!3 Query Stats 

|Query Stats|
|query|row count?|is empty?|
|SELECT ROWNUM*5 n FROM ( SELECT 1 FROM dual CONNECT BY LEVEL <= 5 )|5|false|


!|Query Stats|
|query | row count? |is empty?|
| SELECT * from dual where 0=1 |0|true|

!|Query Stats|
|table name| row count? |is empty?|
| dual |1|false|


!|Query Stats|
|table name| where|row count? |is empty?|
| dual |1=0|0|true|
