Php 显示记录的sql条件

tbl_用户

u_id | u_type | u_first_name
 1      U        I_am_user
 2      E        I_am_emp   
 3      E        I_am_emp2

tbl_订单

o_id | u_id | e_id | o_status | pay_status
  1     1       0    pending    Unpaid
  2     1       2    pick       Paid
  3     1       0    pending    Unpaid
  4     1       3    Pick       paid

我尝试了这个查询来显示用户和emp名称

SELECT o.*, a.u_first_name as user, b.u_first_name as emp
  FROM `tbl_order` AS o
       LEFT JOIN tbl_users AS a ON a.u_id = o.u_id 
       LEFT JOIN tbl_users AS b ON b.u_id = o.e_id

o_id | u_id | e_id |  user |  emp | pay_staus

我们如何给出条件（order by或other 1）以首先显示未付（

pay_status

）记录 然后

e\u id=0

记录然后全部休息？

尝试以下操作：

select * from(
SELECT o.*, a.u_first_name as user, b.u_first_name as emp, 0 as rnk 
FROM `tbl_order` AS o
LEFT JOIN tbl_users AS a ON a.u_id = o.u_id 
LEFT JOIN tbl_users AS b ON b.u_id = o.e_id
where pay_status='Unpaid'    
union all
SELECT o.*, a.u_first_name as user, b.u_first_name as emp, 1 as rnk 
FROM `tbl_order` AS o
LEFT JOIN tbl_users AS a ON a.u_id = o.u_id 
LEFT JOIN tbl_users AS b ON b.u_id = o.e_id
where pay_status!='Unpaid' and    e_id=0
union all
SELECT o.*, a.u_first_name as user, b.u_first_name as emp, 2 as rnk 
FROM `tbl_order` AS o
LEFT JOIN tbl_users AS a ON a.u_id = o.u_id 
LEFT JOIN tbl_users AS b ON b.u_id = o.e_id
where pay_status!='Unpaid' and    e_id!=0)a
order by rnk

---

您从

WHERE

子句中的查询应如下所示：

WHERE e_id = 0 OR pay_status = 'Unpaid'
ORDER BY pay_status DESC;

SELECT o.*, a.u_first_name as user, b.u_first_name as emp
  FROM `tbl_order` AS o
       LEFT JOIN tbl_users AS a ON a.u_id = o.u_id 
       LEFT JOIN tbl_users AS b ON b.u_id = o.e_id
  WHERE e_id = 0 OR pay_status = 'Unpaid'
  ORDER BY pay_status DESC;

ORDER BY pay_status DESC, e_id ASC;

所以你的整个查询应该是这样的：

WHERE e_id = 0 OR pay_status = 'Unpaid'
ORDER BY pay_status DESC;

SELECT o.*, a.u_first_name as user, b.u_first_name as emp
  FROM `tbl_order` AS o
       LEFT JOIN tbl_users AS a ON a.u_id = o.u_id 
       LEFT JOIN tbl_users AS b ON b.u_id = o.e_id
  WHERE e_id = 0 OR pay_status = 'Unpaid'
  ORDER BY pay_status DESC;

ORDER BY pay_status DESC, e_id ASC;

编辑：（）

如果要按特定顺序显示所有记录，只需使用如下子句：

WHERE e_id = 0 OR pay_status = 'Unpaid'
ORDER BY pay_status DESC;

SELECT o.*, a.u_first_name as user, b.u_first_name as emp
  FROM `tbl_order` AS o
       LEFT JOIN tbl_users AS a ON a.u_id = o.u_id 
       LEFT JOIN tbl_users AS b ON b.u_id = o.e_id
  WHERE e_id = 0 OR pay_status = 'Unpaid'
  ORDER BY pay_status DESC;

ORDER BY pay_status DESC, e_id ASC;

---

你不能按付款方式下订单吗？我试过了，但我们如何给出下一个条件？未付的e_id=0您是指订单按1、2、3等顺序排列吗？输出就像是先显示所有未付的记录（在同一输出中），然后所有未付的都是e_id=0的记录，其余的都是。请发布您想要的结果集我们如何避免“where”条件。。。。因为它只显示e_id=0，所以输出类似于1）所有未付记录2）当所有未付记录超过显示e_id=0时3）当所有e_id=0记录超过显示rest时all@Anu由于您没有回复，我们无法为您提供更多帮助。选择o.*，a.u_first_name作为用户，b.u_first_name as emp FROM

tbl_order

as o LEFT JOIN tbl_users as a ON a.u_id=o.u_id LEFT JOIN tbl_users as b ON b.u_id=o.e_id此查询是否返回任何信息？