SQL Interview Questions/Two Columns into One Column: 7

 7.CONVERTING  TWO COLUMNS  INTO A  SINGLE COLUMN AND STORING IN A NEW TABLE

create table employee

(

id nvarchar(100),

id1 nvarchar(100))

insert into employee values('1','A'),('2','B'),('3','C')

select * from employee

  






select *  into E1 from (select id from employee union select id1 from employee)a where 1=1

select * from E1

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