InunoTaishou

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>

_SQLite_Startup()
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 ('https://www.google.com/', '4/10/2016.0012', '4/10/2016.1212', 8), ('https://www.google.com/', Null, Null, Null), ('https://www.bing.com', '4/09/2016.0936', '4/10/2016.0936', 7), ('https://www.yahoo.com.com', '4/05/2016.2200', '4/15/2016.4000', 4);")

$aResults = _SqLite_GetAllRows($hSqDb, "websites", "url", 'https://www.google.com/')

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

; Limit gives syntax error
_SQLite_Exec($hSqDb, "DELETE FROM websites WHERE url = 'https://www.google.com/' LIMIT " & UBound($aResults) - 2 & ";")

_SQLite_Close($hSqDb)
_SQLite_Shutdown()

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

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

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 = "'" & $sWhereValue & "'"
    Do
        _SQLite_GetTable2d($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, ""))
EndFunc

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

Edited by InunoTaishou

Share this post


Link to post
Share on other sites



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 = 'https://www.google.com/' 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)

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now

  • Similar Content

    • Burgs
      By Burgs
      Greetings,
        I have SQLite setup within my AutoIT program...I'm trying to accomplish what should be a relatively simple task.  I want to be able to return an array of 'table' names for an established database...I believe this might be possible using the '_SQLite_SQLiteExe' command...since it seems to be able to access SQLite schemas...?  The ".tables" command is one of them...if I am not mistaken that command returns a list of all table names in the active database.
        I am attempting the following:
      #include <SQLite.au3> #include <SQLite.dll.au3> Global $hDb, $sIn, $sOut ... $sIn = ".tables" & @CRLF _SQLite_SQLiteExe($hDb, $sIn, $sOut) if @error == 0 Then ;Show Table (using SQLite3.dll) Else if @error == 2 Then ConsoleWrite("ERROR: Sqlite3.exe file not found" & @CRLF) Else ConsoleWrite("ERROR: @error=" & @error & " when calling _SQLite_SQLiteExe" & @CRLF) EndIf ;@error is "2"...OR NOT... EndIf ;@error is "0"...OR NOT... ...   The error being thrown is "ERROR: Sqlite3.exe file not found" ...
        Am I required to have the Sqlite3.exe installed in my directory (i.e. @ScriptsDir)...???  I do not have it in there at present because I did not believe it was necessary with the 'include' calls to "SQLite.au3" and "SQLite.dll.au3"...any advice appreciated.  Thanks in advance. 
      Regards
       
       
       
       
       
       
       
    • FrancescoDiMuro
      By FrancescoDiMuro
      Good evening guys
      I am working on a little project, in which I have to retrieve 8000+ rows of data from a table, from a SQLite database, to populate a combobox 
      This is what I tried 'til now, but it still takes about 12 seconds to populate the combobox.
      _SQLite_Exec($objDatabase, "BEGIN TRANSACTION;") If _SQLite_GetTable($objDatabase, "SELECT DISTINCT Comune FROM LISTA_COMUNI;", $arrRisultatoQuery, $intRighe, $intColonne) = $SQLITE_OK Then For $i = 2 To UBound($arrRisultatoQuery) - 1 If $i < UBound($arrRisultatoQuery) - 1 Then GUICtrlSetData($cbo_ComuneNascita, $arrRisultatoQuery[$i] & "|") Else GUICtrlSetData($cbo_ComuneNascita, $arrRisultatoQuery[$i]) EndIf Next _SQLite_Exec($objDatabase, "COMMIT;") Are there any other solution to retrieve 8000+ records from a SQLite database?
      Thank you very much  
    • FrancescoDiMuro
      By FrancescoDiMuro
      Good morning community!
      I am working on a script which read from a text file ( .txt ) and should import all the content in a SQLite3 DB, in order to execute some queries that should be difficult to execute on a text file.
      So, I was looking for something very very fast, because the file could be very large ( I don't know exaclty how much can became big, but I know a lot of rows, it's a log file ... )
      I found the "Import method", but I don't know If I can implement it in a query ( @jchd, it's your turn!  )
      Do you know some methods that I can implement in my script to have a very very fast import of thousands and thousands rows in a SQLite3 DB?
      Thanks a lot
      Francesco
    • FrancescoDiMuro
      By FrancescoDiMuro
      Good morning guys
      I was trying to use again SQLite in AutoIt, and I've again an issue: I can't startup SQLite...
      Can you please show me the way to set the enviornment for a SQLIte usage in AutoIt? Step by step, I'll follow your suggestion(s).

