# 第七章 使用数字

- [7.1 计算平均值](/sql/di-qi-zhang-shi-yong-shu-zi/7.1-ji-suan-ping-jun-zhi.md)
- [7.2 求某列中的最小/最大值](/sql/di-qi-zhang-shi-yong-shu-zi/7.2-qiu-mou-lie-zhong-de-zui-xiao-zui-da-zhi.md)
- [7.3 对某列的值求和](/sql/di-qi-zhang-shi-yong-shu-zi/7.3-dui-mou-lie-de-zhi-qiu-he.md)
- [7.4 求一个表的行数](/sql/di-qi-zhang-shi-yong-shu-zi/7.4-qiu-yi-ge-biao-de-hang-shu.md)
- [7.5 求某列值的个数](/sql/di-qi-zhang-shi-yong-shu-zi/7.5-qiu-mou-lie-zhi-de-ge-shu.md)
- [7.6 生成累计和](/sql/di-qi-zhang-shi-yong-shu-zi/7.6-sheng-cheng-lei-ji-he.md)
- [7.7 生成累乘积](/sql/di-qi-zhang-shi-yong-shu-zi/7.7-sheng-cheng-lei-cheng-ji.md)
- [7.8 计算累计差](/sql/di-qi-zhang-shi-yong-shu-zi/7.8-ji-suan-lei-ji-cha.md)
- [7.9 计算模式](/sql/di-qi-zhang-shi-yong-shu-zi/7.9-ji-suan-mo-shi.md)
- [7.10 计算中间值](/sql/di-qi-zhang-shi-yong-shu-zi/7.10-ji-suan-zhong-jian-zhi.md)
- [7.11 求总和的百分比](/sql/di-qi-zhang-shi-yong-shu-zi/7.11-qiu-zong-he-de-bai-fen-bi.md)
- [7.12 对可空列作聚集](/sql/di-qi-zhang-shi-yong-shu-zi/7.12-dui-ke-kong-lie-zuo-ju-ji.md)
- [7.13 计算不包含最大值和最小值的均值](/sql/di-qi-zhang-shi-yong-shu-zi/7.13-ji-suan-bu-bao-han-zui-da-zhi-he-zui-xiao-zhi-de-jun-zhi.md)
- [7.14 把字母数字串转换为数值](/sql/di-qi-zhang-shi-yong-shu-zi/7.14-ba-zi-mu-shu-zi-chuan-zhuan-huan-wei-shu-zhi.md)
- [7.15 更改累计和中的值](/sql/di-qi-zhang-shi-yong-shu-zi/7.15-geng-gai-lei-ji-he-zhong-de-zhi.md)