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• Google app engine: empty property in datastore

  - by Pete

  Dear All, Let say I have a model: class A(db.Model): B = db.StringProperty() C = db.StringProperty() How do I query if I wanted to search all empty property (not None, just empty) in C using python?

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• [mysql] having a number in

  - by Wiika

  Hi all, ID Name Hidden 1 Mika 1,4,2 2 Loca 0 3 Nosta 4 4 Like 2 can someone give me a query that will return as a result rows ID 1 & 3 something like this SELECT * FROM table WHERE Hidden HAVING(4) Thanks, I Appreciate

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• Drop group of stored procedures by name

  - by Kate

  I have group of stored procedures with names like 'somename_%'. Are there any way to delete that SP with one query, forexample DROP PROCEDURE where name like 'somename_%' .

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• Which of these queries is preferable?

  - by bread

  I've written the same query as a subquery and a self-join. Is there any obvious argument for one over the other here? SUBQUERY: SELECT prod_id, prod_name FROM products WHERE vend_id = (SELECT vend_id FROM products WHERE prod_id = ‘DTNTR’); SELF-JOIN: SELECT p1.prod_id, p1.prod_name FROM products p1, products p2 WHERE p1.vend_id = p2.vend_id AND p2.prod_id = ‘DTNTR’;

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• mysql count rows and grop them by month

  - by user2661296

  I have a table called cc_calls and there I have many call records I want to count them and group them in months I have a timestamp called starttime and I can use that row to extract the month, also limit the count for 12 months the results should be like: Month Count January 768768 February 876786 March 987979 April 765765 May 898797 June 876876 July 786575 August 765765 September 689787 October 765879 November 897989 December 876876 Can anyone guide me or show me the mysql query that I need to get this result.

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• sizeof(class) c++

  - by badkya

  How is it possible for sizeof(class) to return two different values depending on context? The class itself should have the same size right irrespective of where I ask this question? I see a smaller value when querying class size from main() and another when I query class size from an extended class.

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• Best database (mysql) structure for this case:

  - by robert

  we have three types of data (tables): Book (id,name,author...) ( about 3 million of rows) Category (id,name) ( about 2000 rows) Location (id,name) ( about 10000 rows) A Book must have at least 1 type of Category (up to 3) AND a Book must have only one Location. I need to correlate this data to get this query faster: Select Books where Category = 'cat_id' AND Location = 'loc_id' Select Books where match(name) against ('name of book') AND Location = 'loc_id' Please I need some help. Thanks

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• Versant OQL Statement with an Arithmetic operator

  - by Pascal

  I'm working on a c# project that use a Versant Object Database back end and I'm trying to build a query that contains an arithmetic operator. The documentation states that it is supported but lack any example. I'm trying to build something like this: SELECT * FROM _orderItemObject WHERE _qtyOrdered - _qtySent > 0 If I try this statement in the Object Inspector I get a synthax error near the '-'. Anyone has an example of a working VQL with that kind of statement? Thanks

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• php reading mysql bit field returning weird character

  - by user121196

  I am using mysql_fetch_assoc($query), one of the bit field returns out to be , which is supposedly to be true. The problem is that I also need to output this to xml and it's an illegal xml character. the charset for the db table is utf-8. why does this happen?

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• How do I prevent SQL injection with ColdFusion

  - by Daniel A. White

  How do I prevent SQL injection when it comes to ColdFusion? I'm quite new to the language/framework. Here is my example query. <cfquery name="rsRecord" datasource="DataSource"> SELECT * FROM Table WHERE id = #url.id# </cfquery> I see passing in url.id as a risk.

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• What does a leading "\??\" on a windows path mean?

  - by kdt

  When using GetModuleFileNameEx to query the image path of a running process, some processes have an image path that starts with "\??\". For example, while most processes start "C:\WINDOWS", some processes start "\??\C:\WINDOWS". What does the leading \??\ mean on a windows path?

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• MySQL - Calculate the net time difference between two date-times while excluding breaks?

  - by John M

  In a MySQL query I am using the timediff/time_to_sec functions to calculate the total minutes between two date-times. For example: 2010-03-23 10:00:00 - 2010-03-23 08:00:00 = 120 minutes What I would like to do is exclude any breaks that occur during the selected time range. For example: 2010-03-23 10:00:00 - 2010-03-23 08:00:00 - (break 08:55:00 to 09:10:00) = 105 minutes Is there a good method to do this without resorting to a long list of nested IF statements?

