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• SqlCE Flush Interval - Will the default setting lead to corruption?

  - by NormD

  SqlCE has a parameter set on the Connect String called Flush Interval. It is defined as: The interval time (in seconds) before all committed transactions are flushed to disk. If not specified, the default value is 10. I thought that a committed transaction, by definition, is a transaction that has been flushed to disk, specifically the database file. If a transaction is only stored in RAM then cannot the transaction be easily lost? I thought that transactions were first written to a log file and then applied to the database file itself, so perhaps this parameter could mean the time to wait until the transaction log is applied to the database file? I would have thought that this parameter should be 0.

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• make select @@IDENTITY; a long?

  - by acidzombie24

  I am grabbing the last rowid and i am doing this select @@IDENTITY pk = (long)cmd.ExecuteScalar(); I get an invalid typecast bc this is int instead of long. Why doesnt this return a long? can i make it return long? Solution for now is to use pk = Convert.ToInt64(cmd.ExecuteScalar());

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• mysql: what is a temporary table?

  - by every_answer_gets_a_point

  what is the purpose of a temporary table like in this statement? how is it different than a regular table? CREATE TEMPORARY TABLE tmptable SELECT A.* FROM batchinfo_2009 AS A, calibration_2009 AS B WHERE A.reporttime LIKE '%2010%' AND A.rowid = B.rowid;

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• How do I display/compare a dynamic value of a mysql row in a if statement?

  - by Ralph The Mouf

  I have a checkboxes on my site that when unchecked, update their row in in the db as unchecked, and if checked,update their row in the db as checked. I am creating an ifstatement that will commence with its command if checked, and not if unchecked. I have echoed the variable and it is holding the proper value (checked or unchecked) but not sure if I am syntactically correct on displaying the state of the row in the db. This is what I am trying and will not work. I am new at php still and thank you very much for any help. if($auth->check_prof == 'checked'){// do the stuff in here}

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• How do I find the latest TimeStamp(DateTime) for each of my products in combination with another con

  - by radbyx

  Hi, I've two tables: Product: ProductID ProductName StateLog: StateLogID ProductID (Foreign Key) State (bit) TimeStramp (DateTime) I need to find the heighest StateLog.TimeStamp for each StateLog.ProductID there have the StateLog.State = 0

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• How do you check if a certain index exists in a table?

  - by Lieven Cardoen

  Something like this: SELECT * FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_NAME ='FK_TreeNodesBinaryAssets_BinaryAssets' and TABLE_NAME = 'TreeNodesBinaryAssets' but for indexes.

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• How can I connect to Sybase with Perl?

  - by Mike

  I'm trying to a good Perl module to use for connecting to a Sybase database. My Googling has led me to see sybperl as a possible choice, but it hasn't been updated since 2005.

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• Visual Studio 2010 ADO.NET Data Model vs Linq to SQL

  - by LaGrad

  What's the difference between the two? They seem to have the same functionality at first glance. Which one has faster performance which one is easier to use?

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• How to convert the time difference to hours(with 2 decimal place) in derby?

  - by jl

  Hi, I am using timestampdiff in derby db to retrieve the time difference between 2 time: startdate, and enddate. e.g. startdate = 2010-02-23 02:59:52.045 enddate = 2010-02-23 03:45:39.898 select {fn timestampdiff(SQL_TSI_HOUR, startdate, enddate)} as diff I would like to know how can I get the time diff in hours, e.g. 0.25, etc? Thank you.

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• How to check if resultset has only one row or more?

  - by TopCoder

  How to check if resultset has only one row or more?

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• MySQL join not returning rows

  - by John

  I'm attempting to create an anti-bruteforcer for the login page on a website. Unfortunately, my query is not working as expected. I would like to test how many times an IP address has attempted to login, and also return the ID of the user for my next step in the login process. However, I'm having a problem with the query... for one thing, this would only return rows if it was the same user as they had been trying to login to before. I need it to be any user. Secondly, regardless of whether I use LEFT JOIN, RIGHT JOIN, INNER JOIN or JOIN, it will not return the user's ID unless there is a row for the user in login_attempts. SELECT COUNT(`la`.`id`), `u`.`id` FROM `users` AS `u` LEFT JOIN `login_attempts` AS `la` ON `u`.`id` = `la`.`user_id` WHERE `u`.`username` = 'admin' AND `la`.`ip_address` = '127.0.0.1' AND `la`.`timestamp` >= '1'

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• Load huge sql dump to mySql

  - by jonathan

  Hi I have a huge mysql dump file generated from phpmyAdmin (150 000 lines of create table, inserts....) The mySql query tool fails to open such a big file. As a result i can't insert all the records. Is there a way to do this ? Thanks John

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• SELECT Data from multiple tables?

  - by Kyle R

  I have 3 tables, with 3 fields all the same. I basically want to select information from each table For example: userid = 1 I want to select data from all 3 tables, where userid = 1 I am currently using: SELECT r.*, p.*, l.* FROM random r LEFT JOIN pandom p ON r.userid = p.userid LEFT JOIN landom l ON l.userid = r.userid WHERE r.userid = '1' LIMIT 0, 30 But it doesn't seem to work.

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• Does this behavior exist in all major databases?

  - by user198729

  mysql> select 0.121='0.121'; +---------------+ | 0.121='0.121' | +---------------+ | 1 | +---------------+ Does it hold for other database that number='number' is true?

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• TSQL to Map User to Database

  - by dtrick

  So I'm not able to user enterprise manager to do this... If I was I wouldn't even be asking this question. So I'm wondering if there is a way through TSQL to execute a command that maps a User to a particular Database and grants them 'owner' permissions. Thanks...

