Need Help With Some SQL Statements, Find Most Frequent Value In Column
Mar 11, 2008
How can I make a statement that will return the 10 most frequently occuring values in a column?
I have no idea if that is even possible, if you have an idea on how I could do that I would really appreciate it.
Im trying to make a page that would show some statistics on a table I have.
Im also trying to make something that would show the count of the number of records inserted in the last 24 hours, week, month, year etc. The table has a column called "DateInserted" as SmallDate, right now i can use a Where DateInserted > '20080310' to get the count, but its not dynamic, is there anyone to merge all these results into one row with each column being a diffrent time period?
I know this a lot of questions, but I would really appreciate any pointers.
we have a handful of developers and each of us are responsible for laying out and creating our own database backends. This often leads to inconsistencies in table and column structures.One obvious situation that comes up often is whether or not the other developers are building in history into their primary tables, using history/archive tables or (usually in cases of helper tables) no historical data at all.
My thought on how to alleviate this a little was to suggest that we all build a IS_DELETED computed column into our tables so that someone else trying to work with their data doesn't have to play the guessing game. In most cases, this column would just be running date comparisons on an Expiration Date and either checking to see if it's in the future (usually 12/31/9999) or NULL.
I have read that computed columns can be a performance hit if used/returned unnecessarily but is that also the case on fields where their main use would be filtering? It just seems that the calculation that the computed column is doing would be necessary for the WHERE anywhere so it seems like a wash ... and worth the benefit of not having to decipher someone else's work.
Hi,Where does Sql server store the most current active T-SQLstatements? Is there a system table or stored procedure(documented orundocumented)that will show you the active sql statements beingexecuted. For eg: in oracle you can query v$sql to see all the sqlstatements executed by each session.I know that you can use Enterprise manager, but was wondering if youcan run a query via query analyzer to look at it.Any help is appreciated.ThanksGeetha
STEP1: CREATE TABLE Trace(Statement VARCHAR(MAX)) INSERT INTO Trace VALUES('select * from Account'),('select * from Account') ,('Select LastUpdated,Lastdeleted,LastInserted from History'), ('Insert into Account Select lastUpdated from History'),('Delete from OldAccount where LastUpdatedId=3'),('Delete from OldAccount where LastDeletedId=3'),('Delete from OldAccount where LastInserted=3'),('DROP TABLE BMP')
[code]....
now,when i run step3 ; i wanted to see if there is actually a delete or insert or select or update happens but as i used like %% (matching characters) i am getting all names matching with the % % , example row 7 in above is there a way i can use any wildcards and only find if there is actual delete, actual insert, actual select, actual update statement happening.
I have read a lot of topics about execution plan for query, but I got little. Please give me some help with examples for comparing different select statements to find the best efficient select statement.
I need to list out all the procedures which have select queries and does not use NOLOCK hint. Please note that there are more than 2000 sps and some sps have single select some have multiple, some does not have select queries at all. I need to find out only the ones which does not use NOLOCK hint in a select query.
select dssid,cpt,count(*) from enc_vis_cpt group by dssid,cpt will give me the cpt's and their frequency for each dssid.
dssid cpt count SPINAL CORD INJURY 9934120 AMB SURGERY EVAL BY NON-MD 622703 PSYCHOSOCIAL REHAB - GROUP 993414 SPINAL CORD INJURY 983419 AMB SURGERY EVAL BY NON-MD 6327031 PSYCHOSOCIAL REHAB - GROUP 9734114 SPINAL CORD INJURY 9934280 AMB SURGERY EVAL BY NON-MD 6227353 PSYCHOSOCIAL REHAB - GROUP 9934524
How do I limit the output to just display the 10 most frequent cpt's for each dssid. Thank you...
Hi,Suppose I have a table containing monthly sales figures from my shopbranches:Branch Month Sales-----------------------London Jan 5000London Feb 4500London Mar 5200Cardiff Jan 2900Cardiff Feb 4100Cardiff Mar 3500The question I am trying to ask is this: in which month did each branchachieve its highest sales? So I want a result set something like this:Branch Month----------------London MarCardiff FebI can do a "SELECT Branch, MAX(Sales) FROM MonthlySales GROUP BY Branch" totell me what the highest monthly sales figure was, but I just can't figureout how to write a query to tell me which month corresponded to MAX(Sales).Ideas anyone?Cheers,....Andy
I am having issues trying to write a query that would provide me the unique GUID numbers associated with a distinct PID if the unique GUID's > 1. To summarize, I need a query that just shows which PID's have more than one unique GUID. A PID could have multiple GUID's that are the same, I'm looking for the PID's that have multiple GUID's that are different/unique.
