MySql数据库中Select用法小结

一、条件筛选
1、数字筛选：sql = "Select * from [sheet1$] Where 销售单价 > 100"
2、字符条件：sql = "Select * from [sheet1$] Where 物品名称 ="挡泥板""
3、日期条件：sql = "Select * from [sheet1$] Where 物品名称 ="挡泥板""
4、区间条件：sql = "Select * from [sheet1$] Where 出库日期 between #2005-1-4# and #2005-1-10#"
5、多个条件：用and,OR连接

"sql = "Select * from [sheet1$] Where 出库日期 between #2005-1-4# and #2005-1-10# and 销售单价>100"

6、模糊条件：%表示任意多个字符,_（下划线）表示单个占位符

"sql = "Select * from [sheet1$] Where 物品名称 like "%扶手%""

7、插入变量查询:

"sr = "挡泥板""sql = "Select * from [sheet1$] Where 物品名称 ="" & sr & """

8、在字符串组里：

"sql = "Select * from [sheet1$] Where 物品名称 in（"车衣","扶手箱"）"

9、借用函数优化：

"sql = "Select * from [sheet1$] Where left（物品代码,3）="028""

二、指定筛选
1、筛选全部字段:*表示全部字段

"sql = "Select * from ChuKu"

2、筛选指定字段：在from前面列出要显示的所有字段,如果要跳过的用""""

"sql = "Select """",出库日期,"""",物品代码,"""",规格,单位 from ChuKu"

3、筛选不重复的：Distinct 字段名筛选不重复的记录

"sql = "Select Distinct """",物品代码 from ChuKu"

4、按百分比筛选:Top N percent 可以显示前百分之N的记录

"sql = "Select top 30 Percent * from ChuKu"

"对筛选的字段用函数进行进一步的处理和格式化

"sql = "Select ID,Format（出库日期,""yyyy-mm-dd""） from ChuKu"

5、排序:Desc降序,Asc升序

"sql = "Select * from ChuKu Order by 出库日期 asc,销售单价 desc""sql = "Select Top 10 * from ChuKu Order by 出库日期 asc,销售单价 desc" "筛选销售数量前10（）

三、分组显示
Group by 可以配合函数进行分组求和,分组求最大值等。

"sql = "Select """","""",物品代码,"""","""","""",sum（出库数量） from ChuKu group by 物品代码" " 跳过的用""""

按条件显示分组记录

"sql = "Select """","""",物品代码,"""","""","""",sum（出库数量） from ChuKu group by 物品代码 HAVING sum（出库数量）>=3"

以上所述是小编给大家介绍的MySql数据库中Select用法小结，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！