SQL Selecting from Two Tables With Inner Join and Limit

SQL Selecting from two Tables with inner join and limit

You can do this:

SELECT 
  ser.id, 
  ser.name, 
  s.status, 
  s.timestamp 
FROM Service ser 
INNER JOIN status as s ON s.service_id = ser.id
INNER JOIN
(
   SELECT
     service_id, 
     MAX(timestamp) AS MaxDate
   FROM status 
   GROUP BY service_id
) AS a  ON a.service_id = s.service_id 
       AND a.MaxDate = s.timestamp;

The join with the subquery:

SELECT
  service_id, 
  MAX(timestamp) AS MaxDate
FROM status 
GROUP BY service_id

Will eliminate all the statuses except the one with the latest date.

Inner join limit the rows from second table

Select the ten transactions in a subquery:

select *
from
(
  select *
  from transactions
  order by time desc
  limit 10
) t
join queries q on q.id like concat(t.tid, '%')
order by t.time desc, t.tid, q.timestamp desc;

using a limit on one table when joining two tables in mysql

I'm assuming that the tables users and friends are joined by the columns userId and addedUserId. And I assume further that you want a list of three friends of the user with the userId = 1.

You can use a derived table by using a subselect to get the desired result:

SELECT  u.userName, u.userFriends, u.userJoined, group_concat(f.friendName) 
FROM    user u 
INNER JOIN (
    SELECT
        userId,
        friendName
    FROM
        friends
    LIMIT 3
) f
ON u.userId = f.addedUserId 
WHERE   u.userId = 1
GROUP   by u.userName

should work.

How do you SELECT multiple tables, but only LIMIT one table

I'm not sure if LIMIT can be used in a subquery in sqlite syntax, but this is the idea

SELECT *
  FROM (SELECT * 
          FROM table_parent
         WHERE table_parent.name LIKE ‘%searchtext%’
         LIMIT 100
       ) prnt
  LEFT 
  JOIN table_child 
    ON table_child.table_parent_ID = prnt.ID
 WHERE table_child.name LIKE ‘%searchtext%’

How to: SQL Query - INNER JOIN with LIMIT 1 on the secondary table?

That doesn't make sense. It's the primary key, you're joining on. You will always get just one row per casino from the users table. And there's nothing to optimize about that. If you have performance issues, consider creating an index on casinos.ownerId if you haven't done so already.

How to INNER JOIN only 1 row from second table into the first table WITHOUT using alias

You can do:

select *
from (
  select *,
    row_number() over(partition by i.vid order by i.updated) as rn
  from table_entries e
  join table_images i on i.vid = e.vid
  where e.model like '%apple%' or e.ext like '%apple'
) x
where rn = 1 -- this is the key filter
order by lastupdated desc
limit 0, 10

Please consider this query could be awfully slow due to the use of LIKE '%text%' in the search condition, specially if the table table_entries has millions of rows.

How to limit and search number of joined rows from table in multiple joins in mysql

In MySql >= 8.0 you can number the rows using some criteria (for each Form starting from one and order by u.role ASC and u.id ASC), then you can filter rows with number one:

WITH sq AS (SELECT u.id AS user_id, f.id AS form_id, u.name, f.type, uf.additional_comment,
                   ROW_NUMBER() OVER (PARTITION BY f.id ORDER BY u.role ASC, u.id ASC) AS num
       
            FROM Forms AS f
            LEFT JOIN UsersAssignToForms AS uf ON f.id = uf.form_id
            LEFT JOIN Users AS u ON u.id = uf.user_id)
            
SELECT *
FROM sq
WHERE num = 1;

Before MySql 8.0 you can try something like this (the idea is the same but with different implementation):

SELECT sq2.user_id, sq2.form_id, sq2.name, sq2.type, sq2.additional_comment
FROM (
    SELECT 
           sq1.*,
           
           @row_number:=CASE WHEN @form_id = sq1.form_id THEN @row_number + 1 ELSE 1 END AS num,
           @form_id:= sq1.form_id
        
    FROM (SELECT u.id AS user_id, f.id AS form_id, u.name, f.type, uf.additional_comment
          FROM Forms AS f
          LEFT JOIN UsersAssignToForms AS uf ON f.id = uf.form_id
          LEFT JOIN Users AS u ON u.id = uf.user_id
          ORDER BY f.id ASC, u.role ASC, u.id ASC) AS sq1
          
    ORDER BY sq1.form_id) AS sq2

WHERE sq2.num = 1;

Join two tables in different databases with setting limit MySQL

You can read about LIMIT HERE

You can also read about ORDER BY HERE

The syntax for them based on the SQL you posted would be:

SELECT a.*, b.*
FROM  tsv_test.title_ratings a
      INNER JOIN movielens.links b    
      ON a.tconst = b.imdbid
      ORDER BY a.field_name ASC
      LIMIT 10

Note that I don't know what your field names are, so I threw in a.field_name so you can see what the syntax looks like.