从2表中的SQL SELECT

Question

I have 2 same table with flowing column

id,
timestamp,
country,
data

table 1 is storing information for the country A , and table 2 is storing information for the country B

i need to do SELECT from both table ORDER BY timestamp

can anybody help me with best and correct way?

Thanks

Answer 1

Please try

(SELECT * FROM `table 1`)
UNION
(SELECT * FROM `table 2`)
ORDER BY timestamp;

Answer 2

SELECT * FROM tableA
UNION ALL
SELECT * FROM tableB

You need to apply ORDER BY to the combined (UNION'ed) resultset, so the final query will look like this:

SELECT * FROM (
    SELECT * FROM tableA
    UNION ALL
    SELECT * FROM tableB
) ORDER BY timestamp;

Answer 3

从表A中选择t1.id，t1.timestamp，t1.country，t1.data，t2.id，t2.timestamp，t2.country，t2.data作为t1，tableB作为t2的顺序由t1.timestamp;