I'm trying out this database layout under MS SQL (de), with primary multicolomn key, but ....
Let's say table A, has primary KEY on the field PK_A Let's say table B, has primary KEY on the field PK_B
Now table C, has fields ID_A and ID_B, defined as multicolomn primary key, referencing obviuosly to the PK_A and PK_B values.
NOW THE PROBLEM !! :(
Let present you table D , with his beautiful field ID_C. :) How can I succed in referencing with the ID_C field the primary multicolomn key of table C ??
I' designing the whole thing with access97+mde, but dragging the PK key of table C (ID_A & ID_B) over the table D (ID_C) doesn't work !!
my stored procedure have one table variable (@t_Replenishment_Rpt).I want to create an Index on this table variable.please advise any of them in this loop... below is my table variable and I need to create 3 indexes on this...
Is is possible to create a composite primary key on a table variable?Neither of these two statements are successful:DECLARE @opmcjf TABLE (jobdetailid INT NOT NULL,cjfid INT NOT NULL,cjfvalue VARCHAR(100) NULL)ALTER TABLE @opmcjf ADD CONSTRAINT [PK_opmcjf] PRIMARY KEY CLUSTERED([jobdetailid],[cjfid])andDECLARE @opmcjf TABLE (jobdetailid INT PRIMARY KEY,cjfid INT PRIMARY KEY,cjfvalue VARCHAR(100) NULL)Thanks,Shaun
Hi,I have a history table with about 400 million rows, with a uniquecomposite nonclustered index on two columns (object id and time period)which is used for most of the queries into the table, and an identitycolumn for the clustered primary key.Many of my queries use correlated subqueries to pull unique historyrows from the history table for each of a set of objects from theobject table, for instance, pulling the earliest history row for eachobject in a set. These correlated subqueries reference the object tableand return the primary key of the history table, e.g.:select *from lp_object linner join lp_object_history hon h.lp_object_id = l.lp_idwhere l.lp_set_id = 'SOME_LITERAL'and h.lp_id = (select top 1 lp_idfrom lp_object_historywhere lp_object_id = l.lp_idand lp_some_column > 0order by lp_time_period)Now, if lp_some_column is not indexed, this query has no choice but toread the entirety of every single history row for every object in theset where lp_set_id = 'SOME_LITERAL', so that it can determine iflp_some_column > 0, and because the history table is clustered by theidentity column rather than the ID of the relevant object whose historywe're tracking, the reads take forever - they have to bop all aroundthe disk. The sets I deal with tend to have about 5K objects in themand about 200K associated history rows.I'm considering reclustering by the (object id, time period) index, butthen my queries will need an extra bookmark lookup step to get the rowdata from the identity value returned by the correlated subquery. Ithink it will still be faster, though, so I will probably build a copyof the table with the alternative clustering scheme to run someperformance tests.What I'm wondering is, if I were to dispense with the identity columnaltogether and replace it with a composite primary key of (object id,time period), would I be still be able to use my correlated subqueries?Because then there wouldn't be a single column that uniquely identifieseach row in the history table and I don't think SQL Server supportsmulticolumn correlated subqueries.Thanks for reading,Seth
We have an entity such as a documentSearchKey that contains attribtes about a particular document. This document can have 1-N number of search keys or attributes. The classic Employee Table is a good example for a horizontal listing of attributes (fname, lname, SS#, address, etc.) because the employee entity has a "fixed" number of attributes so we can add columns across.
For the documentSearchKey entity attributes can be considered search keys or where clause values. The documentSearchKey entity has variable number of attributes (docType A has 5 keys, docType B has 15 keys, etc) For this example each docType lives inside its on table so there is not a problem with mixing a variable number attributes inside the same table i.e. we will assume this table has 20 keys vertical or 20 columns horizontal as defined below.
The problem is whether or not to add 20 columns across or to add 3 columns and create a non-normalized DB so additional keys can be added at will.
