The first two lines identify the table, giving the table name, the correlation name (if one was used in the query), a varno value that identifies the order of the table in the from clause, and the object ID for the table.
In the query, titles is specified using “t” as a correlation name, as in:
from titles t
The correlation name is included in the output only if a correlation name was used in the query. The correlation name is especially useful when you are trying to analyze the output from subqueries or queries doing self-joins on a table, such as:
from sysobjects o1, sysobjects o2
