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  • MySQL doesn't use index in join query

    - by Kocsonya Laci
    I have two tables: comments(id(primary key), author, ip(index)) and visitors(id(primary key), date_time, ip(index)) I want to join them like that: SELECT visitors.date_time FROM comments LEFT JOIN visitors ON ( comments.ip = visitors.ip ) WHERE comments.author = 'author' LIMIT 10 It works, but very slow.. In EXPLAIN it shows that it doesn't use the index on the visitors table: id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE comments ref author author 78 const 9660 Using where 1 SIMPLE visitors ALL NULL NULL NULL NULL 8033 Any ideas? Thanks!

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  • How to get the exact string within the brackets in mysql

    - by sreenath
    In my mysql table a field values are as follows: table name - "clients" field name - "accent" values are - "Eastern(Northern,Southern),Scottish(East Coast)" "Eastern(South,North,Southern),Scottish(East Coast)" If I give select accent from clients where accent like '%north%' if more than 100 records not in the same order. Strings with in the brackets are not in the same order means. It will give above two values. How should i get only second value? Please help me, thanks.

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  • get data from online once and then viewable offline

    - by user313100
    Okay, I want to have an app that takes phone numbers from an online database and displays them in a table view. When the user is not online, I want them to still be able to see the numbers they already got from the database in the table view. If the user manages to go back online, the database updates the view. My question is, is this possible to do and if so, what's the best way to approach it? (bit of a newbie, please help me out)

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  • Syntax Error in showing Error Description

    - by Sreejesh Kumar
    What is the correct Syntax to be applied for "@[System::ErrorDescription]" inside the query like "INSERT" ? I am unable to retrieve the correct Error Description inside the table, as the result in the table is showing as "@[System::ErrorDescription]". I am not getting the result !

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  • Incorrect syntax near the keyword 'select' while execuing query

    - by sam
    I am getting Incorrect syntax near the keyword 'select' after executing the following code. declare @c int SELECT @c = COUNT(*) FROM (select id, max(date_stored) from table B INNER JOIN table P ON B.id = P.id where id = 3) select @c I want to select total no of records having max stored dates in database. Can any one plz tell what I am doing wrong

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  • inner join in sql

    - by vini
    SELECT TotalItems.Total_Items ,TotalItems.No_Items_Present ,ItemsTable.No_Of_Items_Ret FROM TotalItems INNER JOIN ItemsTable ON ItemsTable.Item_Name= '" + DropItemName.SelectedValue + "'" this is my SQL query what I want is to retrieve two column values corresponding to the item I enter in my dropdown list from one table and the no_of_items_ret from another table satisfying the condition of the dropdownlist I'm getting all the values corresponding to any item I enter what should i do?

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  • UITableView manual scrolling to the last row

    - by Dave
    I have a table view controller which doesn't let me manually scroll to the last row. It automatically scrolls slightly up so I could never select the last 2-3 rows. Anyone experienced this problem? Should I set a minimum height for the table view to solve this? If so how?

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  • javascript multidimensional array?

    - by megapool020
    Hi there, I hope I can make myself clear in English and in what I want to create. I first start with what I want. I want to make a IBANcalculator that can generate 1-n IBANnumbers and also validate a given IBANnumber. IBANnumbers are used in many countries for payment and the tool I want to make can be used to generate the numbers for testing purpose. On wikipedia (Dutch site) I found a list with countries and their way of defining the IBANnumber. What I want to do it to make a kind of an array that holds all the countries with their name, the code, there IBANlength, the bankingformat and the account format. The array needs to be used to: Generate a select list (for selecting a country) used to check part for generating numbers used to check part for validating number I don't know if an array is the best way, but that's so far the most knowledge I have. I allready made a table like this that holds the info (this table isn't used anyware, but it was a good way for me to show you what I have in mind about how the structure is): <table> <tr> <td>countryname</td> <td>country code</td> <td>valid IBAN length</td> <td>Bank/Branch Code (check1, bank, branch)</td> <td>Account Number (check2, number, check3)</td> <tr> <tr> <td>Andorra</td> <td>AD</td> <td>24</td> <td>0 4n 4n</td> <td>0 12 0 </td> <tr> <tr> <td>België</td> <td>BE</td> <td>16</td> <td>0 3n 0 </td> <td>0 7n 2n</td> <tr> <tr> <td>Bosnië-Herzegovina</td> <td>BA</td> <td>20</td> <td>0 3n 3n</td> <td>0 8n 2n</td> <tr> </table> and many more ;-) I hope someone can help me with this. Tnx in advance

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  • SQL Server and Identity column

    - by andrew007
    Hi, I just noticed that if I have an identity column in a table, when I insert new rows SQL Server 2008 is automatically filling up the sequence if there are discontinuity. I mean, if in my identity column I have 1,2,5,6 if I insert other two rows in the table the system puts automatically 3,7 in the identity column. Do you know how to control this behavior? THANKS

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  • google app engine

    - by user309944
    I have deployed one application in google app engine. In that application i have created three table. Now i need to add one new table to the existing application. is it possible can any one help me. thanks in advance.

