如何将两个查询的结果与排序结合在一起? [英] How do I combine the results of two queries with ordering?

问题描述

您如何将2个查询的结果按日期排序?

How do you join the results of 2 queries, ordering by date?

SELECT * FROM table1 WHERE tag='1'
SELECT * FROM table2 WHERE tag='3'

table1，table2具有相同的字段: id|article|author|tag|date

table1,table2 have the same fields: id|article|author|tag|date

PS:顺便说一句，标签是workid

PS: BY THE WAY, tag IS workid

推荐答案

您可以使用

You can use UNION ALL to get rows from both tables:

SELECT id, article, author, tag, date FROM table1 WHERE tag = '1'
UNION ALL
SELECT id, article, author, tag, date FROM table2 WHERE tag = '3'
ORDER BY date

---

您可能还想考虑重组数据库，以使您不使用两个表，而只使用一个带有字段的单个表来区分每一行的类型.然后，查询可以简化为:

---

You may also want to consider restructuring your database so that instead of using two tables you use just a single table with a field to distinguish the type of each row. Then the query can simplify to:

SELECT id, article, author, tag, date
FROM yourtable
WHERE (tag, type) IN (('1','type1'), ('3','type2'))
ORDER BY date

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