如何从本地 sql 表中删除 ID 列或将其更改为 AUTO INCREMENT？

Question

I want to get rid of the ID column I added to a local sql table.

When I deleted the column from the designer and tried to Update, I got this:

Another option would be to make the ID column AUTO INCREMENT by changing it to "[Id] INT NOT NULL AUTO INCREMENT,", but I also got an error when I added that to the table definition and selected Update.

Even when I change the Table back to what it is (add the ID column back) like so:

CREATE TABLE [dbo].[WordsToIgnore] (
    [Id]           INT        NOT NULL,
    [WordToIgnore] NCHAR (50) NOT NULL,
    [Source]       NCHAR (50) NOT NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC)
);

...I still get the err msg when I try to Update...

Answer 1

We need to define Column as given below. MSDN REFERENCE

<column_definition>::= column_name <data_type> [ FILESTREAM ] [ COLLATE collation_name ] [ SPARSE ] [ MASKED WITH ( FUNCTION = ' mask_function ') ] [ CONSTRAINT constraint_name [ DEFAULT constant_expression ] ] [ IDENTITY [ ( seed,increment ) ] [ NOT FOR REPLICATION ] [ GENERATED ALWAYS AS ROW { START | END } [ HIDDEN ] ] [ NULL | NOT NULL ] [ ROWGUIDCOL ] [ ENCRYPTED WITH ( COLUMN_ENCRYPTION_KEY = key_name, ENCRYPTION_TYPE = { DETERMINISTIC | RANDOMIZED }, ALGORITHM = 'AEAD_AES_256_CBC_HMAC_SHA_256' ) ] [ <column_constraint> [, ...n ] ] [ <column_index> ]

So, here it is:

CREATE TABLE [dbo].[WordsToIgnore] (
    Id INT IDENTITY(1,1) NOT NULL CONSTRAINT PK_WordsToIgnore PRIMARY KEY CLUSTERED,
    [WordToIgnore] NCHAR (50) NOT NULL,
    [Source]       NCHAR (50) NOT NULL,
    PRIMARY KEY CLUSTERED ([Id] ASC)
);

Or you can define constraint in a separate line

CREATE TABLE [dbo].[WordsToIgnore] (
    Id INT IDENTITY(1,1) NOT NULL ,
    [WordToIgnore] NCHAR (50) NOT NULL,
    [Source]       NCHAR (50) NOT NULL,
    CONSTRAINT PK_WordsToIgnore PRIMARY KEY CLUSTERED ([Id] ASC)
);

Answer 2

Based on this , the following should do the trick:

[Id] INT NOT NULL IDENTITY(1,1) PRIMARY KEY

(IOW, intrude the "IDENTITY(1,1)" jazz between "NULL" and "PRIMARY KEY"