Question

I have 2 Tables.

1.Message - Sender_Number,SMS,DateTime.
2.Replies - Receiver_Number,SMS,DateTime.

I want to combine all the Columns and merge the 2 DateTime Columns into one Column and order by the time.

For example:

Messages Table:
123 | Hello there. | 2012-10-22 3:50
121 | HI I like U..| 2012-10-22 9:10

Replies Table:
123 | how are u... | 2012-10-22 5:50
121 | HI I like U2 | 2012-10-22 9:30

DESIRED OUTPUT (In 1 table):
123 | Hello there. | 2012-10-22 3:50 
123 | how are u... | 2012-10-22 5:50 
121 | HI I like U..| 2012-10-22 9:10 
121 | HI I like U2 | 2012-10-22 9:30 

Answer 1

SELECT *
FROM
(
    SELECT col1, col2, col3 FROM messages
    UNION ALL
    SELECT col1, col2, col3 FROM replies
) x
ORDER BY col3

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