Does column order matter when creating a table? For example, Should NOT NULL columns always come before NULL columns? Should most frequently used columns always be near the top? What about text, ntext and image data types? Should they always appear near the end of the column order?
View 1 RepliesDoes column order really matter for Query Optimizer to pick index.Case 1: Say my CUSTOMER table has one composite index containing FirstName and LastName. FirstName exists prior than LastName. Does the column, FirstName and LastName, order matter to have Query Optimizer to utilize the index when I write WHERE clause in a SELECT statement?Statement 1:SELECT * FROM CUSTOMER WHERE FirstName = 'John' and LastName ='Smith'Statement 2:SELECT * FROM CUSTOMER WHERE LastName ='Smith' and FirstName = 'John' Will both statement 1 and 2 use the composite index or only statement 1?Case 2:Say my CUSTOMER has two single-column indexes. One index is on column FirstName. Another is on column LastName.For statement 1 and 2 above, which index will be picked by Query Optimizer or both? How does QO pick for index?I read couple book and some books say column order matter but some say no. Which one should I go with? I'm kind of confused.
View 2 Replies View RelatedDoes the order of columns make a difference in the GROUP BY?Woulde GROUP BY A, B, Creturn different results thanGROUP BY C,A,B ?
View 3 Replies View RelatedIf I join Table1 to Table2 with a WHERE condition, isit the same if I would join Table2 to Table1 consideringthat the size of the tables are different.Let's assume Table2 is much bigger than Table1.I've never used MERGE, HASH JOINs etc, do any ofthese help in this scenario?Thank you
View 3 Replies View RelatedI have 2 tables: Order(ID, Quantity) and Product(ID,Name, Price) and I want to add a calculated field in Order table based on the price column in the Product table. How do i do that?
this query returns the values i want in the table.
select a.quantity * b.price
from tblCustomerPurchases as a
join tblProduct as b
on a.ID=b.ID
I have two tables that I am trying to join and both have similar columns with which I am trying to use. One is Date and the other is LOGdate. Date's format is "01/01/2000" BUT LOGdate's is "01/01/2000 12:41:00 PM/AM". Can I join these two tables?
Any help would be greatly appreciated.
Thank you
I have two tables that I am trying to join and both have similar columns with which I am trying to use. One is Date and the other is LOGdate. Date's format is "01/01/2000" BUT LOGdate's is "01/01/2000 12:41:00 PM/AM". Can I join these two tables? If yes how do I get rid of the excess time on LOGdate.
Any help would be greatly appreciated.
Thank you
I have a table that I want to re-order the ID column. The ID are not in order now due to some insertion and deletion. What are the steps to re-order the ID column?
Thanks in advance.
This subject has been posted several times, but I haven't seen a goodanswer.Problem:I want to change the order of the columns in a table using T-SQL only.Explanation:After running your code, I want to see the following table...CREATE TABLE [dbo].[TableName] ([First_Column] [int] NULL ,[Second_Column] [varchar] (20) NULL) ON [PRIMARY]look like this...CREATE TABLE [dbo].[TableName] ([Second_Column] [varchar] (20) NULL ,[First_Column] [int] NULL) ON [PRIMARY]Limitations:Don't post if your post would fall in the following categories:1. If you don't think it can be done2. If you think Enterprise Manager is the only way to do this3. If you think I should just change the order of my Selectstatements4. If you want to state that order column doesn't matter in arelational database5. If you want to ask me why I want to do thisWish:Hopefully the answer WON'T involve creating a brand new table, movingthe data from old to new, dropping the old table, then renaming thenew table to the old name. Yes, I can do that. The table I'm workingwith is extremely huge -- I don't want to do the data juggling.Thanks in advance!
View 2 Replies View RelatedIs it possible to add a column to a table using the "alter table"statement and specify where in the sequence of columns the new columnsits. If not is there any way to alter the order of columns using TSQLrather than Enterprise Manager / Design Table.TIALaurence Breeze
View 2 Replies View RelatedI have two tables, one is called (questions), the second one (answers).
questions columns are (ID,questionTitle)
answers columns are (ID,questionID,answer, answerDate)
I use this query to load data: "SELECT q.questionTitle,COUNT (a.ID),a.answerDate FROM questions q LEFT JOIN answers a ON q.ID=a.questionID" the query is easy, but my problem which I can't solve is how can I fetch the data ordered by the column answerDate, I mean I want the first record to be the one which has the most recent answer and so on.
I would like to create a database that keeps track of our companies subject matter experts. I have roughed out some of the tables. I would appreciate any feedback on if this is the right approach and if there might be any issues when I start writting a front-end (probably VB 2005).
