SELECT class table number of classes,
class table class name,
SUM (DECODE (sex, '1', 1)) girls number,
SUM (DECODE (sex, '0', 1)) male persons
FROM student table, class table
.. WHERE student table class = class number table number of classes
.. GROUP BY class table number of classes, class table class name;
Statistics oracle same field 0 and 1
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Origin www.cnblogs.com/uranusyo/p/11361547.html
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