查询帐户运行余额 php

Question

请协助，如何为以下查询编写 php 代码：

SELECT transactions_id, trn_date, trn_dt_total, trn_ct_total, trn_description, trn_bank_reference, balance
FROM
(SELECT t.*, @n := IF(@g <> transactions_id, 0, @n) + 
COALESCE(trn_dt_total,0) - COALESCE(trn_ct_total, 0) balance, @g := 
transactions_id
FROM transactions t, (SELECT @n := 0) n, (SELECT @g := 0) g
WHERE trn_building_id = 1 and trn_unit_id = 1 and trn_tenant_id = 1
ORDER BY transactions_id, trn_date)
query

我的php页面查询

$details = $db->query();

当运行 MySql 中的查询没有 "query" 行时，我得到错误：

1248 - Every derived table must have its own alias

Answer 1

错误不言自明。您应该为您创建的 table 命名一个别名。在括号中的子查询之后，您应该写 as t_name 其中 tname 将是您的 table 别名

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