For finding the table:

Select * from Tabs; (Tabs means Table)

For describing the table:

Describe dept;(dept is table name)

Or

Desc dept;

Set line 10 Means:

1………10 lines. line  work horizontally

Set pagesize  5 means:

1

.

.

.

5

After 5 lines it shows the heading. Pagesize work vertically.

/

(/ it is used to previous data show)

Edit  

(Edit Work on notefile)

Or

ED

Save D:\EMP.SQL (It works to save the query on pc/desktop)

@D:\EMP.SQL ( It works for save file run)

Clear screen (it used to screen clear)

Spool D:\2021.sql (save the whole work, it runs early work)

Passw  scott(user) (For use password change)

Select * from emp where deptno=&deptno;

Enter a value for:

(& use for data)

Ed login (It saves the data on screen)

 Copy (CMD file goto property and select the quick edit mode and insert mode)