使用LIMIT语句组合两个sql select查询(在postgres中)

Question

我有一个表,我想要一个查询,返回创建的最后10条记录加上id为x的记录.

我正在努力 -

SELECT * FROM catalog_productimage
ORDER BY date_modified
LIMIT 10
UNION
SELECT * FROM catalog_productimage
WHERE id=5;

但它看起来不像我LIMIT之前可以放在那里UNION.我尝试添加另一列并使用它进行排序 -

SELECT id, date_modified, IF(false, 1, 0) as priority FROM catalog_productimage
UNION
SELECT, id, date_modified, IF(true, 1, 0) as priority FROM catalog_productimage
WHERE id=5
ORDER BY priority, date_modified
LIMIT 10;

但我没有取得多大进展..

Answer 1

刚检查一下这是否有效:

(SELECT * FROM catalog_productimage
ORDER BY date_modified
LIMIT 10)
UNION
SELECT * FROM catalog_productimage
WHERE id=5;