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かなり複雑なDELETEクエリがあり、バッチに分割する必要がありますが、クエリを実行する前に削除される行数を決定できるまで、それを行うことはできません。これが私が頼りにしたいクエリです：

DELETE parts, binaries FROM parts LEFT JOIN binaries ON binaries.ID = parts.binaryID LEFT JOIN releasenfo rn ON rn.binaryID = binaries.ID WHERE binaries.procstat IN (4, 6) AND (rn.binaryid IS NULL OR (rn.binaryid IS NOT NULL AND rn.nfo IS NOT NULL))) OR binaries.dateadded < '2013-01-04 22:01:17' - INTERVAL 36 HOUR;

これが私がうまくいくと思ったものですが、それは有効ではありません：

Select COUNT(*) FROM (DELETE parts, binaries FROM parts LEFT JOIN binaries ON binaries.ID = parts.binaryID LEFT JOIN releasenfo rn ON rn.binaryID = binaries.ID WHERE binaries.procstat IN (4, 6) AND (rn.binaryid IS NULL OR (rn.binaryid IS NOT NULL AND rn.nfo IS NOT NULL))) OR binaries.dateadded < '2013-01-04 22:01:17' - INTERVAL 36 HOUR) AS countme;

誰かが私を正しい方向に向けてくれませんか？

これをコンテキストに入れるために、次のphp擬似コードで使用したいと思います。

$limit = 10000; // Do in batches to give user status            
$totalRows = $db->query("Count query goes here");

while($rowsLeft > 0)
{
    echo "$rowsLeft remaining to be deleted\n";
    $db->query("DELETE ...... LIMIT ".$limit);
    $rowsLeft -= $limit;
}
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1 に答える 1

2

あなたは単にこれを試すことができます：

SELECT * FROM parts p 
LEFT JOIN binaries b ON b.ID = p.binaryID AND b.procstat IN (4, 6) 
LEFT JOIN releasenfo rn ON rn.binaryID = b.ID 
WHERE rn.binaryid IS NULL OR (rn.binaryid IS NOT NULL AND rn.nfo IS NOT NULL) OR 
        b.dateadded < '2013-01-04 22:01:17' - INTERVAL 36 HOUR;

DELETE p, b FROM parts p 
LEFT JOIN binaries b ON b.ID = p.binaryID AND b.procstat IN (4, 6) 
LEFT JOIN releasenfo rn ON rn.binaryID = b.ID 
WHERE rn.binaryid IS NULL OR (rn.binaryid IS NOT NULL AND rn.nfo IS NOT NULL) OR 
        b.dateadded < '2013-01-04 22:01:17' - INTERVAL 36 HOUR;
于 2013-01-05T04:00:58.430 に答える