Question

这是我上次尝试过的。

    (
SELECT  
`offers`.`id` AS `offer`, `offers`.`date` 
from `offers`
WHERE `offers`.`expired`='0'
ORDER BY `offers`.`date` DESC LIMIT 10
)
UNION ALL
(
SELECT  
`vlog`.`video`,
`vlog`.`updated`
from `vlog`
ORDER BY `vlog`.`date` DESC LIMIT 10
)

为简单起见，我只有两列。我需要按日期排序（不是上面代码提供的相同结果），并显示哪个是优惠，哪个是视频。这是否可能没有链接表的列。？

Answer 1

我假设video.video是一个ID，因为它与顶部查询中的id列对齐。您可以在两个查询中选择一个文字字符串，以指示它来自哪个查询：

SQL Fiddle

SELECT
    'offer' AS type,
    id,
    date
FROM
    offers
WHERE
    expired = 0
UNION
SELECT
    'video' AS type,
    video AS id,
    updated AS date
FROM
    vlog
ORDER BY
    date

打印两个表的结果，没有按日期排序的公共列

1 个答案:

SQL Fiddle