The proposed table now contains 3 columns (docID, KeyID, KeyValue). Of course, 10 keys for 1 million records create 10 million rows Versus the traditional table with 1 million records always has 1 million records(keys are cols) where some columns contain blanks or nulls.
Which design is better in terms of searching and performance? Also, books and links are welcome as well. This is a specific question to a production issue.
insert into #t(branchnumber) values (005) insert into #t(branchnumber) values (090) insert into #t(branchnumber) values (115) insert into #t(branchnumber) values (210) insert into #t(branchnumber) values (216)
[code]....
I have a parameter which should take multiple values into it and pass that to the code that i use. For, this i created a parameter and temporarily for testing i am passing some values into it.Using a dynamic SQL i am converting multiple values into multiple records as rows into another variable (called @QUERY). My question is, how to insert the values from variable into a table (table variable or temp table or CTE).OR Is there any way to parse the multiple values into a table. like if we pass multiple values into a parameter. those should go into a table as rows.
I need to add a child table that will tell us who the participants counselor is, what I did was I did a Make Table query based off the primary key of the Parent table and made that the link (foreign key) for the People_tbl and the Counselor_tbl, so if the counselor changes then the user adds the record to the counselor tbl and then puts in the Effective date. The problem is that when I run a report it doesn't show the present counselor always shows the old counselor?
Code: SELECT Student_ind.StudentFirstName, Student_ind.StudentLastName, Student_ind.[Student ID], People_tbl.[Family ID], People_tbl.FirstName, People_tbl.LastName, People_tbl.[Parent ID] FROM People_tbl RIGHT OUTER JOIN Student_ind ON People_tbl.[Family ID] = Student_ind.[Family ID] WHERE (People_tbl.LastName = @Enter_LastName) AND (People_tbl.FirstName = @Enter_FirstName)
Previously same records exists in table having primary key and table having foreign key . we have faced 7 records were lost from primary key table but same record exists in foreign key table.
Hi i have set up two very simple tables, I want a user to be able to create a basic account ( data stored in User_Profile table with Id set as the Primery Key as Identity) I want the user to be able to be able to return to their account at a later date and then post multiple reviews of different bands they have seen at a later date. I kept the tables in my example very simple so I could get my head around the concept, but generally, I want to connect the Id (PK) value in User_Profile table to the User_Id filed in the User_Review table, so every review that user writes, will be connected directly to their Id.
Any help you could give would be fantastic a i have no idea where to start!!!
User_Profile
Id int, ( as primary Identity Key)
Name
City
Country
I have a second table called User Reviews
User_Revews
Revew_Id int , ( as primary Identity Key)
User_Id int, ( I want this to contain the Id value in the User profile Table)
I have a Users table that I use for membership. I am using username varchar(30) as the primary key for this table since username will always be unique.
The question I have is regarding how SQL Server actually stores data:
I see that when I add users, they are always stored alphabetically sorted on username.
I was expecting that all users will appear on the users table in the order they were added.
Example: I have 3 users (john, jonah, wilson). Now I added 4 user with username='bob'
If I execute select * from users, it returns me (bob, john, jonah, wilson). Look bob has become the first row of the table.
My question: Is Sql server moving 3 older rows to make room for 'bob' and it is also rebuilding part of the index due this new username 'bob'?
If this is the case, then it will have big impact if I have 100K users and I add one user that becomes firstrow. In that case 99,999 rows will have to move.
Bottom line, insert, delete will be very expensive.
I know sql server keeps data physically sorted on PK. But I am concerned here since rows are losing the order in which they were inserted.
Simple example: declare @tTable(col1 int) insert into @tTable(col1) values (1) select * from @tTable
Works perfectly in SQL Server Management Studio and the database connection is OK to as I may generate PP table using complex (or simple) queries without difficulty.
But when trying to get this same result in a PP table I get an error, idem when replacing table variable by a temporary table.
Message: OLE DB or ODBC error. .... The current operation was cancelled because another operation the the transaction failed.
