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IF Statements
BLOCK 1
.
IF a >= b THEN
do_this …..;
ELSE
do_that….;
END IF
BLOCK 2
.
IF a < b THEN
do_that …..;
ELSE
do_this….;
END IF;
• Given any pair of non-NULL values for “a” and”b”,
will Block 1 and Block 2 do the same thing?
• What if either “a” or”b” (or both) is NULL?

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