Oracle 5.0 Reference Manual page 1030

+--------+---------------+------+-----+---------+-------+
| AVG(i) | decimal(14,4) | YES
| AVG(d) | decimal(14,4) | YES
| AVG(f) | double
+--------+---------------+------+-----+---------+-------+
From MySQL 5.0.3 to 5.0.6, the first two columns are DECIMAL(64,0).
Precision Math Examples
| | NULL
| | NULL
| YES | | NULL
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