SQL Server 2008 :: Check Constraint On Group Of Records?
May 25, 2015
I have groups of records in a table, and I would like to set a necessary condition on each group. The condition is that EXACTLY ONE of the records in each group has a flag field set to True (bit = 1). I can naturally write triggers for update, insert and delete events that test for such a condition.
Something along the lines of this condition:
(select count(ClovekAutoID)
from TableOfClovekNames tCN
where JeHlavni = 1
group by ClovekAutoID
having COUNT(JeHlavni ) > 1) = 1In fact,
I tried this just on whim, but naturally, the SS engine told me to go roll my hoop, that subqueries are not allowed in constraint expressions.
I want to set up a simple check constraint on a column limiting to values "Yes", "No" and ""I'm trying to use:CONSTRAINT IsAccessToItRestricted_ckcheck (IsAccessToItRestricted in('Yes,'No','');but this is not the right syntax.............. help!
If there are two different transactions, both of which update the username column to 'xyz' for userid = 234 in 'Users' table. This is a unique value for username. Ater this update each transaction adds a row to 'AppLog' table. The transaction is only committed after second operation. The 'username' column has a unique constraint on it. If transaction isolation level is 'read committed', and both transaction execute the first operation when neither of the transactions have been committed, then the transaction that calls COMMIT later will error out or not? If COMMIT does not check constraints then it will NOT error out. As a result we will have a violation of unique constraint happening without any error being thrown by SQL Server.
declare @table table ( ParentID INT, ChildID INT, Value float ) INSERT INTO @table SELECT 1,1,1.2
[code]....
This case ParentID - Child 1 ,1 & 2,2 and 3,3 records are called as parent where as null , 1 is child whoose parent is 1 similarly null,2 records are child whoose parent is 2 , .....
Now my requirement is to display parent records with value ascending and display next child records to the corresponding parent and parent records are sorted ascending
We have a domain joined SQL 2008 R2 server performing a snapshot database replication to a non-domain joined SQL 2008 R2 server. The snapshot replication is working with one exception. Under one of the tables, there is a Key, Constraint and Index that are part of the database. The Key and Indexes is copying over. However, the constraint is not. Why would the Key and Index copy but not the Constraint?
Our database crashed this morning and went into recovery mode.how I can track the progress of the recovery to determine how long it might take?The error log shows that it started up all the databases, then shows the recovery messages fr the msdb database, then shows that sql server is ready for client connections. I don't see any messages about my database recovery or the number of transactions to roll forward or background. If i run the sys.sp_readerrorlog and search for my database name, the only line returned is the starting up database message.
I do expect the database to take a while to recovery as it is about 8TB, there is plenty of free disk space about 3TB.The database started recovery while a transaction log backup was running so that backup failed,the last transaction log backup was taken 2 hours before recovery started. The last full backup completed about 5 days ago. The transaction log backup occurs every 2 hours and is typically around 16GB.
i have 70 SQL database servers and i setup DB Mail on the 70 Servers, i want to know is there a way to find the status of all the jobs which i assigned the DB Mail and if its working/failing... is there a script i can run on powershell or SQL to find out that information
I am working now on optimization of an update query for a particular table and I want to measure the number of page splits after each update. How to check it?
I have to figure out the items that Legal Name implies individual but Legal Entity Structure indicates a incorporation type. In this sample, you can see Alexander, Justin N. is my target. But my problem is how should I use a query to figure out which one is a individual's name? How should I write a function to check the name format (Last, First Middle)?
Legal Name ////////////////////////////////////// Legal_Entity_Struct
S & H Farm Supply, Ltd.////////////////////////////Company F.M.Abbott Power Equipment,Co.///////////////Company Ray's Dixie Chopper, Inc.////////////////////////// Company Alexander, Justin N. ///////////////////////////////// Company Alameda Power Equipment, Inc.//////////////// Company
I also have a RESOURCES table of phrases (for translation purposes) similar to this:
res_id res_lang res_phrase AccessDenied en Access Denied
For some rows in the resources table I do not have all language codes present so am missing some translations for a given res_id.My question is what query can I use to determine the RESOURCE.RES_IDs for which I do not have a translation for.
For example I might have a de, en, cz translation for a phrase but not a pl phrase and I need to identofy those rows in order that I can obtain translations for the missing RESOURCE rows.
Hi I was wodering how to add an OR statment right in the Check Constraint expression. This is what I am starting with in the database ([zip] like '[0-9][0-9][0-9][0-9][0-9]') and what I want well not exact but this would answer my question ([zip] like '[0-9][0-9][0-9][0-9][0-9] || [A-Z][A-Z][A-Z][A-Z][A-Z]') Thanks for any help
Hi, i want to put a check constraint on one of my tables to make sure that a member doesn't get loaded into the same usergroup twice. Could anyone please help me with this.
