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• How to set up a specific registration on Database

  - by ymorenz

  I'm creating a database so I can access names of people from a university. But I would like to create a registration ID for each person like 1012607, of which the first 2 numbers would be the year (11 for 2011) and the third digit would be the semester they registered (1 in the beginning of the year and 2 in the end of the year). The other 4 digits would be incremental. I don't know how to code a prefixed number in MySQL that can change only the last 4 digits and after a year change the first 2 digits every time you have a new registration. Can someone please help me?

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• Using closes sql connection brought over by a function

  - by iefpw

  Would this using close this _connection? using(SqlConnection _connection = Class1.GetSqlConnection()) { //code inside the connection } //connection should be closed/ended? I'm just wondering because GetSqlConnection() is a static function of Class1 and the whole connection might not be closed because it is calling outside class' static function instead of straight? using(SqlConnection _connection = new SqlConnection(_connectionString) { //code inside the connection }

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• SQL running slow when i executes thru java

  - by user270885

  I am trying to execute a query in oracle db. When i try to run thru SQLTools the query is executing in 2 seconds and when i run the same query thru JAVA it is exectuting in more than a minute. I am using a hint /*+ordered use_nl (a, b)*/ I am using ojdbc6.jar Is it because of any JARS? Please help whats causing this?

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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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• Why do these seemingly similar queries have such drastically different run times?

  - by Jherico

  I'm working with an oracle DB trying to tune some queries and I'm having trouble understanding why working a particular clause in a particular way has such a drastic impact on the query performance. Here is a performant version of the query I'm doing select * from ( select a.*, rownum rn from ( select * from table_foo ) a where rownum < 3 ) where rn >= 2 The same query by replacing the last two lines with this ) a where rownum >=2 rownum < 3 ) performs horribly. Several orders of magnitude worse ) a where rownum between 2 and 3 ) also performs horribly. I don't understand the magic from the first query and how to apply it to further similar queries.

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• least value in count

  - by Nyfer

  i have a table employee(id,dept_id,salary,hire_date,job_id) . the following query i have to execute. Show all the employee who were hired on the day of the week on which least no of employee were hired. i have done the query, but am not able to get the least. please check if am correct. select id, WEEKDAY(hire_date)+1 as days,count(WEEKDAY(hire_date)+1) as count from test.employee group by days

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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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• 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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• 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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• 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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• 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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• SELECT DISTINCT on a field not appearing in recordset?

  - by user151841

  I want to do a SELECT DISTINCT guid, ..., but I don't want guid appearing in the recordset. How do I do this?

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• Complex SELECT statement; one-to-many all details in one row

  - by RubyWedge

  There are two tables: Products ID (Primary Key), ProductName PlannedByMonths ProductID (Primary Key) (Link to the Products table many-to-one), MonthNumber (Primary Key), QtytoProduce, How to write SELECT statement to retrieve results in the following format? ProductName, QtytoProduceMonth1, QtytoProduceMonth2, QtytoProduceMonth3, QtytoProduceMonth4, QtytoProduceMonth5, QtytoProduceMonth6, QtytoProduceMonth7, QtytoProduceMonth8, QtytoProduceMonth9, QtytoProduceMonth10, QtytoProduceMonth11, QtytoProduceMonth12 Thank you.

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• Caluculating sum of activity

  - by Maddy

  I have a table which is with following kind of information activity cost order date other information 10 1 100 -- 20 2 100 10 1 100 30 4 100 40 4 100 20 2 100 40 4 100 20 2 100 10 1 101 10 1 101 20 1 101 My requirement is to get sum of all activities over a work order ex: for order 100 1+2+4+4=11 1(for activity 10) 2(for activity 20) 4 (for activity 30) etc. i tried with group by, its taking lot time for calculation. There are 1lakh plus records in warehouse. is there any possibility in efficient way. SELECT SUM(MIN(cost)) FROM COST_WAREHOUSE a WHERE order = 100 GROUP BY (order, ACTIVITY)

