Question

我已经使用PHP MYSQLi创建了资产负债表系统。管理员可以在哪里管理客户帐户信息。现在，我只想获取 DEBTORS （债权人）和 CREDITORS（债权人）。我正在使用action_type字段'dr'或'cr'管理这两个条目。

下面是表结构：

我尝试了以下查询以仅获取债务人：

SELECT *, client_id
     , SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) total_debits
     , SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) total_credits
     , SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) - SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) total_debtors
     , SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) - SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) balance 
  FROM tbl_balancesheet 
 GROUP  
    BY client_id
HAVING balance <> 0

但是它得到了债务人和债权人的所有结果。

如何使用查询或通过PHP代码仅获得债务人和债权人？

此外，如何在余额列中显示dr和cr？

请帮助！！！

谢谢

Answer 1

似乎您只需要修改HAVING子句，以过滤掉balance大于零（债务人）或balance小于零（证人）的情况

您还可以使用条件IF()表达式来确定balance列中的 dr / cr 。

仅获取债务人：

SELECT client_id, 
       Sum(Coalesce(CASE 
                      WHEN action_type = 'dr' THEN amount 
                    end, 0)) AS total_debits, 
       Sum(Coalesce(CASE 
                      WHEN action_type = 'cr' THEN amount 
                    end, 0)) AS total_credits, 
       Sum(Coalesce(CASE 
                      WHEN action_type = 'cr' THEN amount 
                    end, 0)) - Sum(Coalesce(CASE 
                                              WHEN action_type = 'dr' THEN 
                                              amount 
                                            end, 0)) AS total_debtors, 
       IF(Sum(Coalesce(CASE 
                         WHEN action_type = 'cr' THEN amount 
                       end, 0)) - Sum(Coalesce(CASE 
                                                 WHEN action_type = 'dr' THEN 
                                                 amount 
                                               end, 0)) > 0, 'dr', 'cr') AS balance 
FROM   tbl_balancesheet 
GROUP  BY client_id 
HAVING balance = 'dr' AND total_debtors <> 0

仅获得信用证：

SELECT client_id, 
       Sum(Coalesce(CASE 
                      WHEN action_type = 'dr' THEN amount 
                    end, 0)) AS total_debits, 
       Sum(Coalesce(CASE 
                      WHEN action_type = 'cr' THEN amount 
                    end, 0)) AS total_credits, 
       Sum(Coalesce(CASE 
                      WHEN action_type = 'cr' THEN amount 
                    end, 0)) - Sum(Coalesce(CASE 
                                              WHEN action_type = 'dr' THEN 
                                              amount 
                                            end, 0)) AS total_debtors, 
       IF(Sum(Coalesce(CASE 
                         WHEN action_type = 'cr' THEN amount 
                       end, 0)) - Sum(Coalesce(CASE 
                                                 WHEN action_type = 'dr' THEN 
                                                 amount 
                                               end, 0)) > 0, 'dr', 'cr') AS balance 
FROM   tbl_balancesheet 
GROUP  BY client_id 
HAVING balance = 'cr' AND total_debtors <> 0

Answer 2

如果我正确理解您的问题，则需要一个简单的WHERE语句。因此，您的查询应该是这样的：

SELECT *, client_id
     , SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) total_debits
     , SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) total_credits
     , SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) - SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) total_debtors
     , SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) - SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) balance 
  FROM tbl_balancesheet 
  WHERE `action_type` = 'cr'
 GROUP  
    BY client_id
HAVING balance <> 0

或者，不使用action_type列，而是使用计算出的列：

SELECT *, client_id
     , SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) total_debits
     , SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) total_credits
     , SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) - SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) total_debtors
     , SUM(COALESCE(CASE WHEN action_type = 'dr' THEN amount END,0)) - SUM(COALESCE(CASE WHEN action_type = 'cr' THEN amount END,0)) balance 
  FROM tbl_balancesheet 
  WHERE `action_type` = 'cr'
 GROUP  
    BY client_id
HAVING balance <> 0 AND total_credits > 0

第二个查询将返回所有拥有信用的人（因此为债权人）。这样行吗？

使用PHP MYSQLi如何只获得使用action_type DR和CR

2 个答案: