Sqlite Delete Duplicates by value

2 posts in this topic

#1 ·  Posted (edited)

I have a table with 9 columns and at some point I add an incomplete entry, it might have 2 columns filled in, it might have all of them. When I come back to the table to extract the items I check to see if there are duplicates, pulling out the row with all the information I need but now I need to delete all those duplicates.

Here's a small reproducer for what I'm trying to accomplish. I thought it would be easy with LIMIT but that gives a syntax error.

#include <SQLite.au3>
#include <SQLite.dll.au3>
#include <Array.au3>

Global $hSqDb = _SQLite_Open("")
Global $iRows = 0
Global $iColumns = 0
Global $aResults = Null
Global $iHighestRating = 0
Global $iLowestRating = 0

_SQLite_Exec($hSqDb, "CREATE TABLE IF NOT EXISTS websites (url TEXT, lastVisit TEXT, nextVisit TEXT, rating INTEGER);")
_SQLite_Exec($hSqDb, "INSERT INTO websites VALUES ('', '4/10/2016.0012', '4/10/2016.1212', 8), ('', Null, Null, Null), ('', '4/09/2016.0936', '4/10/2016.0936', 7), ('', '4/05/2016.2200', '4/15/2016.4000', 4);")

$aResults = _SqLite_GetAllRows($hSqDb, "websites", "url", '')

For $i = 1 to UBound($aResults) - 1
    $iHighestRating = Max($iHighestRating, $aResults[$i][3])
    $iLowestRating = Min($iLowestRating, $aResults[$i][3])

; Limit gives syntax error
_SQLite_Exec($hSqDb, "DELETE FROM websites WHERE url = '' LIMIT " & UBound($aResults) - 2 & ";")


Func Min(Const $lhs, Const $rhs)
    Return ($lhs < $rhs ? $lhs : $rhs)

Func Max(Const $lhs, Const $rhs)
    Return ($lhs > $rhs ? $lhs : $rhs)

Func _SqLite_GetAllRows(ByRef $hSqLite, Const $sTable, Const $sWhereKey, $sWhereValue)
    Local $iRows = 0
    Local $iColumns = 0
    Local $aReturn = Null
    Local $iGetAttempts = 100
    If ($sWhereValue <> "" and Not (StringIsInt($sWhereValue) or StringIsFloat($sWhereValue))) Then $sWhereValue = "'" & $sWhereValue & "'"
        _SQLite_GetTable2d($hSqLite, "SELECT * FROM " & $sTable & " WHERE " & $sWhereKey & " = " & $sWhereValue & ";", $aReturn, $iRows, $iColumns)
    Until (_SQLite_ErrCode() = $SQLITE_OK Or _SQLite_ErrCode() = $SQLITE_NOTFOUND or $iGetAttempts = 0)
    Return ($iRows > 1 ? SetExtended($iRows, $aReturn) : SetError(-1, 0, ""))

To clarify, I need to delete only the rows with the specified value and not remove the other duplicates.

Edited by InunoTaishou

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And after half an hour of googling and talking to a friend who works with MySql the solution:

_SQLite_Exec($hSqDb, "DELETE FROM websites WHERE rowid IN (SELECT rowid FROM websites WHERE url = '' ORDER BY rating asc LIMIT 3)")

Remove all the google urls except one and sort it by the rating, making it remove the null items first (or lowest number first, my example just had null)

