Alter Table

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Hello everybody,

I have an employee table with three columns, they are emp_id, emp_name and emp_add.

How to set emp_id auto generated by 1? using query.

Thank you.

Posted 27-Oct-10 3:08am

sagar dube 07

Updated 27-Oct-10 3:37am

v4

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Dalek Dave 27-Oct-10 9:10am

Edited for Grammar and Syntax.

2 solutions

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Mohd Wasif · Answer 1 · 2010-10-27T03:13:00

go to design view and select data type as int now u will get properties there u need to put isidentityspecification make it yes and set seed value and increment value

Or by query use it

CSS

ALTER TABLE table-Name
{
    ADD COLUMN column-definition |
    ADD CONSTRAINT clause |
    DROP { PRIMARY KEY | FOREIGN KEY constraint-name | UNIQUE
     constraint-name | CHECK constraint-name | CONSTRAINT constraint-name }
    ALTER column-alteration |
    LOCKSIZE { ROW | TABLE }
}
column-definition:
Simple-column-Name DataType
[ Column-Level-Constraint ]*
[ [ WITH ] DEFAULT {ConstantExpression | NULL } ]
column-alteration:
column-Name SET DATA TYPE VARCHAR(integer) |
column-name SET INCREMENT BY integer-constant

Sandeep Mewara · Answer 2 · 2010-10-27T03:11:00

Solution 1

One of the ways:
1. Go to 'Design Table'
2. Select the column of 'emp_id'
3. See at the properties of the column below.
4. There is an option of making it if 'Identity' column - mark it yes
5. You can also define the increment to any number. By default it is 1.

Posted 27-Oct-10 3:11am

Sandeep Mewara