Add Column To one table on inserting value to another table - sql

Question

I have two tables Branch_TB and Branch_City.
Branch_TB :
CREATE TABLE Branch_TB(
Branch_Id int NULL,
Branch_Name varchar(50) NULL
)
Whenever there is an entry for Branch_Name, I want to add that entry as column name in Branch_City.
Is there any way for this. I don't know how to do this and haven't try any solution.
Thanks in advance.

Answer 1

You can achieve that using AFTER INSERT TRIGGER.
CREATE TABLE Branch_TB(
Branch_Id int NULL,
Branch_Name varchar(50) NULL
)
go
--drop table BranchCity
create table BranchCity(abc varchar(20))
go
create TRIGGER dbo.AddCol
ON Branch_TB
AFTER INSERT AS
BEGIN
DECLARE #NewVal VARCHAR(20)
DECLARE #AlterSQL VARCHAR(100)
CREATE TABLE #New
(
VAL VARCHAR(20)
)
INSERT INTO #New
select Branch_Name from inserted
select #NewVal = Val from #New
SET #AlterSQL = 'ALTER TABLE BranchCity add ' + #NewVal + ' VARCHAR(20)'
exec(#AlterSQL)
END
go
insert into Branch_Tb
values(1, 'City1')
go
insert into Branch_Tb
values(2, 'City2')
But in my opinion, you should re-evaluate your database design.

Answer 2

you need to create trigger on insert row in Branch_TB table.
In trigger you need to add code for Add column in require table.
How to create Trigger in Sql ? check this.

Answer 3

I understand it like you want to duplicate inserted value in some other table in column name. If this is true then you can try with OUTPUT:
INSERT INTO Branch_TB( Branch_Id, Branch_Name )
OUTPUT 'someValue1', Inserted.Branch_Name, 'someValue2'
INTO Branch_City ( someCol1, Name, comeCol2 )
VALUES ( 1, 'some name' )

Answer 4

you can try this
create proc proc_branch (#b_name varchar(50)
as
begin
exec('alter table Branch_city add column '+ #b_name + ';');
end
go
create trigger tr_branch
on branch_TB
for insert
as
begin
declare #branch_name varchar(50);
set #branch_name=(select branch_name from inserted)
exec proc proc_branch
end