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one table or several table in mysql


one table or several table in mysql

By : Dubun
Date : November 18 2020, 03:49 PM
like below fixes the issue In a relational dbms, data table size doesn't dictate the database design, but only the relations of entities.
So even with a table of billions of records holding large multi media data, you would not make this several tables, just because the table gets so big.
code :
alter table user_movies 
add primary key (user_id, movie_id)
partition by hash(user_id) partitions 100;


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MySQL nested table selects - don't display if outer table doesn't match inner table

MySQL nested table selects - don't display if outer table doesn't match inner table


By : MrL
Date : March 29 2020, 07:55 AM
this one helps. I'm pulling a main list of directories and looping through, then nested inside the loop I'm pulling a set of notes matching each directory. , Try this:
code :
$sql_dir="SELECT l.dirid, notes FROM lit_directories l LEFT JOIN lit_notes n  ON n.dirid = l.dirid WHERE n.notes IS NOT NULL";
$result_dir=mysql_query($sql_dir);
while ($row_dir=mysql_fetch_assoc($result_dir)) {
      echo $row_notes['notes'];
}  
MySQL SELECT all from first table and join matched data from second table with specific where clause for second table fi

MySQL SELECT all from first table and join matched data from second table with specific where clause for second table fi


By : Siti Hasnah Mea Tana
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have an issue when trying to fetch out my data from my database. , Try following Query it will work for your problem:
code :
SELECT table1.user_id, table1.username, table2.key, table2.value FROM 
table1 LEFT JOIN table2 ON table1.user_id = table2.table2_userid and 
table2.key="position" group by table1.user_id
MySQL JOIN table based on MAX(date) in main table, and MAX(id) in joined table with LIMIT

MySQL JOIN table based on MAX(date) in main table, and MAX(id) in joined table with LIMIT


By : user3359515
Date : March 29 2020, 07:55 AM
Does that help I would be inclined to use a correlated subquery for the data piece -- your question only mentions one column:
code :
select u.created_date, u.ssn,
       (select d.name
        from lead_data d
        where d.ssn = u.ssn
        order by d.id desc
        limit 1
       ) as name
from lead_unique u
order by u.created_date desc
limit 2;
select u.created_date, u.ssn,
       (select d.name
        from lead_data d
        where d.ssn = u.ssn
        order by d.id desc
        limit 1
       ) as name
from (select u.*
      from lead_unique u
      order by u.created_date desc
      limit 2
     ) u;
select created_date, ssn, d.*
from (select u.created_date, u.ssn,
             (select d.id
              from lead_data d
              where d.ssn = u.ssn
              order by d.id desc
              limit 1
             ) as id
      from (select u.*
            from lead_unique u
            order by u.created_date desc
            limit 2
           ) u
     ) u join
     lead_data d
     on u.id = d.id;
Structuring a MySQL table where the PLAYLIST table refers to multiple VIDEO id integers and a USER table id

Structuring a MySQL table where the PLAYLIST table refers to multiple VIDEO id integers and a USER table id


By : kalpesh
Date : March 29 2020, 07:55 AM
Hope that helps Yes, you should create a many-to-many relationship between the video and playlist table if you want that one video could be added to multiple playlists and vice versa.
So your many-to-many relationship table could look like this where the combination of playlist_id and video_id is your primary key.
code :
playlist_has_video
------------------
playlist_id
video_id
playlist_has_video
------------------
id
playlist_id
video_id
playlist_has_video
------------------
id
playlist_id
video_id
order_id
SELECT video.* FROM playlist_has_video AS phv LEFT JOIN video ON phv.video_id = video.id WHERE phv.playlist_id = :playlist_id ORDER BY order_id ASC;
SELECT playlist.* FROM playlist_has_video AS phv LEFT JOIN playlist ON phv.playlist_id = playlist.id WHERE phv.video_id = :video_id;
video
---------
id
title
description
user_id
transcript_id
created
updated
Cannot restart the MySQL Docker container, gives errors like `Can't open the mysql.plugin table` and `Table 'mysql.user'

Cannot restart the MySQL Docker container, gives errors like `Can't open the mysql.plugin table` and `Table 'mysql.user'


By : نصر الدين
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further So docker-compose rm mysql was needed to remove the broken connection, and then launch again the container.
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