There is a restriction that we must have only one primary key per table. We can have composite primary key by defining primary key over 2 or more columns. Actually,, a primary key uniquely defines the table and if we have two or more columns which follow unique and not null features why can't we have two primary keys?? I want to know what is the main reason behind having only one primary key in a table??
I ran into a table that is used a lot. Well less than100,000 records. Maybe not a lot of records but i believethis table is used often. The table has 26 fields, 9 indexesbut no Primary Key at all!There are no table relationships defined in this database, noNatural keys, only Surrogate keys in the database.1- Maybe an odd question but is it normal to have 1/3 of thetable's fields as indexes? Is this a valid question or it reallydoesn't matter if you have 9 indexes if they are appropriate to beindexes?2- Below is the DDL of the indexes (Is DDL the appropriate termto describe the indexes?) Without going into too technical aboutwhat the table is, what relationships it has with other tables,would you be able to tell if the indexes are good, bad, too many,etc?3- If i open the table in DESIGN view in SQL EM, i don't seethe Primary key icon. Yet here i see the words "PRIMARY KEYNONCLUSTERED". Does this mean UNIQUENO is actually some typeof primary key? If it was CLUSTERED then SQL EM would showUNIQUEID with a key to the left it identifying it as a PK?If that is the case, then what is the difference betweenPRIMARY KEY NONCLUSTEREDandPRIMARY KEY CLUSTERED?CREATE UNIQUE CLUSTERED INDEX [TBLTEST_PK] ON[dbo].[TBLTEST]([UNIQUENO]) WITH FILLFACTOR = 80 ON [PRIMARY]GOCONSTRAINT [PK_TBLTEST] PRIMARY KEY NONCLUSTERED([UNIQUENO]) ON [PRIMARY]GOCREATE UNIQUE INDEX [ASSIGNUNIQUENAME] ON[dbo].[TBLTEST]([USERNO], [STARTDATE], [NAME]) WITHFILLFACTOR = 80 ON [PRIMARY]GOCREATE INDEX [ENDDATE] ON [dbo].[TBLTEST]([ENDDATE]) WITH FILLFACTOR = 80 ON [PRIMARY]GOCREATE UNIQUE INDEX [IUSERASSIGNACT] ON[dbo].[TBLTEST]([USERNO], [TASKNO], [PROCESSENTRYNO])WITH FILLFACTOR = 80 ON [PRIMARY]GOCREATE INDEX [STARTDATE] ON [dbo].[TBLTEST]([STARTDATE]) WITH FILLFACTOR = 80 ON [PRIMARY]GOCREATE INDEX [PROCESSENTRYNOTBLTEST] ON[dbo].[TBLTEST]([PROCESSENTRYNO]) WITHFILLFACTOR = 80 ON [PRIMARY]GO/****** The index created by the following statementis for internal use only. ******//****** It is not a real index but exists asstatistics only. ******/if (@@microsoftversion > 0x07000000 )EXEC ('CREATE STATISTICS [Statistic_NAME] ON[dbo].[TBLTEST] ([NAME]) ')GOCREATE INDEX [TASKNO_IDX] ON [dbo].[TBLTEST]([TASKNO]) WITH FILLFACTOR = 80 ON [PRIMARY]GOCREATE INDEX [TBLTEST_ORGANIZATIONNO_IDX] ON[dbo].[TBLTEST]([ORGANIZATIONNO]) WITHFILLFACTOR = 80 ON [PRIMARY]GOCREATE INDEX [TASKNOUSERNO] ON [dbo].[TBLTEST]([USERNO], [TASKNO]) WITH FILLFACTOR = 80 ON [PRIMARY]GOThank you
I have a table with about 8 columns as a primary key. I would like to delete one column but not destroy the other 7 primary keys and their relationships between the other tables. Is it possible to do this?
I am trying to use a stored procedure to update a column in a sql table using the value from a variable table I getting errors because my syntax is not correct. I think table aliases are not allowed in UPDATE statements.