What makes this interesting (at least for me) is that a subject has an owner and at least 1 "expert", possibly up to 3. Here is what I am thinking for tables:
tblEmployee
EmployeeID (PK)
LastName
FirstName
etc......
tblSubject
SubjectID (PK)
Description
tblOwner
SubjectID (FK)
EmployeeID (FK)
tblExpert1
SubjectID (FK)
EmployeeID (FK)
tblExpert2
SubjectID (FK)
EmployeeID (FK)
tblExpert3
SubjectID (FK)
EmployeeID (FK)
Does this make sense? Would I run into any issues when trying to display this on a form in VB?
Thanks in advance for any help!!!!!
Cal
I am trying to create a table that holds info about a user; with the usual columns for firstName, lastName, etc.... no problem creating the table or it's columns, but how can I "restrict" the values of my State column in the 'users' table so that it only accepts values from the 'states' table?
View 2 Replies View Related
Say you have an existing populated SQL 2005 database, with 700+ tables, and you want to just change the order of the columns inside every table. Short of manually building conversion scripts, anyone know an automated way to do this? I was thinking thru ways to do them all in one shot, and have tools like Erwin and DbGhost that could be used also. Basically moving some standard audit columns from the end of the tables to just after the PK columns.
Thanks, Bruce
I have created new columns fields in a table using EManager. However, I am wondering Which command do we use to create columns through the analyser??? Is it the same like the "Insert into"?
View 3 Replies View RelatedHello,
I'm just using SSIS to build my first data warehouse. I've read quite a bit, but I'm stuck at the very first task: I need to assign a key column (just an int that starts at 1 and basically numbers the rows). What transformation do I use? I was going to use the derived column, but if that's the case, I don't know the script for the expression to do it. If I'm right, would someone mind supplying that also?
Thanks a lot,
Andy
Hello, everyone:
I have an Excel table that has columns like,
Vendoe_Name
Level
Address
Email
Phone
I use the statemen
SELECT * FROM OPENDATASOURCE('Microsoft.Jet.OLEDB.4.0',
'Data Source=C: est.xls;Extended Properties=Excel 8.0')...[Sheet1$]
and got output by column order,
Address
Email
Level
Phone
Vendoe_Name
How to make output by original column order like,
Vendoe_Name
Level
Address
Email
Phone
Any help will appreciated. Thanks
ZYT
Hello all,I'm using SS2K on W2k.I'v got a table say, humm, "Orders" with two fields in the PK:OrderDate and CustomerID. I would like to add an "ID" column whichwould be auto-increment (and would be the new PK). But, I would reallylike to have orders with the oldest OrderDate having the smallest IDnumber and, for a same OrderDate, I'd to have the smallest CustomerIDfirst. So my question is:How could I add an auto-increment column to a table and make it createits values in a particular order (sort by OrderDate then CustomerIDhere)?In the real situation, the table I want to modify has around 500krecords and the PK has 5 fields and I want to sort on three of them.Thanks for you helpYannick
View 7 Replies View RelatedI was just messing around with some ad hoc views and table returningUDFs today so I could look at and print out data from a small tableand noticed something strange.If I stick my select statement into a View the columns are returned inthe order I specify in the SELECT, but if the same statement is in a UDF(so I can specify a parameter), the columns are not returned in theorder specified in statement.I know that relations don't have a specified column order, but it was myunderstanding that a SELECT statement could be used to define how youwant your data presented. Views seem to respect the order specified inthe SELECT, but functions don't.What am I missing? Is there some way to force the order of the columnsreturned from a SELECT?View:CREATE VIEW dbo.View1ASSELECT Ident, Text, Type, ParentStmt, ForStmt, IfStmt, ChildStmt,ThenStmt, ElseStmt, NextStmtFROM dbo.tblStmtWHERE (Ident LIKE '4.2.