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  • google app engine

    - by user309944
    I have deployed one application in google app engine. In that application i have created three table using java in eclipse. Now i need to add one new table to the existing application. is it possible can any one help me. thanks in advance.

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  • hibernate annotation- extending base class - values are not being set - strange error

    - by gt_ebuddy
    I was following Hibernate: Use a Base Class to Map Common Fields and openjpa inheritance tutorial to put common columns like ID, lastModifiedDate etc in base table. My annotated mappings are as follow : BaseTable : @MappedSuperclass public abstract class BaseTable { @Id @GeneratedValue @Column(name = "id") private int id; @Column(name = "lastmodifieddate") private Date lastModifiedDate; ... Person table - @Entity @Table(name = "Person ") public class Person extends BaseTable implements Serializable{ ... Create statement generated : create table Person (id integer not null auto_increment, lastmodifieddate datetime, name varchar(255), primary key (id)) ; After I save a Person object to db, Person p = new Person(); p.setName("Test"); p.setLastModifiedDate(new Date()); .. getSession().save(p); I am setting the date field but, it is saving the record with generated ID and LastModifiedDate = null, and Name="Test". Insert Statement : insert into Person (lastmodifieddate, name) values (?, ?) binding parameter [1] as [TIMESTAMP] - <null> binding parameter [2] as [VARCHAR] - Test Read by ID query : When I do hibernate query (get By ID) as below, It reads person by given ID. Criteria c = getSession().createCriteria(Person.class); c.add(Restrictions.eq("id", id)); Person person= c.list().get(0); //person has generated ID, LastModifiedDate is null select query select person0_.id as id8_, person0_.lastmodifieddate as lastmodi8_, person0_.name as person8_ from Person person0_ - Found [1] as column [id8_] - Found [null] as column [lastmodi8_] - Found [Test] as column [person8_] ReadAll query : //read all Query query = getSession().createQuery("from " + Person.class.getName()); List allPersons=query.list(); Corresponding SQL for read all select query select person0_.id as id8_, person0_.lastmodifieddate as lastmodi8_, person0_.name as person8_ from Person person0_ - Found [1] as column [id8_] - Found [null] as column [lastmodi8_] - Found [Test] as column [person8_] - Found [2] as column [id8_] - Found [null] as column [lastmodi8_] - Found [Test2] as column [person8_] But when I print out the list in console, its being more weird. it is selecting List of Person object with ID fields = all 0 (why all 0 ?) LastModifiedDate = null Name fields have valid values I don't know whats wrong here. Could you please look at it? FYI, My Hibernate-core version : 4.1.2, MySQL Connector version : 5.1.9 . In summary, There are two issues here Why I am getting All ID Fields =0 when using read all? Why the LastModifiedDate is not being inserted?

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  • SQL datetime LIKE select - why do I need an extra %?

    - by tomsullivan1989
    Can someone explain to me why when I perform a LIKE select in SQL (T-SQL) on a varchar column I can do the following: SELECT * FROM Table WHERE Name LIKE 'Th%' to get names beginning with Th, but when I do the same on a datetime column I need a % before the year, like: SELECT * FROM Table WHERE Date LIKE '%2013%' to get dates in 2013. The datetimes are stored in yyyy-MM-dd hh:mm:ss format. I know I could use a DATEPART style query but I was just interested in why I need the extra % here.

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  • How to make item view render rich (html) text in PyQt?

