以文本方式查看主题 - Foxtable(狐表) (http://foxtable.com/bbs/index.asp) -- 专家坐堂 (http://foxtable.com/bbs/list.asp?boardid=2) ---- MYSQL用帮助SQL出错 (http://foxtable.com/bbs/dispbbs.asp?boardid=2&id=189018) |
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-- 作者:lin98 -- 发布时间:2023/11/6 10:53:00 -- MYSQL用帮助SQL出错 帮助: \'Dim cmd As New SQ-LCommand \'cmd.C \'Dim dt As DataTable \'Dim Cols1() As String = {"来源列一", "来源列二", "来源列三"} \'Dim Cols2() As String = {"接收列一", "接收列二", "接收列三"} \'cmd.CommandText = "SELEC-T * From {表A} Where 条件语句" \'dt = cmd.ExecuteReader() \'For Each dr1 As DataRow In dt.DataRows \' Dim dr2 As DataRow = DataTables("表B").AddNew() \' For i As Integer = 0 To Cols1.Length - 1 \' dr2(Cols2(i)) = dr1(Cols1(i)) \' Next \'Next MYSQ-L \'Dim db = HySq-l.DataBaseFactory.CreateDatabase("my") \'Dim Sql = "Selec-t 产品编号, max(日期) as 日期 From {kcxb_tb} group by 产品编号" \'Dim Cols1() As String = {"来源列一", "来源列二", "来源列三"} \'Dim Cols2() As String = {"来源列一", "来源列二", "来源列三"} \'Dim dt As system.data.DataTable = db.ExecuteDataSet(Sq-l).Tables(0) \'dt.TableName = "kcb_tb" \'For Each dr1 As DataRow In dt.Rows \' Dim dr2 As DataRow = DataTables("登记窗口_Table1").AddNew() \' For i As Integer = 0 To Cols1.Length - 1 \' dr2(Cols2(i)) = dr1(Cols1(i)) \' Next \'Next 报错提: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near \'} group by 产品编号\' at line 1 |
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-- 作者:有点蓝 -- 发布时间:2023/11/6 10:54:00 -- 使用外部数据源最好都去掉表名的大括号 |
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-- 作者:lin98 -- 发布时间:2023/11/6 12:34:00 -- \'Dim db = HySq-l.DataBaseFactory.CreateDatabase("my") \'Dim Sql = "Selec-t 产品编号, max(日期) as 日期 From kcxb_tb group by 产品编号" \'Dim Cols1() As String = {"来源列一", "来源列二", "来源列三"} \'Dim Cols2() As String = {"来源列一", "来源列二", "来源列三"} \'Dim dt As system.data.DataTable = db.ExecuteDataSet(Sq-l).Tables(0) \'dt.TableName = "kcb_tb" \'For Each dr1 As DataRow In dt.Rows \' Dim dr2 As DataRow = DataTables("登记窗口_Table1").AddNew() \' For i As Integer = 0 To Cols1.Length - 1 \' dr2(Cols2(i)) = dr1(Cols1(i)) \' Next \'Next 报错: 无法将类型为“System.Data.DataRow”的对象强制转换为类型“Foxtable.DataRow”。 |
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-- 作者:有点蓝 -- 发布时间:2023/11/6 13:39:00 -- For Each dr1 As System.Data.DataRow In dt.Rows |
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-- 作者:lin98 -- 发布时间:2023/11/6 16:12:00 -- \'Dim f As New Filler \'f.SourceTable = DataTables("登记窗口_Table2") \' \'f.SourceCols = "产品编号" ,"存量"\' \'f.DataTable = DataTables("登记窗口_Table1") \' \'f.DataCols = "产品编号","数量" \' \'f.Fill() \' \'Dim Sql = "Selec-t 产品编号, max(日期) as 日期 From kcxb_tb group by 产品编号" 上面代码,如何实现从Table2按不重复产品编号其最后一条的值(数量),写入Table1里?
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-- 作者:有点蓝 -- 发布时间:2023/11/6 16:24:00 -- Filler做不到。换种方式,使用getvalues去获取不重复的编号,然后遍历不重复的编号查询日期最大的记录 |
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-- 作者:lin98 -- 发布时间:2023/11/10 9:24:00 --
执行报错: 列“统计_数量”不属于表 xb_tb。资料:MYSQL 主表的字段:日期,产品,数量 明细表的字段:日期,产品,统计_数量 需求:实现主表取明细表不重复,最后记录的数据或最后日期的数据,如何实现? |
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-- 作者:有点蓝 -- 发布时间:2023/11/10 9:54:00 -- 提示很明显了,列名不正确 |
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-- 作者:lin98 -- 发布时间:2023/11/10 10:07:00 -- 排查字段,没有问题,放弃上面方法 实现下面需求,MYSQ-L,有其他代码? 需求:实现主表取明细表不重复,最后记录的数据或最后日期的数据,如何实现?注:明细表的数据量比较大,
[此贴子已经被作者于2023/11/10 10:08:31编辑过]
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-- 作者:有点蓝 -- 发布时间:2023/11/10 10:15:00 -- SqlServer可以这样 Select a.* From kcxb_tb as a inner join (Select 产品编号, max(日期) as 日期 From kcxb_tb group by 产品编号) as b on a. 产品编号=b. 产品编号 and a.日期=b.日期 至于mysql的语法我也没用过,就不清楚了,自己上网搜搜
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