In SQL, How to add values after add a new column in the existing table?

Question

I created a table and inserted 3 rows. Then I added a new column using alter. How can I add values to the column without using any null values?

Answer 1

Update table table_name set column_name = value where 'condition'; 

I preferred to use p.key column for best result.

Answer 2

Two solutions.

1. Provide a default value for the column. This value will be used initially for all existing rows. The exact syntax depends on your database, but will will usually look like ..

this:

ALTER TABLE YourTable
ADD YourNewColumn INT NOT NULL
DEFAULT 10 
WITH VALUES;

2. Add the column with null values first. Then update all rows to enter the values you want.

Like so:

ALTER TABLE YourTable
ADD YourNewColumn INT NULL;

UPDATE YourTable SET YourNewColumn = 10; -- Or some more complex expression

Then, if you need to, alter the column to make it not null:

ALTER TABLE YourTable ALTER COLUMN YourNewColumn NOT NULL;

Answer 3

Suppose you have a Employee table with these columns Employee_ID, Emp_Name,Emp_Email initially. Later you decide to add Emp_Department column to this table. To enter values to this column, you can use the following query :

Update *Table_Name* set *NewlyAddedColumnName*=Value where *Columname(primary key column)*=value

Example update TblEmployee set Emp_Department='Marketing' where Emp_ID='101'

Answer 4

suppose emp is the table and Comm is the new column then fire the below query .

update emp set Comm=5000 

Answer 5

   update table_name
   set new_column=value

Answer 6

I think below SQL useful to you

update table_name set newly_added_column_name = value;