SELECT unit.*, sum( detail.order_money ) order_amount, sum( detail.one_commission ) one_commission, sum( detail.two_commission ) two_commission, ( sum( detail.two_commission ) + sum( detail.one_commission ) ) AS total_commission FROM profit_dividend_unit unit LEFT JOIN profit_dividend_detail detail ON unit.dividend_code = detail.dividend_code 修改改条sql，需要左表全部数据，没有对应的右表字段则显示空

可以使用 `LEFT OUTER JOIN`，同时使用 `COALESCE` 函数来将没有对应的右表字段显示为空。

修改后的 SQL 如下所示：

SELECT unit.*, 
       COALESCE(sum(detail.order_money), 0) as order_amount, 
       COALESCE(sum(detail.one_commission), 0) as one_commission, 
       COALESCE(sum(detail.two_commission), 0) as two_commission, 
       COALESCE((sum(detail.two_commission) + sum(detail.one_commission)), 0) as total_commission
FROM profit_dividend_unit unit 
LEFT OUTER JOIN profit_dividend_detail detail ON unit.dividend_code = detail.dividend_code 
GROUP BY unit.unit_id

在这个修改后的 SQL 中，我们使用了 `COALESCE` 函数，将可能为空的字段替换成了 0，确保了结果集中每一列都有值。同时，我们也保留了左表的全部数据，即使在右表中没有对应的记录。

相关问题

SELECT unit.*, COALESCE(sum(detail.order_money), 0) as order_amount, COALESCE(sum(detail.one_commission), 0) as one_commission, COALESCE(sum(detail.two_commission), 0) as two_commission, COALESCE((sum(detail.two_commission) + sum(detail.one_commission)), 0) as total_commission FROM profit_dividend_unit unit LEFT OUTER JOIN profit_dividend_detail detail ON unit.dividend_code = detail.dividend_code GROUP BY unit.unit_id 这个不使用GROUP BY，怎么写？

如果不使用 GROUP BY 子句，则可以使用子查询来实现相同的结果。例如：

SELECT unit.*,
(SELECT COALESCE(SUM(order_money), 0) FROM profit_dividend_detail WHERE dividend_code = unit.dividend_code) as order_amount,
(SELECT COALESCE(SUM(one_commission), 0) FROM profit_dividend_detail WHERE dividend_code = unit.dividend_code) as one_commission,
(SELECT COALESCE(SUM(two_commission), 0) FROM profit_dividend_detail WHERE dividend_code = unit.dividend_code) as two_commission,
(SELECT COALESCE(SUM(one_commission), 0) + COALESCE(SUM(two_commission), 0) FROM profit_dividend_detail WHERE dividend_code = unit.dividend_code) as total_commission
FROM profit_dividend_unit unit;

该语句将返回与原始查询相同的结果，但是使用了子查询来替代 GROUP BY 子句。

SELECT sum(t.pay_amount)+sum(t.promotion_amount)+SUM(t.author_coupon_subsidy)+SUM(t.actual_zt_pay_promotion)+SUM(t.actual_zr_pay_promotion)+SUM(t.refund_amount)+SUM(t.jylp_wp_amount)+SUM(t.post_amount)+SUM(t.promotion_amount_yf) as 'b_amount',\n" + "SUM(t.platform_service_fee)+SUM(t.commission)+SUM(t.channel_fee)+SUM(t.colonel_service_fee)+SUM(t.channel_promotion_fee)+SUM(t.other_sharing_amount)+SUM(t.yfx_amount)+SUM(t.jylp_yp_amount) as 's_amount'\n" + "from dy_settlement_push_input t where t.deleted = '0'

这是一条 SQL 查询语句，目的是查询 dy_settlement_push_input 表中满足条件（deleted = '0'）的记录中，各种金额字段的总和。具体来说，该语句计算了以下金额：

1. pay_amount：支付金额
2. promotion_amount：促销优惠金额
3. author_coupon_subsidy：优惠券补贴金额
4. actual_zt_pay_promotion：直通车支付优惠金额
5. actual_zr_pay_promotion：直冲支付优惠金额
6. refund_amount：退款金额
7. jylp_wp_amount：加油礼品卡支付金额
8. post_amount：邮费金额
9. promotion_amount_yf：促销优惠金额（应付）
10. platform_service_fee：平台服务费
11. commission：佣金
12. channel_fee：渠道费用
13. colonel_service_fee：团长服务费
14. channel_promotion_fee：渠道促销费用
15. other_sharing_amount：其他分摊金额
16. yfx_amount：邮费险金额
17. jylp_yp_amount：加油礼品卡优惠金额

最终会返回两个金额总和，分别是 b_amount 和 s_amount。