Question

我只是从Postgres开始，然后发现自己在Query中制作了以下Postgres，旨在从4个不同的tables中获取数据。

SELECT
    table1.id,
    table2.icon,
    table3.title,
    table4.description
FROM
    table1
    JOIN table5 ON id_t5 = id_t3
    JOIN table3 ON id_t1 = id_t3
    AND id_t3 = 816
LEFT JOIN table2 ON table5.id_t2_fk = table2.id_t2 
LEFT JOIN table4 ON table4.id_t3_fk = table1.id_t1;

我的问题是，在生成UPDATE之后，我必须在这4个表中创建一个Query。

我想不出如何解决问题，因为UPDATE的{{1}}语法与Postgres或MySQL的语法不同。

我试图这样做：

SQLserver

Answer 1

Postgres允许您在CTE中进行更新。也许这就是您想要的：

with data as (
      select t1.id, t2.id_t2, t2.icon, t3.id_t3, t3.title,
             t4.id_t4, t4.description
      from table1 t1 join
           table5 t5 
           on id_t5 = id_t3 join
           table3 
           on id_t1 = id_t3 and id_t3 = 816 left join
           table2 t2
           on t5.id_t2_fk = t2.id_t2 left join
           table4 t4
           on t4.id_t3_fk = t1.id_t1
       where t1.id_t1= 816
      ),
      u2 as (
       update table2
           set icon = 'new icon'
           where t2.id_t3 in (select data.id_t2 from data)
       returning *
      ),
      u3 as (
       update table3
           set title = 'new title'
           where id_t3 in (select data.id_t3 from data)
       returning *
      )
update table4
   set description = 'new description'
   where id_t4 in (select data.id_t4 from data);

否则，类似的事情。

使用SELECT whit INNER JOIN多个表进行Postgres UPDATE

1 个答案: