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MySQL: Will a column-oriented engine be available in MySQL 5.5?


MySQL: Will a column-oriented engine be available in MySQL 5.5?

By : Developer79
Date : January 10 2021, 01:57 PM
With these it helps You can't just plug a column-based engine into MySQL. The reason for this is that its optimiser only understands row-based engines which support conventional indexes.
So the column-based engines (Infobright, infinidb and Kickfire) all use their own modification to the mysql core which makes it use their optimiser instead of the standard one (in some cases for some queries only).
code :


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Sum php array (created from mysql results) depending on mysql values in another mysql column

Sum php array (created from mysql results) depending on mysql values in another mysql column


By : Mateusz Jałowiec
Date : March 29 2020, 07:55 AM
Any of those help You are going about it wrong. You can get the sum through MySql statement itself.
Use the aggrgate function sum along with group by clause.
code :
SELECT DebitAccount,sum(Account) from  2_1_journal group by DebitAccount
$query = " SELECT DebitAccount,sum(Account) as Total from  2_1_journal group by DebitAccount";
$sql = $db->prepare($query);
$sql->execute();
$data = $sql->fetchAll(PDO::FETCH_ASSOC);
foreach($data as $result){
if(strlen($result['Total']) > 0 ) {
echo "DebitAccount ". $result['DebitAccount']. "Total is: ". $result['Total']. "<br>";
print_r (array_sum($result));
}
}
Cannot access data from mysql table using object oriented style of php-mysql

Cannot access data from mysql table using object oriented style of php-mysql


By : tkvalo
Date : March 29 2020, 07:55 AM
this will help Answering my own question here.
I had commented $username and $password.
How to add auto increment column to csv Storage Engine type mysql table?

How to add auto increment column to csv Storage Engine type mysql table?


By : dash
Date : March 29 2020, 07:55 AM
it should still fix some issue The CSV storage engine also does not support indexes, so it would cause incredibly bad performance if you wanted to write a trigger to calculate the next id by SELECT MAX(id)+1... because every row insert would cause a table-scan.
If you need an auto-increment column, you must convert the table to InnoDB while adding the auto-increment column.
code :
ALTER TABLE MyTable 
  ADD COLUMN id BIGINT AUTO_INCREMENT PRIMARY KEY FIRST, 
  ENGINE=InnoDB;
Open source column-oriented storage engine for PostgreSQL?

Open source column-oriented storage engine for PostgreSQL?


By : o.O
Date : March 29 2020, 07:55 AM
around this issue Citus Data has developed an open source columnar store extension for PostgreSQL. It is available under the Apache License v2.0. It supports PostgreSQL 9.3 and higher.
First, creation the extension and a foreign server:
mysql - is there a tool that can show a live log of all the sql commands the mysql engine receives?

mysql - is there a tool that can show a live log of all the sql commands the mysql engine receives?


By : Nabhan Nazar
Date : March 29 2020, 07:55 AM
I wish this helpful for you You first need to activate the general query log. There must be some tools around to help you parse this log, my favourite being :
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