How to conditional select table rows using SQL

How do I query this table if I wanna select rows with same CHANGE_KEY and SYSTEM_KEY = 1 and SERVER_KEY = 2, to clarify I'm not interesting in rows with only SYSTEM_KEY = 1 like the first row in the following table because SERVER_KEY = 2 is also needed, a correct result table will only contain the two last rows in the following table because the CHAN开发者_StackOverflow社区GE_KEY 4 has both SYSTEM_KEY=1 and SERVER_KEY=2

   CHANGE_KEY  SYSTEM_KEY  SERVER_KEY  HARDWARE_KEY
    ----------- ----------- ----------- ------------
    1           1           NULL        NULL
    1           NULL        1           NULL
    1           NULL        NULL        1
    2           NULL        1           NULL
    3           NULL        1           NULL
    4           NULL        1           NULL
    5           NULL        1           NULL
    5           NULL        1           NULL
    4           NULL        2           NULL
    4           1           NULL        NULL

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Unless I'm missing something, it's as easy as this.

Select * From MyTable Where Change_Key = 4 AND (System_Key = 1 OR System_Key = 2)

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SELECT * FROM
table 
WHERE CHANGE_KEY = 4
AND 
    (
     SYSTEM_KEY = 1
     OR
     SERVER_KEY = 2
    )

EDIT: I made changes, following your edit.

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SELECT *
FROM mytable
WHERE CHANGE_KEY = 4
AND (SYSTEM_KEY = 1
OR SERVER_KEY = 2)

Edit: You've edited the question to say that the last two rows in the table should be in the result-set. However, an AND will not achieve this, I believe you're looking for an OR so have modified my response.

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SELECT * FROM your_table WHERE change_key = 4 AND system_key = 1 AND server_key = 2

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In MySql, i would write something like this:

SELECT * FROM table_name WHERE CHANGE_KEY=4 AND SYSTEM_KEY=1 AND SERVER_KEY=2;

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SELECT * FROM table_name WHERE change_key = 4 AND system_key = 1 AND system_key = 2