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MySQL select and match two tables and update column based on matched data


By : Ikshwak
Date : September 15 2020, 04:00 PM
like below fixes the issue It seems difficult for me to thats why I need your help. So basically, I got two tables named xp_pn_resale and xp_guru_properties. What I need to do is update or set the column postal_code from table xp_pn_resale based from the data from another table. So here are my tables , Join the two tables and update.
code :
UPDATE xp_pn_resale AS r
JOIN xp_guru_properties AS p ON concat(r.block,' ', r.street_name) = p.property_name
SET r.postal_code = JSON_UNQUOTE(JSON_EXTRACT(xp_guru_properties.json, '$.postcode') )
WHERE r.street_name like '%ANG MO KIO%'
AND p.property_type like '%HDB%' AND p.property_name like '%ang mo kio%'
AND r.postal_code IS NULL


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PHP MySQL Select * from 2 different tables and display the data mixed together ordered by datetime column in both tables


By : Lạnh Như Băng
Date : March 29 2020, 07:55 AM
like below fixes the issue I have the following code... , I managed to work this out using UNION
code :
$sql ="
    SELECT datetime as datetime2, CONCAT(CONCAT('<strong>Ticket</strong> - ', ticketnumber, '<br>'),summary) as displaydata from tickets where company = '".$_GET["seq"]."'
    UNION
    SELECT timestamp as datetime2, CONCAT('<strong>Note</strong><br>',notes) as displaydata from customer_notes where customer='".$_GET["seq"]."'
    order by datetime2 DESC ";
    $rs=mysql_query($sql,$conn) or die(mysql_error());
    echo '<table width="100%" border="0" cellspacing="5" cellpadding="5">';
    while($result=mysql_fetch_array($rs))
    {
        echo '<tr>
            <td width="150px" valign="top">'.$result["datetime2"].'</td>
            <td valign="top">'.nl2br($result["displaydata"]).'</td>
          </tr>';
}
echo '</table>';

How can I select distinct column based on max datetime (another column) also joining two tables in MySQL?


By : Skopin
Date : March 29 2020, 07:55 AM
I wish this help you I've read many somewhat similar questions here and tried everything I can think of, without success. I think I've found the question based on a single table, or without the need for getting a distinct column, but not my situation exactly. , Try
code :
SELECT q.ticker_symbol, t.ticker_name, q.ticker_quote
  FROM (SELECT ticker_symbol, MAX(created_at) created_at
          FROM ticker_quotes 
         GROUP BY ticker_symbol) m JOIN
       ticker_quotes q ON m.ticker_symbol = q.ticker_symbol 
                      AND m.created_at = q.created_at JOIN
       tickers t ON q.ticker_symbol = t.ticker_symbol

MySQL - UPDATE one column based on results of a SELECT when the SELECT returns multiple columns


By : Nikhil Medapati
Date : March 29 2020, 07:55 AM
wish helps you I've read MySQL - UPDATE query based on SELECT Query and am trying to do something similar - i.e. run an UPDATE query on a table and populate it with the results from a SELECT. , Try something like this :
code :
UPDATE substances AS s,
(
SELECT s.`id`, 
GROUP_CONCAT(c.`value` ORDER BY c.`id` SEPARATOR '<br>') cas_values,
GROUP_CONCAT(s.`name` ORDER BY s.`id`) substance_name
FROM substances s
LEFT JOIN cas_substances cs ON s.id = cs.substance_id
LEFT JOIN cas c ON cs.cas_id = c.id    
GROUP BY s.id
) AS t
SET s.cas_html=t.cas_values
WHERE s.id = t.id
... 
WHERE s.id = t.id AND s.id = 1

MySQL - UPDATE query based on SELECT from multiple tables


By : Globalwalyy
Date : March 29 2020, 07:55 AM
seems to work fine Use left join for your inner queries, so if there are no associated records found for a user a null value will be returned.
code :
UPDATE users U 
       LEFT JOIN (SELECT author_id, 
                          AVG(rating) AS avgrating_posts 
                   FROM   posts PS 
                   GROUP  BY author_id) PS 
               ON U.id = PS.author_id 
       LEFT JOIN (SELECT id_user, 
                          AVG(rating) AS avgrating 
                   FROM   photos P 
                   GROUP  BY id_user) P 
               ON U.id = P.id_user 
SET    U.rating =  COALESCE(P.avgrating,0) + COALESCE(PS.avgrating_posts,0)

mySQL update based on select from other tables


By : Robert B
Date : March 29 2020, 07:55 AM
around this issue How can I update a relation table with this structure: , You should be able to do an UPDATE like this:
code :
UPDATE table1
SET isCover = 1
WHERE (multimedia_id, especie_id) IN (SELECT id as multimedia_id, 
                                        substring_index(substring_index(pathURL, '.', -3),'.', 1) as especie_id
                                      FROM multimedias
                                      WHERE tipo_multimedia_id = 31)
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