Insert values to mysql from select query - php

Question

I have a php results page which gets values from submited php form like
$sales = mysqli_real_escape_string($link, (int)$_POST['sales']);
I have an insert query
$sql = "INSERT INTO daily (date, sales) VALUES (CURRENT_TIMESTAMP, '$sales')";
if(mysqli_query($link, $sql)){
"Records added successfully.";
} else{
echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}
Now i want to add an extra field to db which will be based on a new select query
$query = "SELECT SUM(sales) FROM daily WHERE date BETWEEN '2017-01-01' AND '2017-01-31'";
I've tried to add it to insert sql with no result
$sql = "INSERT INTO daily (date, sales, total_sales) VALUES (CURRENT_TIMESTAMP, '$sales', '$query')";
if(mysqli_query($link, $sql)){
"Records added successfully.";
} else{
echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}

Answer 1

You could use a insert/select
$sql = "INSERT INTO daily (date, sales, total_sales)
SELECT
CURRENT_TIMESTAMP,
'$sales',
SUM(sales)
FROM daily
WHERE date BETWEEN '2017-01-01' AND '2017-01-31'";
in two step you could execute your, query get the value and assign to insert ... eg:
$query = "SELECT SUM(sales) as tot FROM daily WHERE date BETWEEN '2017-01-01' AND '2017-01-31'";
mysqli_query($link, $query) ;
$row = mysql_fetch_array($result, MYSQL_NUM);
$myTotal = $row[0]
$sql = "INSERT INTO daily (date, sales, total_sales) VALUES (CURRENT_TIMESTAMP, '$sales', '$myTotal')";

Answer 2

You should run that query first, save the results in an array, cycle through the array and add the result in the correct field of your database.
what you are doing now is to add the text of your query in the total_sales column of your daily table.
You can refer to this answer to inspire yourself: Get sum of MySQL column in PHP
Also this page explains very well what you have to do, scroll down until you reach the example titled "Inserting the result of a query in another table with group by".

Answer 3

The code that worked was simple:
$result= mysqli_query($link, "SELECT SUM(sales) as valuesum FROM daily);
$row = mysqli_fetch_assoc($result);
$total_sales = $row['valuesum'];
I couldn't manage it to work because there was other errors which i found from phpfpm-error.log

Answer 4

Try this way:
$sales = mysqli_real_escape_string($link, (int)$_POST['sales']);
$query = "SELECT SUM(sales) FROM daily WHERE date BETWEEN '2017-01-01' AND '2017-01-31'"
$sql = "INSERT INTO `daily` SET `date` = CURRENT_TIMESTAMP, `sales` = ' ".$sales." ', `total_sales` = ($query)";
if(mysqli_query($link, $sql)){
"Records added successfully.";
} else{
echo "ERROR: Could not able to execute $sql. " . mysqli_error($link);
}