复合求和：我想创建一个复合查询，它从两个不同的表中获取两列的单独总和，然后对它们求和

Posted 2023-05-08

【中文标题】复合求和：我想创建一个复合查询，它从两个不同的表中获取两列的单独总和，然后对它们求和

【英文标题】：Compound summation: I would like to create a compound query which gets the individual sum of two columns from two different tables and then sum them

【发布时间】：2021-11-03 18:20:06

【问题描述】：

select sum(saved_amount - withdrawal_amount) from goal_withdrawal as sum1;

union 

select suM(amount) from phone_verification as sum2;

select sum1  + sum2;

【参考方案1】：

您可以在 select 语句中使用 select 语句来获得所需的内容。 我已经制定了以下示例：

--Creating some fake-data
DECLARE @goal_withdrawal TABLE (saved_amount int, withdrawal_amount int);
INSERT INTO @goal_withdrawal VALUES (100,100);
INSERT INTO @goal_withdrawal VALUES (150,100);
INSERT INTO @goal_withdrawal VALUES (200,125);

DECLARE @phone_verification TABLE (amount int);
INSERT INTO @phone_verification VALUES (100);
INSERT INTO @phone_verification VALUES (150);

SELECT 
    (
        SELECT (SUM(saved_amount) - SUM(withdrawal_amount)) 
        FROM @goal_withdrawal
    ) AS sum1,
    (
        SELECT SUM(amount) 
        FROM @phone_verification
    ) AS sum2,
    (
        SELECT (SUM(saved_amount) - SUM(withdrawal_amount)) 
        FROM @goal_withdrawal
    ) 
    + 
    (
        SELECT SUM(amount) 
        FROM @phone_verification
    ) AS sum3

产生三列：

Sum1 为 125 Sum2 为 250 Sum3 为 375