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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1 | 'sql = "Select * from [sheet1$] Where 出库日期 between #2005-1-4# and #2005-1-10# and 销售单价>100" |
6、模糊条件:%表示任意多个字符,_(下划线)表示单个占位符
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1 | 'sql = "Select * from [sheet1$] Where 物品名称 like ' %扶手%'" |
7、插入变量查询:
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12 | 'sr = "挡泥板" ' sql = "Select * from [sheet1$] Where 物品名称 ='" & sr & "'" |
8、在字符串组里:
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1 | 'sql = "Select * from [sheet1$] Where 物品名称 in(' 车衣 ',' 扶手箱')" |
9、借用函数优化:
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1 | '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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1 | '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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1 | '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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1 | '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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1 | '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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1 | '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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12 | '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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1 | '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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1 | '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!
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