manipulate array of data in SQL

As we know, SQL server lacks of concept of array. 

a workaround is to store the data in a table variable and then iterate it.

one way to do iterate is using cursor, but it's slow

another way is add a id column in the table variable, and then access the record in table variable with index.

DECLARE @UserName VARCHAR(30), @DisplayName VARCHAR(30)

DECLARE @Users TABLE(Id int identity(1,1), UserName VARCHAR(30), DisplayName VARCHAR(30))

INSERT INTO @Users

VALUES

('lxing', 'Lili')

,('ashan', 'Allen')

DECLARE @RowsToProcess  int = @@ROWCOUNT

DECLARE @Row INT=1

WHILE(@Row <= @RowsToProcess)

BEGIN

SELECT @UserName = UserName, @DisplayName = DisplayName FROM @Users where Id = @Row

declare @uid int

--insert user

SET @Row = @Row + 1

END