How
can create new column by query that column not in table:
We
have one table test in this table 2 columns
Sno,
name I want 3rd columns for ues then we have create 3rd
column by query and also fixed that column value “0”.
select sno,name,'0' as amount from test
Out
put:
sno
|
name
|
amount
|
1
|
cp
|
0
|
2
|
ram
|
0
|
3
|
jon
|
0
|
Understand diffrence between 1st
and 2nd query:
select sno,name,sno
as amount from
test
Output:
sno
|
name
|
amount
|
1
|
cp
|
1
|
2
|
ram
|
2
|
3
|
jon
|
3
|