September 1, 2015 at 8:45 pm
Comments posted to this topic are about the item Column aliases
September 1, 2015 at 10:53 pm
Thank you Steve, but i want to suggest yet two ways
select test
from
(
select mynum
from dbo.myTable
) x(test);
select 15test
from dbo.myTable;
+
Your queries #1 and #6 are identical ?!
SELECT mynum AS test
FROM dbo.myTable AS mt;
September 1, 2015 at 11:25 pm
I think the same thing
AS Alias And AS 'Alias'
also i can write AS [Alias], or write CTE
so there are only three ways: "=", "AS" and column
I Have Nine Lives You Have One Only
THINK!
September 2, 2015 at 12:56 am
SELECT mynum AS test
FROM dbo.myTable AS mt;
...
SELECT mynum AS test
FROM dbo.myTable AS mt;
Can anyone enlighten me how the first and the last differ?
September 2, 2015 at 1:03 am
3 or 9 depends how you define different...
column AS alias
column AS 'alias'
column AS [alias]
column alias
column 'alias'
column [alias]
alias = column
'alias' = column
[alias] = column
And I didn't use double quotes.
I only lost one point...
September 2, 2015 at 1:05 am
The right answer
SELECT mynum AS test
FROM dbo.myTable AS mt;
SELECT test = mynum
FROM dbo.myTable AS mt;
SELECT 'test' = mynum
FROM dbo.myTable AS mt;
SELECT mynum test
FROM dbo.myTable AS mt;
SELECT mynum AS 'test'
FROM dbo.myTable AS mt;
SELECT mynum 'test'
FROM dbo.myTable AS mt;
September 2, 2015 at 1:06 am
Hi Steve, the first and the sixth SELECT statement are the same: Should not be 5 is the correct answer?
1st Query:
SELECT mynum AS test
FROM dbo.myTable AS mt;
6th Query:
SELECT mynum AS test
FROM dbo.myTable AS mt;
kind regards
Julien
September 2, 2015 at 1:08 am
Louis Hillebrand (9/2/2015)
3 or 9 depends how you define different...
column AS alias
column AS 'alias'
column AS [alias]
column alias
column 'alias'
column [alias]
alias = column
'alias' = column
[alias] = column
And I didn't use double quotes.
I only lost one point...
[] and "" regard "Naming convention for names" and not aliasing a column name.
September 2, 2015 at 1:09 am
"String literals as column aliases" are a deprecated feature!
September 2, 2015 at 1:14 am
No difference. Steve made a mistake. Can happen with anyone.
September 2, 2015 at 1:48 am
I've read the post and he says: "(I've ignored [alias] and "alias" variations for brevity.)". So even when he's talking about six different ways he was also admitting there are variations. That's why my reply was 7 instead of 6.
September 2, 2015 at 2:13 am
I didn't really care so just guessed and got it right.
Most developers will only ever use one method. That may depend on in-house standards but I'd recommend that used in the first example.
I imagine the sixth (duplicate) one should have had square brackets.
September 2, 2015 at 5:23 am
I wish you all a good afternoon. It is difficult to decide on the correct answer... 🙂
https://technet.microsoft.com/en-us/library/ms179300(v=sql.105).aspx
--==================================================================
USE AdventureWorks2014;-- or AdventureWorks2008R2;
GO
SELECT TOP 10 BusinessEntityID [Employee Identification Number]
FROM HumanResources.Employee;
SELECT TOP 10 BusinessEntityID 'Employee Identification Number'
FROM HumanResources.Employee;
SELECT TOP 10 BusinessEntityID "Employee Identification Number"
FROM HumanResources.Employee;
------------------------------------------------------------
SELECT TOP 10 BusinessEntityID AS [Employee Identification Number]
FROM HumanResources.Employee;
SELECT TOP 10 BusinessEntityID AS 'Employee Identification Number'
FROM HumanResources.Employee;
SELECT TOP 10 BusinessEntityID AS "Employee Identification Number"
FROM HumanResources.Employee;
---------------------------------------------------------------------------------------
SELECT TOP 10 [Employee Identification Number] = BusinessEntityID, NationalIDNumber as NatId
FROM HumanResources.Employee;
SELECT TOP 10 'Employee Identification Number' = BusinessEntityID, NationalIDNumber as NatId
FROM HumanResources.Employee;
SELECT TOP 10 "Employee Identification Number" = BusinessEntityID, NationalIDNumber as NatId
FROM HumanResources.Employee;
---------------------------------------------------------------------------------------
SELECT TOP 10 SalesOrderID, ShipDate,
DaysSinceShipped = DATEDIFF(dd, ShipDate, GETDATE() )
FROM Sales.SalesOrderHeader
WHERE ShipDate IS NOT NULL
----------------------------------------------------------------------------------------
September 2, 2015 at 5:41 am
handkot (9/1/2015)
I think the same thing
AS AliasAndAS 'Alias'also i can write
AS [Alias], or write CTEso there are only three ways: "=", "AS" and column
+1
ToddR
September 2, 2015 at 5:59 am
Stewart "Arturius" Campbell (9/2/2015)
Methinks thisis going to turn into an interesting discussion.Thanks fot the question, Steve
I'm thinking that your thinking is right. 😉
I wonder if this counts as an aliasing twice or three times:
WITH cte(EmployeeID, Name) AS (
SELECT ID UselessAlias, Name
FROM dbo.Employees
)
SELECT EmployeeID SomeID, Name
FROM cte;
Inside the CTE, the ID column is being aliased as UselessAlias.
Its being returned from the CTE as EmployeeID. Would you call this an alias?
In the outer SELECT, its then being aliased as SomeID.
So, would you call this 2 or 3 aliases?
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