This should be a fairly simple one. I am creating a dataset which will contain a description field which I would like to sort by. The reason I want to sort the开发者_如何学Python dataadapter and not in my SQL is that I am already ordering by the results that have a particular value.
My SQL looks like this:
SELECT pif_desc, pif_fund, psf_end, (CASE WHEN SUM(pmi_units) IS Null THEN 0 ELSE SUM(pmi_units) END) As fundunits
FROM tbl_mem INNER JOIN tbl_sfunds
ON pm_scheme = psf_scheme
INNER JOIN tbl_invfun
ON tbl_fund = tbl_fund
LEFT JOIN pe_minv
ON pmi_fund = pif_fund AND pm_member = pmi_member
WHERE pm_member = @pm_member
GROUP BY pif_desc, pif_fund, psf_end
ORDER BY fundunits DESC
My VB looks like this:
Dim cmd As New SqlCommand("getMembersFundsDCGENST", conn)
cmd.CommandType = CommandType.StoredProcedure
Dim p_pm_member As New SqlParameter("@pm_member", SqlDbType.Int)
p_pm_member.Value = pm_member
cmd.Parameters.Add(p_pm_member)
Dim p_period_closing_date As New SqlParameter("@closingdate", SqlDbType.DateTime)
p_period_closing_date.Value = period_closing_date
cmd.Parameters.Add(p_closing_date)
Dim da As New SqlDataAdapter(cmd)
da.Fill(ds)
I want to sort the datarows is ds.tables(0) by pif_desc but still have the rows with fundunits > 0 listed first.
I am also open to other suggestions on how I can achieve the correct ordering.
Is the output you're looking for more like this?
pif_desc fundunits
ABCDEF 6
CBCDEG 2
DEFGHI 4
ADFKHG 0
BFJSKL 0
XDFDKF 0
If so, try this SQL query:
SELECT pif_desc,
pif_fund,
psf_end,
(CASE WHEN fundunits IS Null THEN 0
ELSE fundunits END) As fundunits,
(CASE WHEN fundunits IS Null THEN 0
ELSE 1 END) As pif_order
FROM (
SELECT pif_desc,
pif_fund,
psf_end,
SUM(pmi_units) As fundunits
FROM tbl_mem
INNER JOIN tbl_sfunds
ON pm_scheme = psf_scheme
INNER JOIN tbl_invfun
ON tbl_fund = tbl_fund
LEFT JOIN pe_minv
ON pmi_fund = pif_fund AND pm_member = pmi_member
WHERE pm_member = @pm_member
GROUP BY pif_desc, pif_fund, psf_end
) pifs
ORDER BY pif_order,pif_desc
DataView
should be used whenever sorting or filtering is to be applied in code. Take a look.
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