Question

我有两个问题。我必须执行两个查询并返回相同的结果对象。例如

$query1 = "SELECT name,age from students";
$query2 = "SELECT name,age from users";
$result1 = $this->db->query($query1)
$result2 = $this->db->query($query2)
 return result1 and result 2 together ;

我必须在同一个对象中返回两个查询的结果。请帮帮我

实际查询是::

SELECT dev_members.name,dev_members.id,dev_members.age,dev_members.family_id,dev_family.house_name,dev_ib_account_registration.account_id FROM (dev_members) 
JOIN dev_family ON dev_family.id=dev_members.family_id
JOIN dev_ib_account_registration ON dev_ib_account_registration.member_id=dev_members.id
           UNION
SELECT dev_members.name,dev_members.id,dev_members.age,dev_members.family_id, dev_family.house_name,dev_ib_sub_member_registration.account_id FROM (dev_members) 
JOIN dev_family ON dev_family.id=dev_members.family_id
JOIN dev_ib_sub_member_registration ON dev_ib_sub_member_registration.member_id=dev_members.id

Answer 1

您可以使用UNION

$query = "SELECT name,age from students 
          UNION
          SELECT name,age from users";
$result = $this->db->query($query);

或者，如果您想识别表行所属的记录，那么

$query = "SELECT name,age, 'students ' AS `table_type` from students 
          UNION
          SELECT name,age, 'users' AS `table_type` from users";
$result = $this->db->query($query);

Answer 2

您可能想在询问之前先搜索一个问题。

Here已经回答了同样的问题。

Answer 3

$query = "SELECT name,age from students UNION ALL SELECT name,age from users";

您需要在查询中使用UNION ALL而不是UNION

SELECT dev_members.name,dev_members.id,dev_members.age,dev_members.family_id,dev_family.house_name,dev_ib_account_registration.account_id FROM (dev_members) 
JOIN dev_family ON dev_family.id=dev_members.family_id
JOIN dev_ib_account_registration ON dev_ib_account_registration.member_id=dev_members.id
           UNION ALL
SELECT dev_members.name,dev_members.id,dev_members.age,dev_members.family_id, dev_family.house_name,dev_ib_sub_member_registration.account_id FROM (dev_members) 
JOIN dev_family ON dev_family.id=dev_members.family_id
JOIN dev_ib_sub_member_registration ON dev_ib_sub_member_registration.member_id=dev_members.id

当UNION ALL保留副本时，UNION会删除最终结果集中的重复行。

Codeigniter结合了两个结果

3 个答案: