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任何人都可以告訴我如何使此查詢更快?使SQL查詢更快
$session_id = '000000000015';
$start = 0;
$finish = 30;
try {
$stmt = $conn->prepare("SELECT TOPUSERS.ID, TOPUSERS.USERNAME, TOPUSERS.NAME, TOPUSERS.NAME2, TOPUSERS.PHOTO, TOPUSERS.FB_USERID, TOPUSERS.IMAGE_TYPE, TOPUSERS.TW_USERID, TOPUSERS.TW_PHOTO,
COALESCE((SELECT COUNT(USERS_BUCKETS.ID) FROM USERS_BUCKETS WHERE USERS_BUCKETS.USERID=TOPUSERS.ID),0) AS NUM_ALL,
COALESCE((SELECT SUM(CASE WHEN USERS_BUCKETS.STATUS='Completed' THEN 1 ELSE 0 END) FROM USERS_BUCKETS WHERE USERS_BUCKETS.USERID=TOPUSERS.ID),0) AS NUM_DONE,
COALESCE((SELECT COUNT(USERS_LIKES.ID) FROM USERS_LIKES WHERE USERS_LIKES.USERID=TOPUSERS.ID),0) AS NUM_LIKES,
(SELECT USERS_BUCKETS.BUCKETID FROM USERS_BUCKETS WHERE USERS_BUCKETS.USERID=TOPUSERS.ID ORDER BY USERS_BUCKETS.DATE_MODIFIED DESC LIMIT 1) AS RECENT_BUCKET,
(SELECT BUCKETS_NEW.BUCKET_NAME FROM BUCKETS_NEW WHERE BUCKETS_NEW.ID=RECENT_BUCKET) AS REC,
COALESCE((SELECT COUNT(ID) FROM FOLLOW WHERE FOLLOW.USER_ID=TOPUSERS.ID),0) AS FOLLOWING,
COALESCE((SELECT COUNT(ID) FROM FOLLOW WHERE FOLLOW.FOLLOW_ID=TOPUSERS.ID),0) AS FOLLOWERS,
(SELECT IF(TOPUSERS.NAME = '',0,1) + IF(TOPUSERS.BIO = '',0,1) + IF(TOPUSERS.LOCATION = '',0,1) + IF(TOPUSERS.BIRTHDAY = '0000-00-00',0,1) + IF(TOPUSERS.GENDER = '',0,1)) as COMPLETENESS,
CASE WHEN ? IN (SELECT USER_ID FROM FOLLOW WHERE FOLLOW_ID = TOPUSERS.ID) THEN 'Yes' ELSE 'No' END AS DO_I_FOLLOW_HIM
FROM TOPUSERS
LEFT JOIN FOLLOW ON TOPUSERS.ID = FOLLOW.FOLLOW_ID
LEFT JOIN USERS_BUCKETS ON USERS_BUCKETS.USERID=TOPUSERS.ID
LEFT JOIN BUCKETS_NEW ON BUCKETS_NEW.ID=USERS_BUCKETS.BUCKETID
WHERE NOT TOPUSERS.ID = ?
GROUP BY TOPUSERS.ID ORDER BY TOPUSERS.RANDOM, TOPUSERS.USERNAME LIMIT $start, $finish");
當我在瀏覽器中運行它需要大約7秒加載。沒有幾行(中間的COALESCE,上面的兩個SELECTS和下面的行)時間縮短到3-4秒。
查詢的結果是一個名單,個人資料圖片和一些數據的人的列表。
這將**很**取決於數據庫中的數據。 – D4V1D 2015-03-31 16:49:49
我會說它作爲一個批處理作業運行,並使其填充表...然後只需在Web應用程序中讀取該表。 – developerwjk 2015-03-31 16:50:01
這是一個VPS MYSQL 5,PHP 5.4.30 – erdomester 2015-03-31 16:52:58