DDL – SQLpowered.com https://sqlpowered.com SQL Server + BI Thu, 24 Jul 2025 08:54:48 +0000 en-US hourly 1 https://sqlpowered.com/wp-content/uploads/2020/07/FavIcon-e1594067873682-99x100.png DDL – SQLpowered.com https://sqlpowered.com 32 32 Constraints https://sqlpowered.com/t-sql-commands/constraints/ Thu, 24 Jul 2025 08:53:22 +0000 https://sqlpowered.com/?post_type=t-sql-commands&p=5751 Add default constraint to column inline:

ALTER TABLE [dbo].[SampleTable] ADD Is_Archived BIT NOT NULL CONSTRAINT DF_dbo_Sample_Table_Is_Archived DEFAULT 0 

ALTER TABLE [dbo].[SampleTable] ADD Is_Cleaned_Up BIT CONSTRAINT DF_dbo_Sample_Table_Is_Archived DEFAULT 0 NOT NULL

 

]]> CREATE TABLE https://sqlpowered.com/t-sql-commands/create-table/ Sun, 05 Feb 2023 09:03:40 +0000 https://sqlpowered.com/?post_type=t-sql-commands&p=5524 Create Table with clustered Primary Key on Identity column:

CREATE TABLE [dbo].[SampleTable] (
	[Id] INT IDENTITY (1,1) NOT NULL,
	CONSTRAINT [PK_SampleTable] PRIMARY KEY CLUSTERED ([Id])
)

 

]]> ALTER TABLE https://sqlpowered.com/t-sql-commands/alter-table/ Thu, 30 Dec 2021 08:45:57 +0000 https://sqlpowered.com/?post_type=t-sql-commands&p=5292 Add New Column:

ALTER TABLE [dbo].[SampleTable] ADD [NewColum_1] NVARCHAR(MAX) -- will be added as NULLable
ALTER TABLE [dbo].[SampleTable] ADD [NewColum_1] NVARCHAR(MAX) NULL
ALTER TABLE [dbo].[SampleTable] ADD [NewColum_1] NVARCHAR(MAX) NOT NULL

Add Primary Key:

ALTER TABLE [dbo].[SampleTable] ADD CONSTRAINT PK_Sample_Table PRIMARY KEY CLUSTERED (Id)

Change data type for Primary Key column (IDENTITY setting will be persisted):

-- drop primary key constraint
ALTER TABLE [dbo].[SampleTable] DROP CONSTRAINT [PK_SampleTable]
GO

-- alter column
ALTER TABLE  [dbo].[SampleTable] ALTER COLUMN [Id] INT NOT NULL -- e.g. changed from SMALLINT to INT

-- recreate primary key constraint
ALTER TABLE [dbo].[SampleTable] ADD CONSTRAINT [PK_SampleTable] PRIMARY KEY CLUSTERED ( [Id] ASC )
GO
]]>