mysql中查询出现的错误_在MySQL查询中查询语法错误
您在此專欄后缺少逗號：
`p`.`name`請考慮以下查詢：
SELECT i.itemtype AS Item
, p.name
, SUM(CASE
WHEN itemtype = 2148 THEN i.count
ELSE 0
END) AS Count
, SUM(CASE
WHEN itemtype = 2152 THEN i.count
ELSE 0
END) * 100 AS Count1
, SUM(CASE
WHEN itemtype = 2160 THEN i.count
ELSE 0
END) * 10000 AS Count2
FROM player_items AS i
LEFT JOIN players AS p ON i.player_id = p.id
WHERE i.itemtype IN (2148, 2152, 2160)
GROUP BY i.itemtype ASC
LIMIT 0, 30要將這三列合并在一起，您可以：
SELECT t.itemType AS Item, t.Count, t.Count1, t.Count2
, SUM(t.Count1, t.Count2, t.Count3) AS Total
FROM
(
SELECT i.itemtype AS Item
, p.name
, SUM(CASE
WHEN itemtype = 2148 THEN i.count
ELSE 0
END) AS Count
, SUM(CASE
WHEN itemtype = 2152 THEN i.count
ELSE 0
END) * 100 AS Count1
, SUM(CASE
WHEN itemtype = 2160 THEN i.count
ELSE 0
END) * 10000 AS Count2
FROM player_items AS i
LEFT JOIN players AS p ON i.player_id = p.id
WHERE i.itemtype IN (2148, 2152, 2160)
GROUP BY i.itemtype ASC
LIMIT 0, 30
) AS t或者您可以添加另一個CASE
SELECT i.itemtype AS Item
, p.name
, SUM(CASE
WHEN itemtype = 2148 THEN i.count
ELSE 0
END) AS Count
, SUM(CASE
WHEN itemtype = 2152 THEN i.count
ELSE 0
END) * 100 AS Count1
, SUM(CASE
WHEN itemtype = 2160 THEN i.count
ELSE 0
END) * 10000 AS Count2
, SUM(CASE
WHEN itemtype = 2148 THEN i.count
WHEN itemtype = 2152 THEN (i.count * 100)
WHEN itemtype = 2160 THEN (i.count * 10000)
ELSE 0
END) AS Total
FROM player_items AS i
LEFT JOIN players AS p ON i.player_id = p.id
WHERE i.itemtype IN (2148, 2152, 2160)
GROUP BY i.itemtype ASC
LIMIT 0, 30CASE statements使您無需運行另外三個SELECT語句來返回相同的結果。
總結
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