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• SQL Syntax for multiple conditions in the same field

  - by Jonathan

  I can't seem to find this in the mysql manual: How do you enter multiple conditions for the same field in a select statement? e.g.: SELECT * FROM table WHERE ID = '1, 2, 3, 4' Is there a way to do this without using this: SELECT * FROM table WHERE ID = '1' OR ID = '2' OR ID = '3' OR ID = '4'

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• How to do Group By in grails to order by Count(*)

  - by skurt

  How do I translate: SELECT COUNT(*) AS `count`, `a` FROM `b` GROUP BY `a` ORDER BY `a` into grails or gorm query?

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• Why am I getting a MySQL error?

  - by John Hoffman

  Here is my query. Its intention is allow access to properties of the animals that constitute a match of two animals. The match table contains columns for animal1ID and animal2ID to store which animals constitute the match. SELECT id, (SELECT * FROM animals WHERE animals.id=matches.animal1ID) AS animal1, (SELECT * FROM users WHERE animals.id=matches.animalID) AS animal2 FROM matches WHERE id=5 However, MySQl returns this error: Operand should contain 1 column(s). Why? Is there an alternative way to do this, perhaps with a JOIN statement?

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• check if a value is NULL or Less than 0 in one TSQL statement

  - by Name.IsNullOrEmpty

  ISNULL(SUM(MyTable.Total), 0) AS Total how can i modify the above statement to also check if Total is less than 0 (zero), such that if Total is NULL or less than 0 (negative), i assign 0 to Total

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• How do I delete every row except the last one for each day?

  - by A B

  I have a table with stock quotes that looks something like this: id, date, stock_id, value Every day has several rows for each stock_id (it is automatically updated every five minutes), so the table is rather big at the moment. How do i delete every row but the last one each day for every stock_id?

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• what does this ADO OPEN Method do?

  - by every_answer_gets_a_point

  in plain english can you explain to me what happens here: rs.Open "batchinfo", oConn, adOpenKeyset, adLockOptimistic, adCmdTable what i need to do is to be able to insert values into a table called batchinfo. would this be the best way to do an OPEN? the only thing i would be doing is inserting values.

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• ERROR: there is no parameter $1 when creating view

  - by idlemoments

  When we try to create a view within a funcion we get ERROR: there is no parameter $1. This is the sample code. Begin CREATE VIEW artikelnr AS SELECT datum, 'uitgifte' as "type", CASE WHEN 'test'='test' THEN 0 END as "aantal ontvangen", aantal as "aantal uitgegeven" FROM uitgifteregel JOIN artikel ON artikel.artikelnr = new.artikelnr JOIN uitgifte ON uitgifte.uitgiftenr = uitgifteregel.uitgiftenr UNION SELECT datum, 'ontvangst' as "type", aantal as "aantal ontvangen" , CASE WHEN 'test'='test' THEN 0 END as "aantal uitgegeven" FROM ontvangstregel JOIN artikel ON artikel.artikelnr = new.artikelnr JOIN ontvangst ON ontvangst.ontvangstnr = ontvangstregel.ontvangstnr; Return new; end; When we replace new.artikelnr on line 7 with value 1 it works like it should, but the function needs to work with different artikelnr's. example line 7: JOIN artikel ON artikel.artikelnr = new.artikelnr Please point us in the right direction.

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• How do database servers decide which order to return rows without any "order by" statements?

  - by Chris

  Kind of a whimsical question, always something I've wondered about and I figure knowing why it does what it does might deepen my understanding a bit. Let's say I do "SELECT TOP 10 * FROM TableName". In short timeframes, the same 10 rows come back, so it doesn't seem random. They weren't the first or last created. In my massive sample size of...one table, it isn't returning the min or max auto-incrementing primary key value. I also figure the problem gets more complex when taking joins into account. My database of choice is MSSQL, but I figure this might be an interesting question regardless of the platform.

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• Please help translate this in linq to ef

  - by user3487644

  StringBuilder sb = new StringBuilder(); sb.AppendLine("SELECT"); sb.AppendLine(String.Format(" (SELECT TOP 1 CAST(ProspectID AS VARCHAR(5)) FROM Lead_Import_Fail Where ProspectID < {0} AND ProspectFullName = '{1}')", Convert.ToInt64(lead.LeadID), lead.Name)); sb.AppendLine(String.Format(", (SELECT TOP 1 CAST(ProspectID AS VARCHAR(5)) FROM Lead_Import_Fail Where ProspectID < {0} AND ProspectNRICPassport = '{1}')", Convert.ToInt64(lead.LeadID), lead.NRIC)); Thanks in advance.

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• Problems while trying to make a query with variables in the conditions (stored procedure)

  - by pablo89

  Hi!! Im having a problem, Im trying to do a query... I remember that in the past I did something like this but today this query is returning nothing, no error, no data, just nothing... the query is something like this: SELECT field1, @variableX:=field2 FROM table WHERE (SELECT COUNT(fieldA) FROM table2 WHERE fieldB=@variableX AND fieldC=0)0 AND (SELECT COUNT(fieldA) FROM table2 WHERE fieldB=@variableX AND fieldC=4)=0; I also tried this query but it didnt work (also it gaves no error): SELECT field1, @variableX:=field2, @variableY:=(SELECT COUNT(fieldA) FROM table2 WHERE fieldB=@variableX AND fieldC=0), @variableZ:=(SELECT COUNT(fieldA) FROM table2 WHERE fieldB=@variableX AND fieldC=4) FROM table WHERE @variableY0 AND @variableZ=0; As you can see, what Im trying to do in the 1st query is use a variable in the conditions; in the 2nd query Im trying to create some variables and evaluate them in the conditions. At the end in the 2nd query the @variableY=1 AND @variableZ=0 but I dont know what the query returns an empty data What could be wrong here??? Any comment or suggest is welcome!!! thanks!!! Bye!!!

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