explain these select statements!
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Published on 2010-04-30T16:22:32Z
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2010/04/30
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Hi, I can not get the difference betwwn these statements? would you please help me,I have read some sample of select statements but I did not get these ones.
SELECT 'B' FROM T WHERE A = (SELECT NULL);
SELECT 'C' FROM T WHERE A = ANY (SELECT NULL);
SELECT 'D' FROM T WHERE A = A;
I use MySQL
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