Database Administrators Asked by user162241 on December 4, 2021
How do I generate table structure from a view, in one script? Will only need data types, I am seeking a Table Create Script with some type of dynamic sql
(1) can remove primary key/constraint,
(2) don’t care if null/not null added (would be nice to have however)
I have proposed sample question/answer below, feel free to code review, edit/optimize for other data types not included in table in future, special cases/issues/exceptions may have not accounted for. Is there any open source code for this by the way?
Table 1 and 2:
create table dbo.Customer
(
CustomerId int primary key,
CustomerName varchar(255),
ZipCode varchar(9)
)
create table dbo.CustomerTransaction
(
CustomerTransactionId int primary key identity(1,1),
CustomerId int,
SalesAmount numeric (10,2),
PurchaseDate datetime
)
View:
create view dbo.CustomerTransactionVw
as
select
ct.CustomerTransactionId,
ct.SalesAmount,
ct.PurchaseDate,
cust.CustomerId,
CustomerName,
cust.ZipCode
from dbo.CustomerTransaction ct
inner join dbo.Customer cust
on cust.CustomerId = ct.CustomerId
Intended Table Create Script:
create table dbo.CustomerTransactionBigTable
(
CustomerTransactionId int identity(1,1),
CustomerId int,
SalesAmount numeric (10,2),
PurchaseDate datetime,
CustomerId int,
CustomerName varchar(255),
ZipCode varchar(9)
)
Current Proposed Solution:
declare @TableCode varchar(max) = 'create table dbo.CustomerLargeTable
( ' +
(select STUFF((
SELECT ',
'
+ c.name + ' ' +
case
when t.name like '%char%' then t.name + '(' + cast(c.max_length as varchar(10)) + ')'
when t.name like '%numeric%' or t.name like '%decimal%' then t.name + '(' + cast(c.precision as varchar(10)) + ',' + cast(c.scale as varchar(10)) + ')'
else t.name
end
FROM .sys.columns c
inner JOIN sys.types t
on t.user_type_id = c.user_type_id
and t.system_type_id = c.system_type_id
where c.object_id = object_id('CustomerTransactionVw') and is_identity = 0
FOR XML PATH(''), TYPE).value('.','nvarchar(max)'),1,2,''))
+ '
)'
print @TableCode
Note: I am only interested in table structure DDL, not data DML
Since your question tag says SQL Server 2016, you could take advantage of sys.dm_exec_describe_first_result_set which became available in SQL Server 2012.
This dynamic management function takes a Transact-SQL statement as a parameter and describes the metadata of the first result set for the statement.
--Demo set up
DROP TABLE IF EXISTS [dbo].[Customers]
CREATE TABLE [dbo].[Customers](
[CustomerID] [nchar](5) NOT NULL,
[CompanyName] [nvarchar](40) NOT NULL,
[ContactName] [nvarchar](30) NULL,
[ContactTitle] [nvarchar](30) NULL,
[Address] [nvarchar](60) NULL,
[City] [nvarchar](15) NULL,
[Region] [nvarchar](15) NULL,
[PostalCode] [nvarchar](10) NULL,
[Country] [nvarchar](15) NULL,
[Phone] [nvarchar](24) NULL,
[Fax] [nvarchar](24) NULL
) ON [PRIMARY]
GO
DROP VIEW IF EXISTS CustomerView
GO
CREATE VIEW CustomerView
AS
SELECT *
FROM dbo.Customers
GO
-------------------------------
--The solution
SET NOCOUNT ON;
DECLARE @sql NVARCHAR(MAX)
,@cols NVARCHAR(MAX) = N'';
SELECT @cols += N',' + NAME + ' ' + system_type_name
FROM sys.dm_exec_describe_first_result_set(N'SELECT * FROM dbo.CustomerView', NULL, 1);
SET @cols = STUFF(@cols, 1, 1, N'');
SET @sql = N'CREATE TABLE #tmp(' + @cols + ');'
SET @sql = replace(@sql,',',',' + char(10))
print @sql
Results:
CREATE TABLE #tmp(CustomerID nchar(5),
CompanyName nvarchar(40),
ContactName nvarchar(30),
ContactTitle nvarchar(30),
Address nvarchar(60),
City nvarchar(15),
Region nvarchar(15),
PostalCode nvarchar(10),
Country nvarchar(15),
Phone nvarchar(24),
Fax nvarchar(24));
Answered by Scott Hodgin - Retired on December 4, 2021
I would utilise SELECT INTO.
SELECT TOP 0 *
INTO #SomeNewTable
FROM [SomeDB].[SomeSchema].[SomeView]
The above will create a new table with the same structure as the source view.
Answered by George.Palacios on December 4, 2021
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