[英]count rows from another join table
我創建了兩個表。 一個episode
表和一個season
表,我想知道我如何 select 並顯示每個季節的劇集計數或將它們保存在season.episodes_count
什么是正確的方法或查詢這樣做?
try {
$stmt = $db->prepare("SELECT * FROM `season` WHERE season.show_id = '" . $show_id . "' ORDER BY season_number DESC");
// how to select episodes_count?
$stmt->execute();
$seasons = $stmt->fetchAll(PDO::FETCH_ASSOC);
} catch (PDOException $e) {
echo $e;
}
嗨,沒有要測試的數據庫,這沒有經過測試,但是像這樣:
$stmt = $db->prepare("
SELECT se.id,
se.season_number,
COUNT(es.id) AS episodes_count
FROM season AS se
LEFT JOIN espisode AS es ON (se.id = es.season_id)
WHERE se.show_id = $show_id
ORDER BY se.season_number DESC
");
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