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• SQL SERVER 2000 is Slow & linked server send an error "Server dosen't exisit or Access is denied"

  - by amin

  Dears , I have a prolblem in my SQL SERVER 2000 , the server is so slow when i made any query and recently i couldn't link with other sql servers the message is "the server dosen't exists or access id denied" in spite of that the linked servers were working well and i can access them remotly & the service pack is SP4... any body can help .. thanks again.

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• getschema("foreignkeys") against SqlClient doesn't yield enough information

  - by csells

  I need two tables and two sets of fields, not the name of the foreign key and one of the table names. Does anyone know how to query SQL Server for complete foreign key information? Thanks!

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• Why doesn't SQL LIKE work in Microsoft Access?

  - by poo

  I want to my make a search-statement and query things like this select * from table where col like '%vkvk%' But with trial and error I've come to the conclusion that access doesn't work with LIKE or wildcard operators. Does anybody have some other solutions because I ain't so in to access actually, so I really don't know.

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• Is jdbc or ldap faster for basic read operations?

  - by Brandon

  I have a set of user data which I am try to access. Due to the way our company's employee data is set up, the information is available both through LDAP and through a table in our DB. I was curious, for standard read operations which would generally be a higher performance query?

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• target Audience in MOSS2007

  - by Alkis Spyrou

  Hello, Well done on the great postings! I have a query: How can I add a single name/user/person in the target audience field of MOSS2007? Currenlty I am only allowed to add a MOSS group. However, many times there are a number of individual persons (that are in the same group) that I would like to add as audience.

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• Oracle multiset, collection and records

  - by Atul

  Can anybody Explain me why records are required. Can't we perform the same operation in pl/sql using loop and all. Also when multiset, records query can be used i.e. in which type of situation and which one will be the preference.

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• How many indexes will actually get used?

  - by Ender

  I'm writing a page that does very simple search queries, resulting in something like: SELECT * FROM my_table WHERE A in (a1, a2, a3) AND B in (b1, b2) AND C in (c1, c2, c3, c4) AND And so on for a variable number of columns, usually ~5. If I create a separate index for each column (one for A, one for B, one for C, not (A,B,C)), will all of them be used in the above query?

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• Get row where date column = today - SQL server noob

  - by Chin

  In sql 2005, instead of building a query from dateparts year, month and date, is there an more succinct way of writing the where clause? many thanks

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• What are the BIN$... tables in Oracle's ALL_TAB_COLUMNS table?

  - by Aaron Digulla

  When I query ALL_TAB_COLUMNS in Oracle, I see tables called BIN$frKctA83wMPgQEOSh0Az+A==$0 BIN$frKctA8cwMPgQEOSh0Az+A==$0 BIN$frQ1pdU2TgXgQEOSh0APxA==$0 BIN$frQ1pdVGTgXgQEOSh0APxA==$0 There is no corresponding entry in ALL_TABLES. What are those?

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• Is there any library to represent SQL queries as objects in Java code?

  - by Pregzt

  I was wondering if there is any library that can be used to represent SQL queries as objects in Java. In the code I have plenty of static variables of type java.lang.String that are hand written SQL queries. I would be looking for library having a nice fluent API that allows me to represent the queries as objects rather than strings. Example: Query q = select("DATE", "QUOTE") .from("STOCKMARKET") .where(eq("CORP", "?")) .orderBy("DATE", DESC);

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• Modify default queryset in django

  - by juanefren

  I have added a 'cancelled' field to my model, is there a way to modify the model default query to something like cancelled=False ? without having to modify all my filter/exclude queries ?

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• Stateless NHibernate for querying

  - by JontyMC

  We have a database that is updated via a background process. We are using NHibernate to query the data for display on the web UI, so we don't need change tracking or lazy-loading. If we mark all the mappings as mutable="false", is this the same as using a stateless session?

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• Getting contacts when ids are known

  - by frieza

  Hi, I have a list of 'n' contact ids corresponding to which I need to obtain the contact details. One simple way to make n queries using the contact ids and retrieve those contacts. But this will be very time-consuming especially if n is large. I would like to know if there is any simpler way to obtain these results (like batch query etc).

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