Here is some sample code:
Code Block
DECLARE @MyTable TABLE (ID INT IDENTITY(1,1), MemberID INT, ClientID INT, UsergroupID INT) INSERT INTO @MyTable VALUES (123456, 211, 3054) -- Member gets loaded twice INSERT INTO @MyTable VALUES (123456, 211, 3054) INSERT INTO @MyTable VALUES (123456, 211, 3055) -- Same Member as the top but into ---- a different usergroup which is correct INSERT INTO @MyTable VALUES (215489, 376, 2017) INSERT INTO @MyTable VALUES (987512, 345, 2237) INSERT INTO @MyTable VALUES (235479, 333, 1158) INSERT INTO @MyTable VALUES (354985, 333, 1158)
SELECT * FROM @MyTable
The problem i have is that if a member is loaded into the same usergroup twice then the sites crash on the web applications and the member can't get into his profile page.Unfortunately i don't know which one of the 1000 stored procedures are used to access this table so that i could just change the query to SELECT TOP 1.
However i think that it will be better practive to just put a check contraint on the table and avoide the whole problem.
However 1 member can belong to multiple usergroups.
In our database we have an indexed field that is using unique values, so in the index we turned on the unique property. Now with some changes we made in the application this value can be Null (could not be Null in the past). When we have more as 1 value having value Null we get an exception of unique key violation.
Therefor we want to make an check constraint the checks if the value allready exists when the value is not Null.
I'm trying to run a query to check the downtime in production lines, but if a line has assigned more than one cause for the downtime it repeat the info for each cause.
This is the code.
SELECT D.Line AS Line, D.ProductionLine AS ProductionLine, D.Shift AS Shift, D.DownTime, CONVERT(VARCHAR(10), D.DatePacked,101) AS DatePacked, AssignedDowntime, (D.DownTime - AssignedDowntime) AS NOASSIGNED, R.Enviromental,R.Equipment, R.IT_Systems, R.Material_External,R.Quality,R.Material_Internal, R.Method,R.PreProduction,R.People FROM ( SELECT Line, Shift, DatePacked, SUM(Cast(Downtime AS INT)) AS AssignedDowntime,
[Code] ....
I'm expecting that if is more than one "Down Reason "it will include in the same line. At this moment if i have more than one reason it create a line for each one for example:
If i have a total Downtime of 50 minutes and they are assigned 10 for itequipment, 30 by testequipment and 10 assigned to quality issues i will have and output like this:
I need to create a script task in sql server 2008 R2 to check if a file exists in a directory. For example, to see if output.dat exist under c:results. If the file exists, then send out an email stating the file exists, if not then send out another email stating the file does not exists.I noticed there is a huge difference between the script task in sql 2005 and sql 2008 r2.
Hi, I am trying to enforce a rule that only one record in a table can have status 'Active'. I'd like to do this with CHECK constraint rather than trigger. I know SQL server doesn't support subqueries such as : alter table add constraint chk_OnlyOneActive CHECK (1=(select count(*) from mytable where status='Active')) Is there any workaround for this? P.S. I tried using UDF like this: alter table add constraint chk_OnlyOneActive CHECK (dbo.NumActiveRecords()=1) and it works for insert - I am not able to insert a second "Active" record, but for some reason doesn't work for update - I am able to update existing record to status "Active" and end up with two or more Active records in the table. Thank you.
I am creating a check constraint on a field (GRID_NBR) for values between 1 & 99. I am a little confused on creating the expression for it (Books online is vague).
Can I use the following expression: GRID_NBR BETWEEN 1 AND 99
Or do I have to use: GRID_NBR > 0 AND GRID_NBR < 100
I have a table with 3 columns in it. The ID column has a datetime data type.
Does anyone know how to apply a check constraint on this field so that the same month cannot be entered twice.
For example the field has the following data in the field 26/04/2008 27/05/2008 26/06/2008 25/07/2008
A user then tries to enter the value 20/05/2008, I would like the check constraint to block this value being entered due to the fact that a item with the same month value has already been entered.
I have created a table which contains date periods. It has 3 fields all with DateTime data types. These fields being ID, BeginDate, and EndDate. The ID field will hold a date indicating what month the reord is for, ie 01/03/2007 being March or 05/04/2007 being April. The BeginDate will contain the beginnig date for the financial month and EndDate for the financial month.
I am trying to apply a check constraint on the ID field so that combaination of a month and year can only be entered once, ie. if 01/03/2007 already exists in the table then 03/03/2007 cannot.
I need to create a check constraint for an email column/field, where the field must contain an "@" symbol. Does sql (oracle or SQL in general) let you do this.
1. Tried myself: ALTER TABLE Q_Customer ADD CONSTRAINT Q_chk_Cus_email CHECK (Cus_email LIKE '%@%');
I want to incorporate a Check constraint within a trigger, based on this but im struggling with the coding.Assuming that is an Alphanumeric field you should be checking what value is in the alphanumeric column from inserted, comparing it with whatever is in the AMGR_User_Fields_Tbl to see if there’s a duplicate and then raising the error...This is my Trigger:
ALTER TRIGGER [dbo].[DUPLICATES] ON [dbo].[AMGR_User_Fields_Tbl]
FOR INSERT, UPDATE AS DECLARE @Alphanumericcol VARCHAR (750)
-- This trigger has been created to check that duplicate rows are not inserted into table.
-- Check if row exists SELECT @Alphanumericcol FROM Inserted i, AMGR_User_Fields_Tbl t
I am having some difficulties to find the documentation relative to the syntax of CHECK and CONTRAINT in MS SQL Server 2005. Can someone points me toward a reference guide?
Thanks in advance, Joannès http://www.peoplewords.com