Hello all I'm not sure if this is anything to be concerned about, but I'd appreciate some input. I've created an alert that invokes a log backup scheduled job to start if one of the production database log becomes over 80% full. I've noticed that the log gets backed up every couple of minutes- sometimes even more frequently- while a series of scheduled jobs are in the process of execution. Otherwise, it runs and backs up the log every hour as scheduled. I've also noticed that some of the jobs are taking longer to complete (they've been running for about 6 months now). Each job truncates the table that it populates with data, so I'm not sure what the cause of the delay is. It doesn't look like there is any fragmentation. Am I missing anything? Thanks
I have used Base SAS for analysis for a while and it was really great.. everything is easy just with a simple command.. I am sure it's not the same in SQL Server but I need some help on how to start with the following:
I have a field called call_country and another field called call_minute. Each call will be saved with the destination country and the total number of minutes..
and I want to run a query to see what are the TOP frequent destinations in this format:
There must be a way to do this simply. We're running SQL Server 2000. I'm looking for some generic SQL statement that I can apply.
If I have a table with a person column and a location column and multiple records for the same person / locatioin combination, how do I select the person with the location they most frequently visited? Say George visits Mexico 5 times, and the Bahamas twice and costa rica once. I would have 8 records in my table for George. The data looks something like this:
To clarify, I'm trying to create a hiearchial grid that will display projects and their sub projects.
The page the sproc is servicing is a search page where a user can display all projects by a customer or they can enter in a projectID and return info that way. Thus you'll see If else in what I have listed below. I highlighted in red the 2nd select statement I'm trying to get to run. One problem is I'm getting an error:
Msg 156, Level 15, State 1, Procedure sp_GetProjects, Line 33
Incorrect syntax near the keyword 'ELSE'.
Think this has something to do with me trying to run 2 select statements in an IF. Secondly, I'm not sure exactly what syntax I need to use to accomplish what I'm trying to do. Again, the first select statement is creating a table with all projects that match the passed custID, the second select statement I'm trying to generate a 2nd table that will take the projectID for each row returned to the first table and find all rows with the same projectID's in the BillGroup table.
I need these two tables returned to a dataset I'm populated with a sqldataadapter in .net so I can create a relationship between the two tables and then bind to a grid.
@custID nchar(25) = NULL,
@projectID bigint = NULL
IF @custID != 'null'
SELECT p.projectID, p.Description FROM Projects p
WHERE custID = @custID
SELECT * FROM Projects p
JOIN dbo.BillGroups bg ON p.projectID = bg.projectID
ELSE IF @projectID != -1
SELECT projectID, Description FROM Projects
WHERE projectID = @projectID
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
I have a reviews table where all reviews are submitted. On the main page I want to display the 10 most reviewed products. I have a Product_ID column in this table which identifys the product. How can i write a query which will select the product_ID of records which have the most frequent product_ID's?
I came up with something like this: "Select Top 10 Product_ID, COUNT(*) AS Occurances FROM reviews GROUP BY Product_ID ORDER BY occurances DESC"
But it does not work.?? It says "Declaration expected" as error
We have 7 databases mirrored on two servers which are mirroring partners. 3 of the 7 databases are live on server1 and mirrored on server2; and the remaining 4 databases are live on server2 and mirrored on server1. The data is exposed through .NET Widows Application.
The configurations of the servers are as follows.
System: Microsoft Windows Server 2003 R2
Standard x64 Edition
Service Pack 2
Computer: Intel(R) Xeon (R) CPU
5130 @ 2.00 GHz
2.00 GHz, 32.0 GB of RAM
SQL Version: Microsoft SQL Server 2005 - 9.00.3175.00 (X64) Jun 14 2007 11:45:39
Copyright (c) 1988-2005 Microsoft Corporation Enterprise Evaluation Edition (64-bit)
on Windows NT 5.2 (Build 3790: Service Pack 2)
Problem:
The databases for no apparent reason keep randomly failing over to one server quite frequently. At least twice a day. There is no pattern associated for me to make out as to why this is happening.
