laravel

Question

╔═══╦══════════════╦═════════════╗
║   ║id            ║name         ║
╠═══╬══════════════╬═════════════╣
║   ║ 1            ║a1           ║
║   ║ 2            ║b1           ║
║   ║ 3            ║b2           ║
║   ║ 4            ║c1           ║
║   ║ 5            ║c2           ║
╚═══╩══════════════╩═════════════╝

这是我在 mysql

中的 table

正在 mysql 中执行此查询：

select * from (select * from courses where name like 'a%') as t1 cross join (select * from courses where name like 'b%') as t2 cross join (select * from courses where name like 'c%') as t3

returns这个：

然而，当我尝试运行在 larael 上显示结果时，我得到了一些不同的结果。

这就是我在 laravel 中的执行方式：

$posts = DB::select(DB::raw("select * from (select * from courses where name like 'a%') as t1 cross join (select * from courses where name like 'b%') as t2 cross join (select * from courses where name like 'c%') as t3"));

这就是 $posts returns :

[{"id":4,"name":"c1"},{"id":4,"name":"c1"},{"id":5,"name":"c2"},{"id":5,"name":"c2"}]

我想它只返回查询的最后两列，如果我们将它与 mysql 上返回的原始结果进行比较。

知道如何得到完整的结果吗？

Answer 1

t3 覆盖 t1 和 t2 的值。您必须使用别名：

select t1.id as t1_id, t1.name as t1_name,
    t2.id as t2_id, t2.name as t2_name,
    t3.id as t3_id, t3.name as t3_name

您还应该使用 query builder 而不是原始 SQL。

laravel - 交叉连接不返回所有列

laravel - cross join not returning all columns

php

sql