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我在选择具有最高显示优先级的组时遇到问题。查询是：

SELECT
    xf_user_group_relation.user_id, xf_user_field_value.field_value as custom_flags,
    xf_user_external_auth.provider_key,
    xf_user_group_relation.user_group_id,
    MAX( xf_user_group.display_style_priority ) AS display_style_priority,
    xf_user_group_relation.user_group_id IN(5,6,11,12) AS is_vip
FROM xf_user_group_relation
INNER JOIN xf_user_group
    ON xf_user_group_relation.user_group_id = xf_user_group.user_group_id
INNER JOIN xf_user_external_auth
    ON xf_user_group_relation.user_id = xf_user_external_auth.user_id
LEFT JOIN xf_user_field_value
    ON xf_user_group_relation.user_id = xf_user_field_value.user_id
    AND xf_user_field_value.field_id = 'gtarp_custom_flags'
WHERE
    xf_user_external_auth.provider = 'steam'
    AND xf_user_group.display_style_priority >= 1000
    AND xf_user_group_relation.user_group_id NOT IN(19,20)
GROUP BY
    xf_user_group_relation.user_id,
    xf_user_external_auth.provider_key

似乎它选择了具有最低 id 的组，这不是我想要的。我希望它选择具有最高显示优先级的组。

所以 user_group_id 应该是显示优先级最高的组，即MAX( xf_user_group.display_style_priority)

4

1 回答 1

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尝试这个：

SELECT
    xf_user_group_relation.user_id, xf_user_field_value.field_value as custom_flags,
    xf_user_external_auth.provider_key,
    xf_user_group_relation.user_group_id,
    MAX( xf_user_group.display_style_priority ) AS display_style_priority,
    xf_user_group_relation.user_group_id IN(5,6,11,12) AS is_vip
FROM xf_user_group_relation
INNER JOIN xf_user_group
    ON xf_user_group_relation.user_group_id = xf_user_group.user_group_id
INNER JOIN xf_user_external_auth
    ON xf_user_group_relation.user_id = xf_user_external_auth.user_id
LEFT JOIN xf_user_field_value
    ON xf_user_group_relation.user_id = xf_user_field_value.user_id
    AND xf_user_field_value.field_id = 'gtarp_custom_flags'
WHERE
    xf_user_external_auth.provider = 'steam'
    AND xf_user_group.display_style_priority >= 1000
    AND xf_user_group_relation.user_group_id NOT IN(19,20)
GROUP BY
    xf_user_group.display_style_priority,
    xf_user_group_relation.user_id,
    xf_user_external_auth.provider_key
于 2012-08-06T22:59:20.680 回答