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MySQL: Why does query give NULL as a result of SUM?


MySQL: Why does query give NULL as a result of SUM?

By : user2953452
Date : November 20 2020, 01:01 AM
may help you . I'm pretty sure you want conditional aggregation -- the case statement goes inside the sum():
code :
SELECT month(created_at),
       SUM(CASE WHEN payment_method = 'Cash' THEN order_value END) as Cash,    
       SUM(CASE WHEN payment_method = 'CreditCard' THEN order_value END) as CreditCard
FROM orders  
WHERE month(created_at) BETWEEN 5 AND 6 AND year(created_at) = 2014 
GROUP BY month(created_at) 
ORDER BY SUM(order_value);


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Compound MySQL query to return null if first part is null or result otherwise

Compound MySQL query to return null if first part is null or result otherwise


By : Shri Hari Haran
Date : March 29 2020, 07:55 AM
it should still fix some issue I want to make a compound query into MySQL. If the first part of the union is null, I want to return null; otherwise, I want to return the result of the union. Example:
code :
( SELECT * FROM t1 )
UNION 
( SELECT * FROM t2 
  WHERE EXISTS
        ( SELECT * FROM t1 )
)
mysql SUM query not give expected result

mysql SUM query not give expected result


By : A Ersh
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have two tables, payment_method and product_language . product_language table has Total_Room column which contains total number of rooms available and payment_method table has Room_Booked column which contains rooms booked .
code :
SELECT `product_language`.*, `payment_language`.* , sum(coalesce(payment_method.`room_booked`), 0) as sum, 
FROM   (`product_language` 
        LEFT JOIN payment_method 
               ON ( payment_method.`product_id` = product_language.`id` )) 
group by `product_language`.*, `payment_language`.*;
SQLite query give different result from mysql

SQLite query give different result from mysql


By : eskeli
Date : March 29 2020, 07:55 AM
wish of those help The problem solved! When we try to query some column(s) from multiple table, make sure that we get the desired result by pointing directly to the column name. Here is my correct code
code :
public Cursor SelectInvoiceInById(String id){
    String query = "SELECT product_name from table_product, table_invoice_in where table_invoice_in.id_invoice_in = '"+ id + "' and table_product.id_product = table_invoice_in.id_product";
    ReadDB();
    cursor = database.rawQuery(query, null);
    cursor.moveToFirst();
    if(cursor.getCount() > 0){
        while (!cursor.isAfterLast()){
            Log.d("RESULT", String.valueOf(cursor.getString(cursor.getColumnIndex(SQLiteHelper.PRODUCT_NAME))));
            cursor.moveToNext();
        }
    }
    CloseDB();
    return cursor;
}
How To Echo Multiple MYSQL result if One Query carry Null Result?

How To Echo Multiple MYSQL result if One Query carry Null Result?


By : Todd Luke
Date : March 29 2020, 07:55 AM
With these it helps The problem here is that you are fetching data from multiple statements intermingled. You need to ensure that you get all the data you need from one query before you start the second query.
code :
$row1 = $conn->query($sql1)->fetch_assoc();
$row2 = $conn->query($sql2)->fetch_assoc();

echo $row1 ['creation_date'];
echo '<br>';
echo $row2 ['creation_date'];
Why does Mysql query only give me the last result of a query instead of all results?

Why does Mysql query only give me the last result of a query instead of all results?


By : CharlieTuna
Date : March 29 2020, 07:55 AM
I hope this helps you . getting values , This worked for me
code :
foreach($text as $values){

$query = mysql_query("SELECT id_category FROM eiofm_category_lang WHERE link_rewrite LIKE '$values'");

while ($row = mysql_fetch_assoc($query))
{
    array_push($array, $row['id_category']);
}}
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