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HAVING DISTINCT ORDERBY GROUPBY
HAVING DISTINCT ORDER BY GROUP BY
if(x>0)y=1
else if(x<0)y=-1;
else y=O; if(x)
if(x>0)y=1;
else if(x<0)y=-1; y=-1;
if(x)
if(x>0)y=1;
else if(x==0)y=0;
else y=-1; y=0;
if(x>=0)
if(x>0)y=1;
else y=-1;
WHERE FROM GROUP BY ORDER BY
按要求显示部分查询记录 消除重复出现的查询记录 删除查询结果中符合条件的记录 对查询结果进行排序
ORDER BY WHERE GROUP BY FROM