[英]Mysql - Get data from two tables
我有兩個表webadstats和webstatsclick,我想從這兩個表中進行以下查詢。
$sql2 = "SELECT
count(*) as 'impressions',
unix_timestamp(date(from_unixtime(A.time))) as 'timestamp',
COUNT(B.click) as 'clickss'
FROM `webadstats` as A
LEFT JOIN `webstatsclick` as B
ON A.pubadhash = B.pubadhash
WHERE A.pubadhash='$pubadhash'
GROUP BY date(from_unixtime(A.time))";
$result2 = mysqli_query($conn, $sql2);
if (mysqli_num_rows($result2)>0) {
while($row = mysqli_fetch_assoc($result2)) {
$impressions[] = $row['impressions'];
$clicksall[] = $row['clickss'];
$timestamp[] = $row['timestamp'];
}
for($i=0; $i<count($clicksall); $i++){
$str .= $timestamp[$i] . '||' . $impressions[$i] . '||' . $clicksall[$i] ."\n";
}
}
echo $str;
但是問題在於,此查詢正在為印象數和點擊數這兩個變量的值正確的值生成相同的值。
1542434400||1270||1270
1542520800||1800||1800
1542607200||1745||1745
1542693600||1805||1805
1542780000||1615||1615
1542866400||1740||1740
1542952800||1740||1740
1543039200||1830||1830
1543125600||1830||1830
1543212000||1615||1615
1543298400||1880||1880
1543384800||2125||2125
1543471200||1530||1530
1543557600||1370||1370
1543644000||120||120
我的兩個數據庫結構都是webadstats db
webstatsclick數據庫
請幫助我哪里我錯了。
讓我們回到兩種查詢方法。 問題是,我們一直在嘗試在pubadhash上使用JOIN,但也嘗試在pubadhash上使用WHERE,因此值會相乘。
$sql2 = "SELECT
count(*) as 'impressions',
unix_timestamp(date(from_unixtime(time))) as 'timestamp'
FROM `webadstats`
WHERE pubadhash='$pubadhash'
GROUP BY date(from_unixtime(time))";
$sql3 = "SELECT
count(*) as 'clickss',
unix_timestamp(date(from_unixtime(time))) as 'timestamp'
FROM `webstatsclick`
WHERE pubadhash='$pubadhash'
GROUP BY date(from_unixtime(time))";
$result2 = mysqli_query($conn, $sql2);
if (mysqli_num_rows($result2)>0) {
while($row = mysqli_fetch_assoc($result2)) {
$arr[$row['timestamp']]['impressions'] = $row['impressions'];
$arr[$row['timestamp']]['timestamp'] = $row['timestamp'];
$arr[$row['timestamp']]['clickss'] = 0;
}
$result3 = mysqli_query($conn, $sql3);
if (mysqli_num_rows($result3)>0) {
while($row = mysqli_fetch_assoc($result3)) {
$arr[$row['timestamp']]['clickss'] = $row['clickss'];
}
}
foreach($arr as $clicks){
$str .= $clicks['timestamp'] . '||' . $clicks['impressions'] . '||' . $clicks['clickss'] ."\n";
}
}
echo $str;
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