求应付款总账，如图，怎么建查询表，得到应付款总账表？

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点击浏览该文件:应付款总账.foxdb

Dim sd As Date = "2017-03-01"
Dim ed As Date = "2017-03-31"

Dim filter1 As String = "发生日期 < #" & sd & "#"
Dim filter2 As String = "发生日期 >= #" & sd & "# and 发生日期 <= #" & ed & "#"
Dim sql As String = "Select a.往来单位编号, 期初应付, 本期增加应付, 本期减少应付, 期初应付+本期增加应付-本期减少应付 As 期末结存 from (Select 往来单位编号, (iif(sum(应付金额) is null,0,sum(应付金额)) - iif(sum(已付金额) is null,0,sum(已付金额))) As 期初应付 from {应付单} where " & filter1 & " group by 往来单位编号) As a left join (Select 往来单位编号, iif(sum(应付金额) is null, 0, sum(应付金额)) As 本期增加应付, iif(sum(已付金额) is null, 0, sum(应付金额)) As 本期减少应付 from {应付单} where " & filter2 & " group by 往来单位编号) As b on a.往来单位编号=b.往来单位编号"

Dim q As new QueryBuilder
q.TableName = "查询"
q.SelectString = sql
q.Build
MainTable = Tables("查询")

Dim sd As Date = "2017-03-01"
Dim ed As Date = "2017-03-31"

Dim filter1 As String = "发生日期 < #" & sd & "#"
Dim filter2 As String = "发生日期 >= #" & sd & "# and 发生日期 <= #" & ed & "#"
Dim sql As String = "select c.往来单位编号, 期初应付, 本期增加应付, 本期减少应付, 期初应付+本期增加应付-本期减少应付 As 期末结存 from (select a.往来单位编号, 期初应付 from (select 往来单位编号 from {应付单} group by 往来单位编号) as a left join (Select 往来单位编号, (iif(sum(应付金额) is null,0,sum(应付金额)) - iif(sum(已付金额) is null,0,sum(已付金额))) As 期初应付 from {应付单} where " & filter1 & " group by 往来单位编号) As b on a.往来单位编号 = b.往来单位编号) As c left join (Select 往来单位编号, iif(sum(应付金额) Is null, 0, sum(应付金额)) As 本期增加应付, iif(sum(已付金额) Is null, 0, sum(应付金额)) As 本期减少应付 from {应付单} where " & filter2 & " group by 往来单位编号) As d on c.往来单位编号 = d.往来单位编号"
Dim q As new QueryBuilder
q.TableName = "查询"
q.SelectString = sql
q.Build
MainTable = Tables("查询")

怎么加上”往来单位名称“

fill外部表就不行了

测试没问题。你的是什么数据源？

Dim sd As Date = "2017-03-01"
Dim ed As Date = "2017-03-31"

Dim filter1 As String = "发生日期 < #" & sd & "#"
Dim filter2 As String = "发生日期 >= #" & sd & "# and 发生日期 <= #" & ed & "#"
Dim sql As String = "select c.往来单位编号, 期初应付, 本期增加应付, 本期减少应付, 期初应付+本期增加应付-本期减少应付 As 期末结存 from (select a.往来单位编号, 期初应付 from (select 往来单位编号 from {应付单} group by 往来单位编号) as a left join (Select 往来单位编号, (iif(sum(应付金额) is null,0,sum(应付金额)) - iif(sum(已付金额) is null,0,sum(已付金额))) As 期初应付 from {应付单} where " & filter1 & " group by 往来单位编号) As b on a.往来单位编号 = b.往来单位编号) As c left join (Select 往来单位编号, iif(sum(应付金额) Is null, 0, sum(应付金额)) As 本期增加应付, iif(sum(已付金额) Is null, 0, sum(应付金额)) As 本期减少应付 from {应付单} where " & filter2 & " group by 往来单位编号) As d on c.往来单位编号 = d.往来单位编号"

DataTables("表A").Fill(sql, True)

1.怎么加上”往来单位名称“

2.sql数据源，iif判断会出错，去掉iif的话，数据有不正确

sqlserver数据库的话，用isnull函数代替iif函数