php – 将LIMIT 1添加到COUNT个查询
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这是我用来显示页面的COUNT查询:
$sql = "
SELECT SUM(num) as num FROM (
SELECT
COUNT(URL) AS num
, 'World' AS GoSection
, 'GW' AS MySite
FROM gw_geog
WHERE URL = :MyURL AND G1 = 1
UNION ALL
SELECT
COUNT(URL) AS num
, 'World' AS GoSection
, 'GW' AS MySite
FROM gw_geog_political
WHERE URL = :MyURL
) AS X";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':MyURL',$MyURL,PDO::PARAM_STR);
$stmt->execute();
$Total = $stmt->fetch();
我想做两个改变:
1)从每行删除WHERE URL =:MyURL,并将其合并到查询末尾的单行中
2)通过添加LIMIT 1来重复Zap
这就是我现在正在使用的.
$sql = "SELECT SUM(num) as num FROM (
SELECT COUNT(URL) AS num, 'World' AS GoSection, 'GW' AS MySite FROM gw_geog WHERE URL = :MyURL AND G1 = 1
UNION ALL
SELECT COUNT(URL) AS num, 'World' AS GoSection, 'GW' AS MySite FROM gw_geog_political WHERE URL = :MyURL
) AS X
WHERE X.URL LIKE :MyURL LIMIT 1";
$stmt = $pdo->prepare($sql);
$stmt->bindParam(':MyURL',$MyURL,PDO::PARAM_STR);
$stmt->execute();
$Total = $stmt->fetch();
但是,我收到错误消息Unknown column X.SUM(或X.URL等).
有人能告诉我这样做的正确方法吗?
解决方法:
使用Query As Follows,您将获得所需的输出:
SELECT
SUM(num) AS num
FROM
(
SELECT
COUNT(URL) AS num,
'World' AS GoSection,
'GW' AS MySite,
gw_geog.`URL` as URL
FROM
gw_geog
WHERE
URL = :MyURL
AND G1 = 1
UNION ALL
SELECT
COUNT(URL) AS num,
'World' AS GoSection,
'GW' AS MySite,
gw_geog_political.`URL` as URL
FROM
gw_geog_political
WHERE
URL = :MyURL
) AS X
WHERE
X.URL like :MyURL
LIMIT 1
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