Hi friend i have small doubts in sql server plz give answers

suppose iload data from one table to another table .that time data load incorrectly.why data come incorrectly .table 1 columns like id,name,sal and table 2 also same id,name,sal. table1 data like

id,name,sal
12,dfg,1200
13,ueno,560
15,tend,9850

actually table 2 data is empty before loading data when ever i load table 1 data into table 2 that time . table 2 data like

id,name,sal
? ,?    ,?
? , ?    ,?
? ,  ?   , ?

why its occured .is there any reasion. what mistakes i done.plz tell me why its come likde this way.

Submitted under: Microsoft SQL Server · TSQL ·  ·  ·