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Default drawing of item $iItem = DllStructGetData( $tNMLVCUSTOMDRAW, "dwItemSpec" ) Return $CDRF_NOTIFYSUBITEMDRAW ; Stage 3 will be carried out ; Stage 3 Case BitOR( $CDDS_ITEMPREPAINT, $CDDS_SUBITEM ) ; Before a subitem is painted Return $CDRF_NOTIFYPOSTPAINT ; Stage 4 will be carried out ; Stage 4 Case BitOR( $CDDS_ITEMPOSTPAINT, $CDDS_SUBITEM ) ; After a subitem has been painted If DllStructGetData( $tNMLVCustomDraw, "iSubItem" ) = $iSubItem Then Local $hDC = DllStructGetData( $tNMLVCUSTOMDRAW, "hdc" ) ; Device context $aRect = _GUICtrlListView_GetSubItemRect( $hListView, $iItem, $iSubItem ) ; Subitem rectangle $aRect[2] = $aRect[0] + _GUICtrlListView_GetColumnWidth( $hListView, $iSubItem ) DllStructSetData( $tRect, "Left", $aRect[0]+4 ) DllStructSetData( $tRect, "Top", $aRect[1] ) DllStructSetData( $tRect, "Right", $aRect[2] ) DllStructSetData( $tRect, "Bottom", $aRect[3] ) _WinAPI_FillRect( $hDC, $tRect, $hBrush ) ; Fill subitem background _WinAPI_SetTextColor( $hDC, 0x000000 ) ; Set black text color DllStructSetData( $tRect, "Left", DllStructGetData( $tRect, "Left" ) + 2 ) ; Adjust rectangle If $bNotXP Then DllStructSetData( $tRect, "Top", DllStructGetData( $tRect, "Top" ) + 2 ) _WinAPI_DrawText( $hDC, StringSplit($RowsArray[$iItem+2],$TabSep)[$iSubItem+1], $tRect, $DT_WORD_ELLIPSIS ) ; Draw text EndIf Return $CDRF_NEWFONT ; $CDRF_NEWFONT must be returned after changing font or colors EndSwitch Case $NM_CLICK If Not $bComboDoNotOpen And Not $bComboOpenOnDoubleClick And $iItem > -1 And $iSubItem > -1 Then _ GUICtrlSendToDummy( $idComboOpen ) ; Send message to open ComboBox Case $NM_DBLCLK If $bComboOpenOnDoubleClick And $iItem > -1 And $iSubItem > -1 Then _ GUICtrlSendToDummy( $idComboOpen ) ; Send message to open ComboBox EndSwitch EndSwitch Return $GUI_RUNDEFMSG EndFunc ; Handle ListView messages related to ComboBox Func ListViewCallback( $hWnd, $iMsg, $wParam, $lParam, $iSubclassId, $pData ) Switch $iMsg ; Open ComboBox on Enter key Case $WM_GETDLGCODE Switch $wParam Case $VK_RETURN If Not $bComboDoNotOpen And $bComboOpenOnEnter And $iItem > -1 And $iSubItem > -1 Then _GUICtrlListView_SetItemSelected( $hListView, -1, False ) _GUICtrlListView_SetItemSelected( $hListView, $iItem ) GUICtrlSendToDummy( $idComboOpen ) EndIf EndSwitch ; Manage multiple selections ; Prevent ComboBox from opening ; Manage keyboard events Case $WM_KEYDOWN Switch $wParam Case $VK_SHIFT, $VK_CONTROL $bComboDoNotOpen = True ; Manage keyboard events Case $VK_LEFT If Not $bComboDoNotOpen And $iSubItem > 0 Then $iSubItem -= 1 _GUICtrlListView_RedrawItems( $hListView, $iItem, $iItem ) Case $VK_RIGHT If Not $bComboDoNotOpen And $iSubItem < _GUICtrlListView_GetColumnCount( $hListView ) - 1 Then $iSubItem += 1 _GUICtrlListView_RedrawItems( $hListView, $iItem, $iItem ) Case $VK_SPACE If Not $bComboDoNotOpen And $bComboOpenOnSpace And $iItem > -1 And $iSubItem > -1 Then _GUICtrlListView_SetItemSelected( $hListView, -1, False ) GUICtrlSendToDummy( $idComboOpen ) EndIf EndSwitch Case $WM_KEYUP Switch $wParam Case $VK_SHIFT, $VK_CONTROL $bComboDoNotOpen = False EndSwitch ; Left click in ListView ; Sent on single and double click ; Determines item/subitem of the cell that's clicked Case $WM_LBUTTONDOWN Local $aHit = _GUICtrlListView_SubItemHitTest( $hListView ) If $bComboOpen Then ; If another ComboBox is open then delete it _GUICtrlEDIT_Destroy( $hEdit ) GUICtrlSendToDummy( $idComboClose ) _WinAPI_SetFocus( $hListView ) EndIf If $aHit[0] > -1 And $aHit[1] > -1 Then $iItem = $aHit[0] $iSubItem = $aHit[1] _GUICtrlListView_RedrawItems( $hListView, $iItem, $iItem ) EndIf ; Delete ComboBox on right click in ListView and on left ; or right click in non-client ListView area (Scrollbars). Case $WM_RBUTTONDOWN, $WM_NCLBUTTONDOWN, $WM_NCRBUTTONDOWN _GUICtrlEDIT_Destroy( $hEdit ) GUICtrlSendToDummy( $idComboClose ) _WinAPI_SetFocus( $hListView ) EndSwitch ; Call next function in subclass chain Return DllCall( "comctl32.dll", "lresult", "DefSubclassProc", "hwnd", $hWnd, "uint", $iMsg, "wparam", $wParam, "lparam", $lParam )[0] #forceref $iSubclassId, $pData EndFunc ; Messages from the Edit control of the ComboBox Func EditCallback( $hWnd, $iMsg, $wParam, $lParam, $iSubclassId, $pData ) Switch $iMsg ; Dialog codes Case $WM_GETDLGCODE Switch $wParam Case $VK_TAB ; Close GUICtrlSendToDummy( $idComboClose, True ) Case $VK_RETURN ; Accept and close GUICtrlSendToDummy( $idComboClose, True ) Case $VK_ESCAPE ; Close GUICtrlSendToDummy( $idComboClose, True ) _WinAPI_SetFocus( $hListView ) $bEditEscape = True EndSwitch ; Double click in Edit part of ComboBox Case $WM_LBUTTONDBLCLK Local $aPos = MouseGetWindowPos( $hListView ) If $aPos[0] > $aRect[0] And $aPos[0] < $aRect[2] And $aPos[1] > $aRect[1] And $aPos[1] < $aRect[1] + 20 Then _ GUICtrlSendToDummy( $idComboClose, True ) ; Accept and close EndSwitch ; Call next function in subclass chain Return DllCall( "comctl32.dll", "lresult", "DefSubclassProc", "hwnd", $hWnd, "uint", $iMsg, "wparam", $wParam, "lparam", $lParam )[0] #forceref $iSubclassId, $pData EndFunc ; Handle GUI messages related to ComboBox control Func GuiCallback( $hWnd, $iMsg, $wParam, $lParam, $iSubclassId, $pData ) Switch $iMsg ; Delete ComboBox on left or right mouse click in non-client GUI area and on GUI deactivate Case $WM_NCLBUTTONDOWN, $WM_NCRBUTTONDOWN, $WM_ACTIVATE _GUICtrlEDIT_Destroy( $hEdit ) GUICtrlSendToDummy( $idComboClose ) EndSwitch ; Call next function in subclass chain Return DllCall( "comctl32.dll", "lresult", "DefSubclassProc", "hwnd", $hWnd, "uint", $iMsg, "wparam", $wParam, "lparam", $lParam )[0] #forceref $iSubclassId, $pData EndFunc ; Get mouse pos relative to window Func MouseGetWindowPos( $hWindow ) Local $aPos = MouseGetPos() Local $tPoint = DllStructCreate( "int X;int Y" ) DllStructSetData( $tPoint, "X", $aPos[0] ) DllStructSetData( $tPoint, "Y", $aPos[1] ) _WinAPI_ScreenToClient( $hWindow, $tPoint ) $aPos[0] = DllStructGetData( $tPoint, "X" ) $aPos[1] = DllStructGetData( $tPoint, "Y" ) Return $aPos EndFunc