      Thanks for everyone will reply!

      Francesco
    • FrancescoDiMuro
      By FrancescoDiMuro
      Good evening everyone
      I'm working on this little project for a week, and, what I'm trying to do could be useful for many users as well...
      I'm trying to do a "Report Generator", which reads the data that have to report from a text file (.txt) formatted with this pattern;
      Data1;Data2;Data3;Data4;Data5;;

      YES, there are 2 semi-colon at the end of the line.

      In detail, Data1 is a date/time stamp with this format: YYYY/MM/DD HH:MM:SS ;

      When the script starts, the user is prompted to choose 2 dates which I'll call as:
      Report_Date_Start; Report_Date_Start. So, the report, should cover all dates between Report_Date_Start AND Report_Date_End.

      And, already at this point, I don't know how to do the query... How can I say to the script:
      SELECT * FROM (.txt) WHERE Data1 BETWEEN Report_Date_Start AND Report_Date_End; ?

      I thought that I could do a _DateDiff, but if the difference between the two dates is months and not days, how can I do the trick?
      Should I make a Switch...Case with the _DateDiff() and see then calculate all the dates between Report_Date_Start AND Report_Date_End... But then, how can I compare the dates in the file with all the dates between Report_Date_Start AND Report_Date_End? I'm going crazy, I know...

      I've already made a "Export Tool", which exports the content of the .txt file in a .db, managed with SQLite... I mean, there I could easily do a query like I did above the thread, but, this "export", for 1080 rows, takes 28 seconds to be done. And, 1080 rows are daily rows that are added every day in the .txt file, so, in a week, the file could be easily 7000+ rows, which means that the "export" would take 3 minutes to be done... And we can go over and over...
      I'll post just for be "complete" what I've done about the export, so, maybe, someone could say how to improve it in terms of efficency...
       
      Local $aContenutoFileAuditReport = "" _FileReadToArray($sFileAudit_Report, $aContenutoFileAuditReport) If(IsArray($aContenutoFileAuditReport) And Not @error) Then Local $aContenutoFileAuditReport_Splitted = "" Local $sQuery = "" Local $hInizioConteggio = TimerInit() For $i = 1 To UBound($aContenutoFileAuditReport) - 1 $aContenutoFileAuditReport_Splitted = StringSplit($aContenutoFileAuditReport[$i], ";") $sQuery = "INSERT INTO FileDB_Report(DATESTAMP, TIMESTAMP, USER_ID, OBJECT_ID, DESCRIPTION, COMMENT) " & _ "VALUES(" & _ _SQLite_FastEscape($aContenutoFileAuditReport_Splitted[0]) & "," & _ _SQLite_FastEscape($aContenutoFileAuditReport_Splitted[1]) & "," & _ _SQLite_FastEscape($aContenutoFileAuditReport_Splitted[3]) & "," & _ _SQLite_FastEscape($aContenutoFileAuditReport_Splitted[4]) & "," & _ _SQLite_FastEscape($aContenutoFileAuditReport_Splitted[5]) & "," & _ _SQLite_FastEscape($aContenutoFileAuditReport_Splitted[6]) & ");" If(_SQLite_Exec($hFileDB_Report, $sQuery) <> $SQLITE_OK) Then ConsoleWrite("Errore durante l'esecuzione della query #" & $i & @CRLF) Else ConsoleWrite("Query eseguita correttamente #" & $i & @CRLF) EndIf Next ConsoleWrite("Esportazione completata in: " & Round(TimerDiff($hInizioConteggio)/1000, 0) & " secondi") Else MsgBox($MB_ICONERROR, "Errore!", "Errore durante la lettura del file nell'array." & @CRLF & "Errore: " & @error) EndIf I know that I can't do queries from a .txt file...
      [19:18] 
      I've been writing this post from 18:40 maybe...
      By the way, if @jchd or someone else could tell me if I can import a formatted .txt file in SQLite and then, do queries on the DB, I'd be very happy for that...
      About the report in PDF, I'm talking with @taietel in order to know how to create a PDF.
      I hope someone will help me
      Sorry for the "long" list of questions...
      Thank you for everything you've done for me
      I have to say that this is the community of programming language that I've loved most!
      By the way, I'll be back tomorrow in the morning ( ~ 9:15 a.m. Italian time ), so, excuse me if I can't answer before that time.
      Hope you guys have a wonderful day/night.

      Thanks again

      Francesco