    - by Giorgio Gelardi
    I'm trying to translate code from this thread in python: import sys from PyQt4.QtCore import * from PyQt4.QtGui import * __data__ = [ "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.", "Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.", "Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.", "Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum." ] def get_html_box(text): return '''<table border="0" width="100%"><tr width="100%" valign="top"> <td width="1%"><img src="softwarecenter.png"/></td> <td><table border="0" width="100%" height="100%"> <tr><td><b><a href="http://www.google.com">titolo</a></b></td></tr> <tr><td>{0}</td></tr><tr><td align="right">88/88/8888, 88:88</td></tr> </table></td></tr></table>'''.format(text) class HTMLDelegate(QStyledItemDelegate): def paint(self, painter, option, index): model = index.model() record = model.listdata[index.row()] doc = QTextDocument(self) doc.setHtml(get_html_box(record)) doc.setTextWidth(option.rect.width()) painter.save() ctx = QAbstractTextDocumentLayout.PaintContext() ctx.clip = QRectF(0, option.rect.top(), option.rect.width(), option.rect.height()) dl = doc.documentLayout() dl.draw(painter, ctx) painter.restore() def sizeHint(self, option, index): model = index.model() record = model.listdata[index.row()] doc = QTextDocument(self) doc.setHtml(get_html_box(record)) doc.setTextWidth(option.rect.width()) return QSize(doc.idealWidth(), doc.size().height()) class MyListModel(QAbstractListModel): def __init__(self, parent=None, *args): super(MyListModel, self).__init__(parent, *args) self.listdata = __data__ def rowCount(self, parent=QModelIndex()): return len(self.listdata) def data(self, index, role=Qt.DisplayRole): return index.isValid() and QVariant(self.listdata[index.row()]) or QVariant() class MyWindow(QWidget): def __init__(self, *args): super(MyWindow, self).__init__(*args) # listview self.lv = QListView() self.lv.setModel(MyListModel(self)) self.lv.setItemDelegate(HTMLDelegate(self)) self.lv.setResizeMode(QListView.Adjust) # layout layout = QVBoxLayout() layout.addWidget(self.lv) self.setLayout(layout) if __name__ == "__main__": app = QApplication(sys.argv) w = MyWindow() w.show() sys.exit(app.exec_()) Element's size and position are not calculated correctly I guess, perhaps because I haven't understand at all the style related parts from original code. Can someone help me?

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  • Is there a prefered way to specify a text column in SQLite?

    - by JannieT
    Since the SQLite engine will not truncate the data you store in a text column, is there any advantage in being specific with column sizes when you define your schema? Would anyone prefer this: CREATE TABLE contact( id INTEGER PRIMARY KEY, name VARCHAR(45), title VARCHAR(10) ); over this: CREATE TABLE contact( id INTEGER PRIMARY KEY, name TEXT, title TEXT ); Why? Are there advantages to not being specific?

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  • show tweets inside div from an asynchronous loop

    - by ak_47
    Am trying to laod tweets into a div after looping them from yahoo placemaker. They are loading on the div but the information shown by them is placemaker's last result. This is the code.. function getLocation(user, date, profile_img, text,url) { var templates = []; templates[0] = '<div><div></div><h2 class="firstHeading">'+user+'</h2><div>'+text+'</div><div><p><a href="' + url + '"target="_blank">'+url+'</a></p></div><p>Date Posted- '+date+'</p></div>'; templates[1] = '<table width="320" border="0"><tr><td class="user" colspan="2" rowspan="1">'+user+'</td></tr><tr><td width="45"><a href="'+profile_img+'"><img src="'+profile_img+'" width="55" height="50"/></a></td><td width="186">'+text+'<p><a href="' + url + '"target="_blank">'+url+'</a></p></td></tr></table><hr>'; templates[2] = '<div><div></div><h2 class="firstHeading">'+user+'</h2><div>'+text+'</div><div><p><a href="' + url + '"target="_blank">'+url+'</a></p></div><p>Date Posted- '+date+'</p></div>'; templates[3] = '<table width="320" border="0"><tr><td class="user" colspan="2" rowspan="1">'+user+'</td></tr><tr><td width="45"><a href="'+profile_img+'"><img src="'+profile_img+'" width="55" height="50"/></a></td><td width="186">'+text+'<p><a href="' + url + '"target="_blank">'+url+'</a></p></td></tr></table><hr>'; var geocoder = new google.maps.Geocoder(); Placemaker.getPlaces(text, function (o) { console.log(o); if (!$.isArray(o.match)) { var latitude = o.match.place.centroid.latitude; var longitude = o.match.place.centroid.longitude; var myLatLng = new google.maps.LatLng(latitude, longitude); var marker = new google.maps.Marker({ icon: profile_img, title: user, map: map, position: myLatLng }); var infowindow = new google.maps.InfoWindow({ content: templates[0].replace('user',user).replace('text',text).replace('url',url).replace('date',date) }); var $tweet = $(templates[1].replace('%user',user).replace(/%profile_img/g,profile_img).replace('%text',text).replace('%url',url)); $('#user-banner').css("visibility","visible");$('#news-banner').css("visibility","visible"); $('#news-tweets').css("overflow","scroll").append($tweet); function openInfoWindow() { infowindow.open(map, marker); } google.maps.event.addListener(marker, 'click', openInfoWindow); $tweet.find(".user").on('click', openInfoWindow); bounds.extend(myLatLng); } }); }

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