我创建了一个存储过程,我想在其中添加一个替代 order by 子句。
问题是查询失败了“无效的列名'aantal regels'”
这是我现在的查询。
SELECT
l.lead_id,
l.afdeling_id,
l.advertentie_id,
l.naam,
l.type,
l.status,
l.herkomst,
l.aanmaakdatum,
l.klant_id,
l.overigegegevens,
af.afdelingsnaam,
(SELECT
COUNT(lead_regel_id)
FROM
Lead_regel As lr
Where
Lr.lead_id = l.lead_id And
lr.status <> 100
)
AS aantal_regels,
(SELECT
COUNT(lead_id)
FROM
Lead_unread As lu
Where
lu.lead_id = l.lead_id And
lu.user_id = @uid
)
As lead_ongelezen,
(SELECT
COUNT(lru.lead_regel_id)
FROM
Lead_regel As lr2
INNER JOIN
Lead_regel_unread As lru ON
lr2.lead_regel_id = lru.lead_regel_id
Where
lr2.lead_id = l.lead_id And
lru.user_id = @uid And
lr2.status <> 100
)
As lead_regel_ongelezen
FROM
Lead AS l
INNER JOIN
Afdeling AS af ON
l.afdeling_id = af.afdeling_id
WHERE
l.afdeling_id = @aid AND
l.status <> 100
ORDER BY
CASE WHEN @orderby = 'default' THEN l.aanmaakdatum END DESC,
CASE WHEN @orderby = 'type' THEN l.type END ASC,
CASE WHEN @orderby = 'naam' THEN l.naam END ASC,
CASE WHEN @orderby = 'reacties' THEN aantal_regels END DESC
希望有人可以帮助我!
最佳答案
您不能以这种方式按别名排序。
第一个选项是重复代码。注意:仅仅因为您重复了代码,SQL 引擎并不会太天真以至于再次执行它,它会重新使用结果。
ORDER BY
CASE WHEN @orderby = 'default' THEN l.aanmaakdatum END DESC,
CASE WHEN @orderby = 'type' THEN l.type END ASC,
CASE WHEN @orderby = 'naam' THEN l.naam END ASC,
CASE WHEN @orderby = 'reacties' THEN (SELECT
COUNT(lead_regel_id)
FROM
Lead_regel As lr
WHERE
Lr.lead_id = l.lead_id And
Lr.status <> 100
) END DESC
或者这一切都使用子查询......
SELECT
*
FROM
(
yourQuery
)
AS sub_query
ORDER BY
CASE WHEN @orderby = 'default' THEN aanmaakdatum END DESC,
CASE WHEN @orderby = 'type' THEN type END ASC,
CASE WHEN @orderby = 'naam' THEN naam END ASC,
CASE WHEN @orderby = 'reacties' THEN aantal_regels END DESC
关于sql - "Invalid column name",按子查询别名排序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10799558/