%')Column order from this view:Ident, Text, Type, ParentStmt, ForStmt, IfStmt, ChildStmt, ThenStmt,ElseStmt, NextStmtFunction:ALTER FUNCTION dbo.Function1(@SearchPrm varchar(255))RETURNS TABLEASRETURN ( SELECT Ident, Text, Type, ParentStmt, ForStmt, IfStmt,ChildStmt, ThenStmt, ElseStmt, NextStmtFROM dbo.tblStmtWHERE (Ident LIKE @SearchPrm) )Column order from this function:Type, Text, ElseStmt, NextStmt, IfStmt, ChildStmt, ThenStmt, Ident,ParentStmt, ForStmtTable:(I know that this table isn't entirely normalized, but it serves mypurposes to have a matrix instead of a fully normalized relation):CREATE TABLE dbo.tblStmt (StmtID INT IDENTITY(1,1) CONSTRAINT PK_Stmt PRIMARY KEY,Ident VARCHAR(255),Text TEXT,ErrorText TEXT,Type INT,ParentStmt VARCHAR(255),ChildStmt VARCHAR(255),IfStmt VARCHAR(255),ForStmt VARCHAR(255),ThenStmt VARCHAR(255),ElseStmt VARCHAR(255),NextStmt VARCHAR(255),FullName VARCHAR(255),LocalName VARCHAR(255),Method INT)INSERT INTO tblStmt Ident, Text, Type, ParentStmt, NextStmtVALUES('4.2.1', 'LineNumberOfResp := EMPTY' 64, '4.2', '4.2.2')INSERT INTO tblStmt Ident, Text, Type, ParentStmt, ChildStmt, ForStmt,NextStmtVALUES('4.2.2', 'FOR K:= 1 TO 2', 128, '4.2', '4.2.3','4.2.7')INSERT INTO tblStmt Ident, Text, Type ParentStmt, ChildStmt, ForStmt,NextStmtVALUES('4.2.3', 'Person[K].KEEP', 16, '4.2', '4.2.3.1', '4.2.2', '4.2.4')INSERT INTO tblStmt Ident, Text, Type, ParentStmt, NextStmtVALUES('4.2.3.1' 'AuxInterviewerName := DOSENV', 64, '4.2.3', '4.2.3.2')
View 3 Replies View RelatedHi,Good morning to All.
I have some doubt.I cannot do anything without knowing the reason why we are doing that particular thing.
Any way, my doubt is:
While creating table, in some places I see COLLATE clause.
For example, recently I have seen this.
CREATE TABLE dbo.OrderDetails( OrderDetailID INT IDENTITY(1,1) NOT NULL, ItemNumber VARCHAR(20) COLLATE SQL_Latin1_General_CP1_CI_As NULL, Qty INT NULL)ON [PRIMARY]
In the above table, why the Collate clause for ItemNumber column? What is the advantage with that clause?I have seen sql server help for this. I have found 1011 results for the query SELECT * FROM fn_helpcollations().Then I searched for SQL_Latin related collations using: SELECT * FROM fn_helpcollations() where name like 'SQL_Latin%'I have found 31 results.How can I know which clause i have to use for which type of query?
Can anybody please tell answers for all these doubts?
Thanks in advance.
Regards,Ashok kumar.
In y sql server table has millions of records available. I don't want to drop the tables.
My requirement is I want to change the column order of an existing table. some tables I am able to saving on design window Like Below image.
Even I had generate a script and using that script trying to execute on Management Studio but unable to saving the new column orders. I am getting the Timeout expired error after couple of minutes. How can we save the orders without dropping the table !
I have detail table like
date item_id grade in out
------------- --------------- ------- -------- ----------
01-01-08 001 A 10 0
02-01-08 001 O 8 0
01-02-08 002 O 1 0
03-01-08 001 T 0 10
02-01-08 003 O 20 0
02-01-08 003 T 0 10
02-01-08 003 B 0 8
Result View
=======
Item_id A B O T Total
001 10 0 8 -10 8
002 0 0 1 0 1
003 0 8 20 -10 18
where grade could be any Alphabet, the column of result query could varies
each grade contain sum of (in-out) of all item_id of detail table.
Smartsys
This is a fairly simple question, but what is the easiest way to:create a new numbered column (where value is simply the row number) inan existing table and setting it as a primary key?
View 1 Replies View RelatedHow to sort table in sql2000 with ipaddress(format x.x.x.x) as column with nvarchar datatype in ascending order
without using stored procedure
Ex:
Table: netComputers(3 rows)
Column Name: ipAddress (string data type)
ipAddress
0.0.18.1
0.1.1.2
0.0.0.1
Sql query : if I use the query
Select ipAddress from netComputers order by cast( replace(ipaddress,'.','') as numeric(12)) asc
Gives result as :
ipAddress
0.0.0.1
0.1.1.2
0.0.18.1
Where as expected result should be:
ipAddress
0.0.0.1
0.0.18.1
0.1.1.2
I am trying to create a sample table in the Azure SQL Data warehouse but its giving me a syntax error Incorrect syntax near the keyword 'CLUSTERED'.
CREATE TABLE [dbo].[FactInternetSales]
( [ProductKey] int NOT NULL
, [OrderDateKey] int NOT NULL
, [CustomerKey] int NOT NULL
, [PromotionKey] int NOT NULL
[Code] ....
what's the correct syntax
I have the following column values (which represent the hours in a day) -
I want to be able to create a "child group" which would create 15 minute interval values under each hour, like -
0 15 30 45 60
So these would repeat under, each "hour" column value.
