将AVERAGE（Price）添加到mySQL查询中？

Question

我有以下查询

$query = "SELECT * FROM used ".$conditionString." ORDER BY id DESC LIMIT $offset, $rec_limit";

但现在我想知道返回行的平均价格

AVG(Price) AS PriceAverage

怎么做？

Answer 1

这应该适合你：

$query = "SELECT *,AVG(Price) FROM used ".$conditionString." ORDER BY id DESC 
GROUP BY id WITH ROLLUP 
LIMIT $offset, $rec_limit";

演示：http://sqlfiddle.com/#!2/4938f/1/0