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$query = "SELECT sum(amount) FROM data WHERE ticker = 'ETH'";
$result = $conn -> query($query);
$row = mysqli_fetch_row($result);
$total_eth = $row[0];
$query = "SELECT sum(amount) FROM data WHERE ticker = 'ETC'";
$result = $conn -> query($query);
$row = mysqli_fetch_row($result);
$total_etc = $row[0];
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$query = "SELECT sum(amount) FROM data WHERE ticker = 'ETH'";
$result = $conn -> query($query);
$row = mysqli_fetch_row($result);
$total_eth = $row[0];
$query = "SELECT sum(amount) FROM data WHERE ticker = 'ETC'";
$result = $conn -> query($query);
$row = mysqli_fetch_row($result);
$total_etc = $row[0];
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SELECT sum(amount) FROM data GROUP BY ticker = 'ETC'?
АГ
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АГ