My Questions:
1. Is it a good practice to divide the databases on each server, the way it is now? Or should all the databases be kept on one server and mirrored on other all the time?
2. From the above mentioned scenario, do you find the reason for database to 'failing over' so frequently? Could the Win Application which is used to expose the data be responsible for the failovers?
3. What steps can be taken to check for the reason which is causing the databases to failover? Alternatively and most importantly, how can I this problem of 'Databases Failing over randomly' be solved?
What function(s) can be used to find the mode of data? I have a column that is populated with codes and I'd like to summarize the data by the code that occurs the most frequently. Any help is appreciated!!
I have one table with two columns, GUID and PID and another table with three columns, GUID, LastName, and FirstName. For each unique PID, I need to find the PID's that have more than one GUID and then match that with their respective FirstName and LastName from the other table.
I am working on a text mining application wherein I need to detect unusual/anomalous sentences in text. Certain sentences, that I know occur very frequently, are given a likelihood of 0.2 by PredictCaseLikelihood. Other sentences that are just as frequent get a much higher likelihood (>0.9). I am using the NORMALIZED option. The only significant difference between these sentences is their length. The one with the lower likelihood has only 2 words in it, whereas the one with the higher likelihood has more than 10 words. The problem is that the shorter sentences end up being interpreted as anomalous, when in fact they are'nt. Any suggestions?
I'm trying to import XML Data from a .xml file and then running openXML command to insert relevent data into SQL server 2005. First I'm importing XML records with help of Script Task(In SSIS) in batch of 1000 records in temporary String n passing this to Stored procedure ,which parses XML String with help of "sp_xml_preparedocument" .This SP it gives following error..
"An object or column name is missing or empty. For SELECT INTO statements, verify each column has a name. For other statements, look for empty alias names. Aliases defined as "" or [] are not allowed. Add a name or single space as the alias name."
I'm clueless about error,can some someone guide to workaround?
I had to enable identity_insert on a bunch of tables and I have already done that. Now I need to modify my insert into select * from statements to include column list names along with identity columns for select as well as insert statements. The DDL is same but they are both different databases.There are almost 100 tables that it needs to be modified. Is there a way we can generate scripts for insert and select for each individual table along with their column lists including the identity column?
I was querying to find the first non null address value using the COALESCE function.And I got the correct result.But then I jumped into another question and i.e what if I need to find the column name without knowing the column nameand just by using the column value.What I mean is this...My query was.....
SELECT COALESCE(AddressLine1,AddressLine2) AS [Addresss] FROM Person.Address This is what I got. Address#500-75 O'Connor Street#9900 2700 Production Way00, rue Saint-Lazare02, place de Fontenoy035, boulevard du Montparnasse081, boulevard du Montparnasse081, boulevard du Montparnasse084, boulevard du Montparnasse1 Corporate Center Drive1 Mt. Dell Drive
But then what if I just know the address of that person i.e #500-75 O'Connor Street..How am I suppose to retrieve that without knowing the column name.
I am constantly getting this error message in the Application log after installing SQL 2005 last night followed by SP1 (say 5 times a minutes). See below:
Hello! I have 80 tables in the database and I need to find in which table particular column exist. How can I do it shortly, without naming every table in my query? Thank you.
Greetings!I have a project that has been in production for a couple years now. It's a v1.1 ASP.NET web farm hitting a SQL database. The last couple weeks, the website has been erroring out on various pages for about 1-2 hours at a time twice a week. While the error messages are occurring, I cannot reproduce the errors myself. Here are some of the error messages I recieve:Cannot find column [ColumnName][ColumnName] is neither a DataColumn nor a DataRelation for table RESULT.[ColumnName] (This is a wierd one. The error message returned is just a column name)No record foundColumn '[ColumnName]' does not belong to table RESULT.I come to a dead end when I follow the Stack Trace to find a programmatic error. I'm able to hit the same page with all the same form fields at the error occured on and I cannot reproduce. The only consistentcy in these errors is that they come all at once and they are database related. Anyone have an issue like this before?
Hi,How to find first not null value in column whitout chacking whole table(if there is a not null value then show me it and stop searching, thetable is quite big)?thx,Martin*** Sent via Developersdex http://www.developersdex.com ***
