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ssinfod/gist:e59ed417fe3bc870ac0f6f13e00b8c02

Created April 9, 2018 17:05
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Question sql.
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gistfile1.txt
GOOD: The following is OK because ID is not used twice in the same SITE
ID SITE
A 1
B 1
C 1
A 2
B 2
C 2
BAD: This is bad because ID B is used twice in the same SITE.
ID SITE
A 1
B 1
B 1
A 2
B 2
C 2
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