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
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'sql = "Select * from [sheet1$] Where 出库日期 between #2005-1-4# and #2005-1-10# and 销售单价>100" |
6、模糊条件：%表示任意多个字符,_(下划线)表示单个占位符
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'sql = "Select * from [sheet1$] Where 物品名称 like '%扶手%'" |
7、插入变量查询:
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'sr = "挡泥板"'sql = "Select * from [sheet1$] Where 物品名称 ='" & sr & "'" |
8、在字符串组里：
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'sql = "Select * from [sheet1$] Where 物品名称 in('车衣','扶手箱')" |
9、借用函数优化：
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'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
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'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""""
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'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
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'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
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'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
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'sql = "Select ID,Format(出库日期,""yyyy-mm-dd"") from ChuKu" |
5、排序:Desc降序,Asc升序
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'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。
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'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
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'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服务器之家网站的支持！