This is my statement:
UPDATE [dbo].[sessions_teams] stc SET stc.[Talks] = fmt.found_talks_type FROM @Find_Missing_Talks fmt WHERE stc.sessionid IN (SELECT sessionid FROM @Find_Missing_Talks) AND stc.coupleid IN (SELECT coupleid FROM @Find_Missing_Talks)
I'm trying to find the primary key on a given table in SQL Server 2000 using SQL. I'm querying the sysobjects table to find a given table, and then querying the sysindexes table. I've ALMOST found what I'm looking for. I see the indexes and columns etc. on the tables in the database, I just don't see the field that indicates that the index is the primary key. Can anyone help? Thanks, Alex
I'm trying to drop a table onto the design view in Web Matrix and the following message appears: "dropped table does not have a primary key and cannot be used".
I'm using a SQL 2000 database that was previously an MSDE 2000 database. Is there anyway that I can define a column as a primary key?
I want to get the Primary Key Columns in Arrays by sending a tablename. I am using SQL Server 2000 and I want to make a find utility in VB.net whichwill work for all the forms; I have tables with one Primary key and some tables with composite Primary keys. I used to do this in VB 6 by making a function which fills the Primary Keys inList Box (I require to fill in list box), now I need to get in array. Can some one tell me the migration of the following VB 6 Code? This was written for the MS Access, I need same for SQL Server, I cannot find Table Def and Index Object in VB.net 2003. Public Sub GetFieldsFromDatabase (ldbDatabase As Database, lsTableName AsString) Dim lttabDef As TableDef Dim liCounter As Integer Dim liLoop As Integer Dim idxLoop As Index Dim fldLoop As Field With ldbDatabase For Each lttabDef In .TableDefs If lttabDef.Name = lsTableName Then liCounter = lttabDef.Fields.Count For liLoop = 0 To liCounter - 1 cboFieldLists.List(liLoop) = lttabDef.Fields(liLoop).Name Next liLoop For Each idxLoop In lttabDef.Indexes With idxLoop lblIndexName = .Name If .Primary Then liCounter = 0 For Each fldLoop In .Fields cboPrimaryKeys.List(liCounter) = fldLoop.Name liCounter = liCounter + 1 Next fldLoop End If End With Next cboFieldLists.ListIndex = 0 If cboPrimaryKeys.ListCount > 0 Then cboPrimaryKeys.ListIndex = 0 End If Exit For End If Next End WithEnd Sub
I need to find the primary key of a table, in MySQL i used SHOW COLUMNS and looped through them to find which one was primary if any. The MSSQL equivalent is SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = 'table_name' apparently. However the result doesnt give me any key information. How can i find out 1. if a primary key exists on a table 2. what column that primary key exists on
I have designed a simple table named "test" with ID as primary key and Name as a string data. When I delete a row from the table and insert a new row.. then the ID column increments itself by 1.. for eg : if i have 2 rows in my table
1 Karthik 2 you
if I delete the 2nd row and insert your name in the place of 2nd row.. actually my rows shows
I need to create a new table in our database. This table is not linked into the existing schema in anyway, so i'm not sure if I need a primary key or not. either way, coudl anyone tell me how to create a primary key ni the CREATE TABLE statement. I have tried searching but cannot find the answer.
i have table fff .it has two fields one is fno int , another is fnamevarchar(20)ffffno fname-------- -----------100 suresh102 rameshhere there is no not null constraint and identity column theni am add primary key constraint fno column pls help me
Hi all,How can get the primary key string from the given table name? i knowit should from system tables of "sysobjects, syscolumns, andsysconstraints", but when i execute the statement like that:select a.name from syscolumns a,sysobjects b,sysconstraints cwhere a.id = b.id and b.name ='Agreement' and a.id = c.id and a.colid= c.colid and c.status = 1i can't get the primary key out, what the trick here? bye the sql helpfile,'status' in sysconstraints table:1 = PRIMARY KEY constraint.2 = UNIQUE KEY constraint.what is exact value refers to PRIMARY KEY constraint?thanks,Robert
