Question

我有表Contracts：

CREATE TABLE `Contracts` (
    `id` INT(11) NOT NULL AUTO_INCREMENT,
    `supplier_id` INT(11) NOT NULL,
    `shop_id` INT(11) NOT NULL,
    `conclusionDate` DATE NOT NULL,
    `period` INT(11) NOT NULL,
    PRIMARY KEY (`id`),
    CONSTRAINT `FK_Contracts_Shop` FOREIGN KEY (`shop_id`) REFERENCES `shop` (`id`),
    CONSTRAINT `FK_Contracts_Suppliers` FOREIGN KEY (`supplier_id`) REFERENCES `suppliers` (`id`)
)

我想创建这样的东西：

SELECT 
    c.id, 
    s.name as supplierName,
    c.conclusionDate, 
    c.conclusionDate+year(c.period) as cancelDate, 
    c.period
FROM
    Contracts as c
INNER JOIN
    Suppliers as s
ON 
    s.id = c.supplier_id

这是我目前的观点代码。因此，我想要从结束日期（period字段 - 日期类型）获取取消日期为日期的行，其中包含年份（conclusionDate字段 - 整数类型）的偏移量。

昨天，我看到了这样的例子，但我现在找不到了:(请帮帮我。

预期结果：

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ id + supplierName + conclusionDate + cancelDate + period +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 1  + bob1         + 2014-05-05     + 2015-05-05 + 1      +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 2  + bob2         + 2014-01-01     + 2018-05-05 + 4      +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ 3  + bob3         + 2012-08-03     + 2017-08-03 + 5      +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Answer 1

尝试使用interval添加您的句点列与您的结论日期

c.conclusionDate + interval c.period year as cancelDate

Demo

Answer 2

这应该有用。

ADDDATE(c.conclusionDate, INTERVAL c.period YEAR) as cancelDate,

如何使用现有字段（表的另一个字段）中的某些偏移量（表的字段）在视图中创建新字段？

2 个答案:

Demo