我可以不使用视图直接连接 SELECT 语句吗？

发布于 2024-10-02 13:15:12 字数 271 浏览 3 评论 0原文

是否可以在不创建视图的情况下执行以下操作？即直接加入这些 SELECT ？

CREATE VIEW temp_first AS SELECT MIN(DATE) AS mindate,id FROM mytable GROUP BY id
#
SELECT *, t.mindate FROM aggregate_analysis a
JOIN temp_first t
ON t.id = a.id 
WHERE (.... ) 
ORDER BY mindate DESC

原文

Is it possible to do the following without a creating a view in between? I.e. by just joining these SELECTs directly?

CREATE VIEW temp_first AS SELECT MIN(DATE) AS mindate,id FROM mytable GROUP BY id
#
SELECT *, t.mindate FROM aggregate_analysis a
JOIN temp_first t
ON t.id = a.id 
WHERE (.... ) 
ORDER BY mindate DESC

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忆梦 2024-10-09 13:15:12

您应该能够用子查询/子选择替换选择中的视图引用。

查看

FROM 子句中的子查询
MySQL 中的子查询，第 1 部分请参阅假装是一个表

类似的东西

SELECT  *, 
        t.mindate 
FROM    aggregate_analysis a JOIN 
        (
            SELECT  MIN(DATE) AS mindate,
                    id 
            FROM    mytable 
            GROUP BY id
        ) as t  ON t.id = a.id  
WHERE   (.... )  
ORDER BY    mindate DESC

You should be able to replace the view refernce in the select with a sub query/sub select.

Have a look at

Subqueries in the FROM Clause
Subqueries in MySQL, Part 1 see Pretending to be a Table

Something like

SELECT  *, 
        t.mindate 
FROM    aggregate_analysis a JOIN 
        (
            SELECT  MIN(DATE) AS mindate,
                    id 
            FROM    mytable 
            GROUP BY id
        ) as t  ON t.id = a.id  
WHERE   (.... )  
ORDER BY    mindate DESC

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