How can I do this ?
Hi,
We got a problem.
supposing we have a table like this:
CREATE TABLE a (
aId int IDENTITY(1,1) NOT NULL,
aName string2 NOT NULL
)
go
ALTER TABLE a ADD
CONSTRAINT PK_a PRIMARY KEY CLUSTERED (aId)
go
insert into a values ('bank of abcde');
insert into a values ('bank of abcde');
...
... (20 times)
select top 5 * from a order by aName
Result is:
6Bank of abcde
5Bank of abcde
4Bank of abcde
3Bank of abcde
2Bank of abcde
select top 10 * from a order by aName
Result is:
11Bank of abcde
10Bank of abcde
9Bank of abcde
8Bank of abcde
7Bank of abcde
6Bank of abcde
5Bank of abcde
4Bank of abcde
3Bank of abcde
2Bank of abcde
According to this result, user see the first 5 records with id 6, 5, 4, 3, 2 in page 1, but when he tries to view page 2, he still see the records with id 6, 5, 4, 3, 2. This is not correct for users. :eek:
Of course we can add order by aid also, but there are tons of sqls like this, we can't update our application in one shot.
So I ask for your advice here, is there any settings can tell the db use default sort order when the order by column value are the same? Or is there any other solution to resolve this problem in one shot?
Hi,
We got a problem.
supposing we have a table like this:
CREATE TABLE a (
aId int IDENTITY(1,1) NOT NULL,
aName string2 NOT NULL
)
go
ALTER TABLE a ADD
CONSTRAINT PK_a PRIMARY KEY CLUSTERED (aId)
go
insert into a values ('bank of abcde');
insert into a values ('bank of abcde');
...
... (20 times)
select top 5 * from a order by aName
Result is:
6 Bank of abcde
5 Bank of abcde
4 Bank of abcde
3 Bank of abcde
2 Bank of abcde
select top 10 * from a order by aName
Result is:
11 Bank of abcde
10 Bank of abcde
9 Bank of abcde
8 Bank of abcde
7 Bank of abcde
6 Bank of abcde
5 Bank of abcde
4 Bank of abcde
3 Bank of abcde
2 Bank of abcde
According to this result, user see the first 5 records with id 6, 5, 4, 3, 2 in page 1, but when he tries to view page 2, he still see the records with id 6, 5, 4, 3, 2. This is not correct for users.
Of course we can add order by aid also, but there are tons of sqls like this, we can't update our application in one shot.
So I ask for your advice here, is there any settings can tell the db use default sort order when the order by column value are the same? Or is there any other solution to resolve this problem in one shot?
I never paid much attention to this before but I noticed this today in a new table I was creating.
For tables defined in the tabular model the table properties have something like SELECT Blah FROM TableName ORDER BY Blah Then in the tabular model the table's data is in the same order it was ordered by in the data source for the table.
I have a date table I setup and I noticed it is NOT respecting the sort order.
I have it sorted by DateID which sorts with the oldest date first and newest date as last row.However, the table that is imported and stored in the data model is not in that order.
I can of course manually sort the rows in BIDS/DataTools, but I find this discrepancy odd.
Would this have negative impacts on the EARLIER function for example if the data rows are not in the order specified?
Hi!
I recently run into a senario when a procedure quiered a table without a order by clause. Luckily it retrived data in the prefered order.
The table returns the data in the same order in SQL Manager "Open Table"
So I started to wonder what deterimins the sort order when there is no order by clause ?
I researched this for a bit but found no straight answers. My table has no PK, but an identiy column.
Peace.
/P
Does anyone have a general rule or guide on when to use this SQL 2000 option when creating indexes? I was thinking generally on nonclustered indexes where the column would be unique and incremental and usually filtered on by range and often used in the order by clause. Such as columns of datetime or integers datatypes. Thanks.
View 1 Replies View Relatedhaving on mind that this is my Target server: what is the way of creating shared folder in order to perform operation from the title (and, of course, to continue with installation of packages etc...)? SQL SERVER 2008 R2
View 26 Replies View RelatedMorning Folks,
I'm setting up SQL Server 7.0 as follows:
12 Gb initial data load;
heavy transaction OLTP;
4 processors;
RAID5
disk space NOT an issue.
I'm trying to figure out what a reasonable initial size for both the Transaction Log and
Tempdb should be. I was thinking 100Mb for each. Is this reasonable, or could either afford
to have more?
Is there a percentage of the .mdf that is recognized as a general rule of thumb for setting up
the Transaction Log and/or Tempdb?
Also, is there any value in assigning Filegroups in a RAID5 setup?
Thanks,
Sergio