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Using Peek Function

Hi All,

Iam using Peek function to load the value of a column from particular table into variable .

The Column has more than 15 records, and I have used the below script 

Let vVar=Peek('ColumnName',9,'tblname');

Iam appending the row number manually such as 9 , 10 ,11 every time while assigning value to variable 

The code works fine for up-to 8 records but after that it shows null value in variable .I have checked the source table and there are more than 9 records present in the column.

Please let me know the reason and resolution for this 

Thank You !