of this clause to be 1%. By comparing this estimate and the actual
number of rows, we see that the estimate is very accurate
(in fact exact, as the table is very small). Changing the
- <literal>WHERE</> to use the <structfield>b</> column, an identical
- plan is generated. But observe what happens if we apply the same
+ <literal>WHERE</> condition to use the <structfield>b</> column, an
+ identical plan is generated. But observe what happens if we apply the same
condition on both columns, combining them with <literal>AND</>:
<programlisting>