我一直在尝试寻找正确的方法来求和来自2个不同表的2行。
我可以使用以下两个查询轻松确定要累加的行:
select *
from vui_trading_review_form_client
where month = '201202' and client_id='TOTALS';
+--------+------------+-----------+-----------------+-----------------+-----------------+----------------+----------+
| month | dt_end | client_id | amt_balance_GBP | amt_balance_EUR | amt_balance_USD | dt_working_day | order_no |
+--------+------------+-----------+-----------------+-----------------+-----------------+----------------+----------+
| 201202 | 2012-02-29 | TOTALS | 2 | 3 | 4 | 2012-02-29 | 2 |
+--------+------------+-----------+-----------------+-----------------+-----------------+----------------+----------+
select *
from vui_trading_review_form_bank
where month = '201202' and provider='TOTALS';
+--------+------------+----------+-----------------+-----------------+-----------------+----------+
| month | dt_end | provider | amt_balance_GBP | amt_balance_EUR | amt_balance_USD | order_no |
+--------+------------+----------+-----------------+-----------------+-----------------+----------+
| 201202 | 2012-02-29 | TOTALS | 1 | 1 | 1 | 3 |
+--------+------------+----------+-----------------+-----------------+-----------------+----------+
我要实现的是一张如下表
+-----------------+-----------------+-----------------+
| amt_balance_GBP | amt_balance_EUR | amt_balance_USD |
+-----------------+-----------------+-----------------+
| 1 | 2 | 3 |
+-----------------+-----------------+-----------------+
前三个总数减去后三个总数。
我已经尝试过加入,但我确实在努力获得正确的结果。
任何建议将不胜感激。
最佳答案
尝试这个:
SELECT (a.amt_balance_GBP - b.amt_balance_GBP) Total_GBP,
(a.amt_balance_EUR - b.amt_balance_EUR) Total_EUR,
(a.amt_balance_USD - b.amt_balance_USD) Total_USD
FROM vui_trading_review_form_client a INNER JOIN vui_trading_review_form_bank b
on (a.Client_ID = b. provider) AND
(a.Month = b.Month)
WHERE a.month = '201202' and b.provider='TOTALS';
或者如果它不符合您的需求,请尝试使用
LEFT JOIN
SELECT (a.amt_balance_GBP - COALESCE(b.amt_balance_GBP,0)) Total_GBP,
(a.amt_balance_EUR - COALESCE(b.amt_balance_EUR,0)) Total_EUR,
(a.amt_balance_USD - COALESCE(b.amt_balance_USD,0)) Total_USD
FROM vui_trading_review_form_client a LEFT JOIN vui_trading_review_form_bank b
on (a.Client_ID = b. provider) AND
(a.Month = b.Month)
WHERE a.month = '201202' and b.provider='TOTALS';