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我对这个查询有点问题。它的伟大工程,但我干的粉丝,这看起来像它可以很容易地加以改进:将查询保存在变量中,然后添加where子句?
SELECT
users.*,
(
SELECT user_information.value
FROM users
LEFT JOIN user_information
ON user_information.userid = users.id
WHERE user_information.name = 'account_name'
),
(
SELECT user_information.value
FROM users
LEFT JOIN user_information
ON user_information.userid = users.id
WHERE user_information.name = 'account_code'
),
(
SELECT user_information.value
FROM users
LEFT JOIN user_information
ON user_information.userid = users.id
WHERE user_information.name = 'account_id'
),
WHERE ...
的部分:
SELECT user_information.value
FROM users
LEFT JOIN user_information
ON user_information.userid = users.id
恰恰是在每个子查询中的相同(会有将来约有10个子查询),但where子句每次都会改变。是否有可能将它保存在一个变量中,然后使用它,同时在mysql中追加每个不同的where子句?