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Firebase query with limit / offset possible solutions


Firebase query with limit / offset possible solutions

By : sektor-13
Date : November 15 2020, 06:54 AM
hop of those help? Yup, paging through a long list of child nodes is definitely possible. The trick is to remember the key (or priority or whatever value you sort on) of the last item on the current page and then pass that into queryStartingAt... for the next page.
Kato wrote up a great example in his blog post on how to implement common SQL queries in Firebase:
code :
// fetch page 2 of widgets
new Firebase("https://examples-sql-queries.firebaseio.com/widget")
   .startAt(null, lastWidgetOnPrevPage)
   .limitToFirst(LIMIT+1) // add one to limit to account for lastWidgetOnPrevPage
   .once('value', function(snap) {
      var vals = snap.val()||{};
      delete vals[lastWidgetOnPrevPage]; // delete the extraneous record
      console.log('widgets on this page', vals);
   });


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LIMIT offset or OFFSET in an UPDATE SQL query

LIMIT offset or OFFSET in an UPDATE SQL query


By : Bharath M C
Date : March 29 2020, 07:55 AM
Any of those help Try this:
UPDATE table SET column = 'X1' WHERE id IN(SELECT id FROM (SELECT id FROM table WHERE column = 'X' LIMIT 2) as u);
Query for selecting count(*) of a query but only return a LIMIT of the query result OFFSET by something

Query for selecting count(*) of a query but only return a LIMIT of the query result OFFSET by something


By : عبدالله محي جمال بكا
Date : March 29 2020, 07:55 AM
I wish this help you I have a SQL query which runs over multiple tables to return some columns and uses LIMIT and OFFSET for pagination.
code :
SELECT a.col1, 
       b.col4, 
       c.col5,
       count(*) over () as total_count
FROM a
  JOIN b ON ..
  JOIN c ON ...
LIMIT 20 OFFSET 5
MySQL Query to Search using LIMIT and OFFSET on each Query of a UNION

MySQL Query to Search using LIMIT and OFFSET on each Query of a UNION


By : Adrián Mendoza Garcí
Date : March 29 2020, 07:55 AM
Hope this helps SQL Fiddle
MySQL 5.6 Schema Setup:
code :
CREATE TABLE Message
    (`id` int, `type_id` int, `message` varchar(10), `timestamp` int)
;

INSERT INTO Message
    (`id`, `type_id`, `message`, `timestamp`)
VALUES
    (1, 1, 'message1', 12345678),
    (2, 2, 'message2', 12345679),
    (3, 3, 'message3', 12345680)
;


CREATE TABLE Type
    (`id` int, `type` varchar(10))
;

INSERT INTO Type
    (`id`, `type`)
VALUES
    (1, 'discussion'),
    (2, 'comment'),
    (3, 'tweet')
;


CREATE TABLE DiscussionDetail
    (`id` int, `message_id` int, `from_user` varchar(10), `to_user` varchar(10))
;

INSERT INTO DiscussionDetail
    (`id`, `message_id`, `from_user`, `to_user`)
VALUES
    (1, 1, 'Peter', 'Anna')
;


CREATE TABLE CommentDetail
    (`id` int, `message_id` int, `post_id` varchar(5), `user_id` varchar(5))
;

INSERT INTO CommentDetail
    (`id`, `message_id`, `post_id`, `user_id`)
VALUES
    (1, 2, 'post4', 'user6')
;


CREATE TABLE TweetDetail
    (`id` int, `message_id` int, `twitteracct` varchar(6))
;

INSERT INTO TweetDetail
    (`id`, `message_id`, `twitteracct`)
VALUES
    (1, 3, 'myacct')
;
SELECT Message.*, type,
case when dd.id is not null then from_user 
     when cd.id is not null then post_id  
     when td.id is not null then twitteracct else '' end as detail1,
case when dd.id is not null then to_user  
     when cd.id is not null then user_id else '' end as detail2
FROM Message
INNER JOIN Type ON Type_Id = Type.id
LEFT OUTER JOIN DiscussionDetail dd ON dd.message_id = Message.id AND Type_Id = 1
LEFT OUTER JOIN CommentDetail cd ON cd.message_id = Message.id AND Type_Id = 2
LEFT OUTER JOIN TweetDetail td ON td.message_id = Message.id AND Type_Id = 3
ORDER BY timestamp LIMIT 1,1
| id | type_id |  message | timestamp |    type | detail1 | detail2 |
|----|---------|----------|-----------|---------|---------|---------|
|  2 |       2 | message2 |  12345679 | comment |   post4 |   user6 |
CREATE VIEW AllMessages AS
SELECT Message.*, type,
case when dd.id is not null then from_user 
     when cd.id is not null then post_id  
     when td.id is not null then twitteracct else '' end as detail1,
case when dd.id is not null then to_user  
     when cd.id is not null then user_id else '' end as detail2
FROM Message
INNER JOIN Type ON Type_Id = Type.id
LEFT OUTER JOIN DiscussionDetail dd ON dd.message_id = Message.id AND Type_Id = 1
LEFT OUTER JOIN CommentDetail cd ON cd.message_id = Message.id AND Type_Id = 2
LEFT OUTER JOIN TweetDetail td ON td.message_id = Message.id AND Type_Id = 3
SELECT *
FROM AllMessages
ORDER BY timestamp LIMIT 1,1
need solutions with some code of limit and order by in mysql query function

need solutions with some code of limit and order by in mysql query function


By : user3371401
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Just wrap your current query in a subquery to impose the ascending date order you want:
code :
SELECT
    post_date,
    post
FROM
(
    SELECT post_date, COUNT(*) AS post
    FROM myTable
    GROUP BY post_date
    ORDER BY post_date DESC
    LIMIT 3
) t
ORDER BY post_date;
Laravel Eloquent query limit and offset is being added automatically to count query

Laravel Eloquent query limit and offset is being added automatically to count query


By : Yonatan Yosef
Date : March 29 2020, 07:55 AM
like below fixes the issue To remove the limit and offset from the produced query, you'd need to remove these two lines from your query builder:
code :
->skip($page*$rows_per_page)
->take($rows_per_page)
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