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• How to deal with 2 almost identical tables

  - by jgritty

  I have a table of baseball stats, something like this: CREATE TABLE batting_stats( ab INTEGER, pa INTEGER, r INTEGER, h INTEGER, hr INTEGER, rbi INTEGER, playerID INTEGER, FOREIGN KEY(playerID) REFERENCES player(playerID) ); But then I have a table of stats that are basically exactly the same, but for a team: CREATE TABLE team_batting_stats( ab INTEGER, pa INTEGER, r INTEGER, h INTEGER, hr INTEGER, rbi INTEGER, teamID INTEGER, FOREIGN KEY(teamID) REFERENCES team(teamID) ); My first instinct is to scrap the Foreign key and generalize the ID, but I still have a problem, I have these 2 tables, and they can't have overlapping IDs: CREATE TABLE player( playerID INTEGER PRIMARY KEY, firstname TEXT, lastname TEXT, number INTEGER, teamID INTEGER, FOREIGN KEY(teamID) REFERENCES team(teamID) ); CREATE TABLE team( teamID INTEGER PRIMARY KEY, name TEXT, city TEXT, ); I feel like I'm overlooking something obvious that could solve this problem and reduce stats to a single table.

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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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• equal insread of distinct

  - by MirooEgypt

  SELECT DISTINCT IncreasmentAmount, Name, regionid FROM Pricing.GroupOfRegions where regionid in (6,7) i have this result 12.80 AB 6 13.00 ABC 6 15.00 AC 6 12.80 AB 7 13.00 ABC 7 i wanna add more condition where IncreasmentAmount are equals which means i got the rows where regionid in (6,7) and have the same IncreasmentAmount so i got finally 12.80 AB 6 12.80 AB 7

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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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• 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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• 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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• Selecting all tables with no records

  - by sqlgrasshopper5

  I need to display all tables that have zero records. I tried, select * from user_all_tables where (select count(*) from user_all_tables)=0; But it doesn't seem to work. How should I go about redesigning this query? Thanks.

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• How to pass and Return a Array to stored procedure?

  - by padmavathi

  I would like to know how to pass an array to a stored procedure which in turn will return an array from c# .net? Thanks& Regards Padma

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• Query to select from two different tables

  - by ryan

  I would like to select from two tables and display my result using this query: CREATE TABLE Buy_Table ( buy_id int identity primary key, user_id int, amount decimal (18,2) ); go INSERT INTO Buy_Table (user_id, amount) VALUES ('1', 10), ('1', 8), ('1', 20), ('3', 1), ('2', 2); go CREATE TABLE Sell_Table ( sell_id int identity primary key, user_id int, amount decimal (18,2) ); go INSERT INTO Sell_Table (user_id, amount) VALUES ('1', 10), ('1', 8), ('1', 20), ('3', 3), ('2', 3); go select [user_id], 'Buy' as [Type], buy_id as [ID], amount from Buy_Table union all select [user_id], 'Sell', sell_id, amount from Sell_Table order by [user_id], [ID], [Type] However the above query will return each row of the user_id like this I want to display my result to something like this in a grid: Can this be done in query itself rather manipulating the grid? Thx

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• Can I use TSQL to operate on normal os files? Such as create a .bat file and write some query result

  - by Yousui

  Hi guys, Can I use TSQL to operate on normal operating system files? Such as create a .bat file at c:\test and write some query result into that batch file? Thanks.

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• Table Design for (Currently Viewing Videos)?

  - by Surya sasidhar

  hi, I am doing a project on video portal, in that i am trying to place for currently viewing videos. People who r currently viewing that video. For this i have design the table like this table:(columns) Sno,videoid,sessionid,userid,createddate these are the columns but it is not sufficient i think if possible can u help me how can i design the table. how can we perfectly represent the currently viewing videos. Please help me thank you

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