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PostgreSQL - query optimalization or multiple loops needed


PostgreSQL - query optimalization or multiple loops needed

By : user2950364
Date : November 17 2020, 11:55 AM
will help you I think what you are looking for is using GROUP BY and HAVING clauses.
code :
SELECT
    PRS_PRD_ID,
    count(PRS_PPS_ID) AS prop_count
FROM LCT_PRD_PROPERTIES
WHERE PRD_PPS_ID IN (?, ?, ...) /* <-- the properties you are searching for here */
GROUP BY PRS_PRD_ID
HAVING prop_count = ? /* value here equals number of properties being searched for */


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OpenGL ES 2.0 - performance / optimalization needed?

OpenGL ES 2.0 - performance / optimalization needed?


By : techfucorp
Date : March 29 2020, 07:55 AM
will be helpful for those in need If you're running on a newer version of the Android SDK (e.g. v16) you can use the profiler to find out where the problem areas are:
http://developer.android.com/tools/debugging/debugging-tracing.html
PostgreSQL code optimalization

PostgreSQL code optimalization


By : Sangeetha
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The subquery in the where clause is redundant. And I think you are missing a parenthesis in the where clause of the subquery in the inner join:
code :
SELECT 
    rv_storage.m_product_id AS n_product_id,
    rv_storage.value,
    rv_storage.name,
    m_warehouse.name AS warehouse_name,
    rv_storage.qtyonhand,
    rv_transaction.m_transaction_id,

    CASE WHEN rv_transaction.movementtype = 'V+' THEN movementdate
    ELSE NULL END AS last_in,

    CASE WHEN rv_transaction.movementtype = 'C-' THEN movementdate
    ELSE NULL END AS last_out,

    rv_transaction.movementagedays,

    CASE WHEN (movementagedays < -90) AND (movementagedays >= -180)  THEN qtyonhand
    ELSE NULL END AS more_than_90,

    CASE WHEN movementagedays < -180 THEN qtyonhand
    ELSE NULL END AS more_than_180
FROM
    adempiere.rv_storage
    INNER JOIN
    adempiere.rv_transaction ON
        rv_transaction.m_product_id = rv_storage.m_product_id 
        AND rv_transaction.movementagedays = (
            SELECT MAX(movementagedays) 
            FROM adempiere.rv_transaction 
            WHERE
                rv_transaction.m_product_id = rv_storage.m_product_id 
                AND (rv_transaction.movementtype = 'C-'
                    OR rv_transaction.movementtype = 'V+')
            )
    INNER JOIN
    adempiere.m_warehouse ON
        m_warehouse.m_warehouse_id = rv_storage.m_warehouse_id
WHERE movementagedays < -90
ORDER BY n_product_id;
php/mqsql multiple calls to DB and multiple loops - different logic needed

php/mqsql multiple calls to DB and multiple loops - different logic needed


By : Marine Maingot
Date : March 29 2020, 07:55 AM
this will help Well, let's start with your query. In your first query, you claim you're trying to get all of the colors for a given style. You can use the DISTINCT keyword for that
code :
SELECT DISTINCT colour_url
  FROM tbl_clothing
  WHERE style = ?
SELECT colour_url, size, carton_price
  FROM tbl_clothing
  WHERE style = ?
<?php
  $db = new PDO('connection', 'user', 'pass');
  $query = $db->prepare('SELECT colour_url, size, carton_price
                           FROM tbl_clothing
                           WHERE style = :style');
  $query->bindValue(':style', $row['style'], PDO::PARAM_STR);
  $query->execute();

  $results = $query->fetchAll(PDO::FETCH_ASSOC);

  $clothes = array();

  foreach($results as $result){
      if(!isset($clothes[$result['colour_url']]))
          $clothes[$result['colour_url']] = array();
      $clothes[$result['colour_url']][$result['size']] = $result['carton_price'];
  }
?>
<?php
  foreach($clothes as $color => $prices) {
    $sizeStr = '<td>' . implode('</td><td>', array_keys($prices)) . '</td>';
    $priceStr = '<td>' . implode('</td><td>', $prices) . '</td>';
    ?><table>
      <tr>
        <td rowspan="2">
          <img title="" alt="" src="<?=$color?>" />
        </td>
        <?= $sizeStr ?>
      </tr>
      <tr>
        <?= $priceStr ?>
      </tr>
    </table><?php
  }
?>
PostgreSQL log trigger optimalization

PostgreSQL log trigger optimalization


By : Ilya Makarov
Date : March 29 2020, 07:55 AM
Any of those help row_to_json() returns both column names and values; you may as well make use of these values, rather than extracting them later via dynamic SQL.
I haven't thoroughly tested this, let alone benchmarked it, but here's the gist of it:
code :
CREATE OR REPLACE FUNCTION table_log_trig() RETURNS trigger AS
$$
DECLARE
  OldJson JSONB = NULL;
BEGIN
  IF TG_OP <> 'INSERT' THEN
    OldJson := to_jsonb(old);
  END IF;

  INSERT INTO tab_logs (record_id, field_name, old_value, new_value, created_at, created_by, action)
  SELECT new.id, key, OldValues.value, NewValues.value, now(), 999, 'O'
  FROM jsonb_each(to_jsonb(new)) NewValues
  LEFT JOIN jsonb_each(OldJson) OldValues USING (key)
  WHERE
    (
      (TG_ARGV[0] IS NULL AND key NOT IN ('id', 'created_at', 'updated_at')) OR
      (TG_ARGV[0] IS NOT NULL AND key = ANY(string_to_array(TG_ARGV[0], ',')))
    ) AND
    OldValues.value::text IS DISTINCT FROM NewValues.value::text;

  RETURN NULL;
END
$$
LANGUAGE plpgsql VOLATILE;
Postgresql optimalization question

Postgresql optimalization question


By : user3926107
Date : March 29 2020, 07:55 AM
wish of those help I second iddqd's answer, and additionally I'd point out that there's only one way to apply LIMIT and OFFSET to a black box function; but there may be more than one way to apply them in a query -- in principle at least. LIMIT is definitely taken into account by the optimiser (it can often avoid generating more rows than will be returned). OFFSET is, I believe, not really optimised at all and even serves as a "optimisation barrier" in more complex cases; if you have a subquery with an OFFSET clause then it will be planned separately from the main query and not collapsed into it.
Ultimately, of course, you should worry about readability and usability first: is it nicer to hide the limit/offset inside the function, or outside it in every place where the function is used?
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