CLEAR
CL[EAR] {BRE[AKS] | BUFF[ER] | COL[UMNS] | COMP[UTES] | SCR[EEN] | SQL | TIMI[NG]}
The CLEAR command allows you to easily delete all column definitions, break settings, compute definitions, and so forth. For example:
CLEAR BREAKS CLEAR COMPUTES
Deletes any break setting you may have defined using the BREAK command.
Erases the contents of the buffer.
Deletes any column definitions you may have made using the COLUMN command.
Deletes any computations you may have defined using the COMPUTE command.
Clears the screen.
Erases the contents of the SQL buffer.
Deletes any timers you may have created using the TIMING command.