azure DocumentDB, Is it possible to JOIN a list from a certain document to the query?


By : becooo
Date : March 29 2020, 07:55 AM
With these it helps There is a limit on the number of elements you can include in an IN clause. I think it's 100 though so it might actually be enough for colors. If that's not enough, then your only option is to break it down into chunks smaller than the limit, run separate queries, and concatenate the results. You could even run them in parallel. You could do all of this in a stored procedure (sproc) but for a batch of parallel reads it's usually best to just fetch directly to the client as it allows DocumentDB to read from secondaries.

How to write query in documentdb to match exact arrays?


By : Andrej
Date : March 29 2020, 07:55 AM
Does that help I recommend that you construct (in code) a query with a bunch of ANDs like this, if you want a subset match:
code :
SELECT * FROM c WHERE <myArray[0]> IN c.types AND <myArray[1]> IN c.types...
SELECT * FROM c WHERE c.types[0] = <myArray[0]> AND c.types[1] = <myArray[1]>...
SELECT * FROM c WHERE c.types[0] IN <myArray> AND c.types[1] IN <myArray>...

Custom ways to write join, inner join mysql query in codeigniter


By : Jaime Leon Nadal
Date : March 29 2020, 07:55 AM
it helps some times I have a query to select data from multiple tables. How do I write its equivalent code in codeigniter. See the query: , You can try the following (i removed the $ sign from staff)
code :
$query = $this->db
    ->select("*")
    ->from("A")
    ->join("B", "A.ad = B.ad_no")
    ->where("B.ad_no in (select ad_no from A where staff!='00:00' and staff!='0:00')",NULL, false)
    ->order_by("B.ctype", "ASC")
    ->order_by("B.cname", "ASC")
    ->order_by("B.ad_no", "ASC")
    ->get();
echo $this->db
    ->select("*")
    ->from("A")
    ->join("B", "A.ad = B.ad_no")
    ->where("B.ad_no in (select ad_no from A where staff!='00:00' and staff!='0:00')",NULL, false)
    ->order_by("B.ctype", "ASC")
    ->order_by("B.cname", "ASC")
    ->order_by("B.ad_no", "ASC")
    ->get_compiled_select();
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