sql - 如何在 MySQL 的两列上执行布尔逻辑？

Question

我想在 MySql 中做一个选择，它结合了几列......像这样的伪代码：

SELECT payment1_paid AND payment2_paid AS paid_in_full 
FROM denormalized_payments 
WHERE payment1_type = 'check';

编辑： payment1_paid 和 payment2_paid 是布尔值。

除了MySql，我不能使用任何其他语言来解决这个特定问题。

谢谢你的帮助！

编辑：对于所有给我求和和连接建议的人，我很抱歉，但我已经投票赞成那些早期的答案，因为它们无论如何都是有用的。感谢大家的快速回答！

score 5 · Accepted Answer

好的，为了合乎逻辑，你可以做

Select (payment1_paid && payment2_paid) as paid_in_full 
from denormalized_payments 
where payment1_type = 'check';

score 2 · Accepted Answer

做就是了

Select CONCAT(payment1_paid, payment2_paid) as paid_in_full 
from denormalized_payments 
where payment1_type = 'check';

您可以连接任意数量的字段。

score 2 · Accepted Answer

如果通过组合你的意思是连接，那么这将起作用：

select concat(payment1_paid, payment2_paid) as paid_in_full
from denormalized_payments where payment1_type = 'check';

如果通过组合你的意思是添加，那么这应该工作：

select payment1_paid + payment2_paid as paid_in_full
from denormalized_payments where payment1_type = 'check';

[编辑]

对于布尔 AND：

select payment1_paid && payment2_paid as paid_in_full
from denormalized_payments where payment1_type = 'check';

score 1 · Accepted Answer

我不确定，但你的意思是连接吗？

SELECT CONCAT(ColumnA, ColumnB) AS ColumnZ
FROM Table

score 1 · Accepted Answer

1

SELECT IF(payment1_paid = 1 AND payment2_paid = 1, 1, 0) AS paid_in_fill

于 2008-10-29T22:46:51.530 回答

score 0 · Accepted Answer

如果是字符串（或者您想将要组合的列视为字符串），您可以使用CONCAT和CONCAT_WS。祝你好运！

score 0 · Accepted Answer

select (payment1_paid && payment2_paid) as paid_in_full
from denormalized_payments where payment1_type = 'check';

7 回答 7