how do i ignore rows with first filed NULL

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LEARN ABOUT REDHAT

drop_table

DROP 
TABLE(7)							   SQL Commands 						     DROP TABLE(7)

NAME

       DROP TABLE - remove a table

SYNOPSIS

       DROP TABLE name [, ...] [ CASCADE | RESTRICT ]

   INPUTS
       name   The name (optionally schema-qualified) of an existing table to drop.

       CASCADE
	      Automatically drop objects that depend on the table (such as views).

       RESTRICT
	      Refuse to drop the table if there are any dependent objects.  This is the default.

   OUTPUTS
       DROP TABLE
	      The message returned if the command completes successfully.

       ERROR: table "name" does not exist
	      If the specified table does not exist in the database.

DESCRIPTION

       DROP  TABLE  removes  tables  from the database.  Only its owner may destroy a table. A table may be emptied of rows, but not destroyed, by
       using DELETE.

       DROP TABLE always removes any indexes, rules, triggers, and constraints that exist for the target table. However, to drop a table  that	is
       referenced  by  a  foreign-key constraint of another table, CASCADE must be specified. (CASCADE will remove the foreign-key constraint, not
       the other table itself.)

   NOTES
       Refer to CREATE TABLE and ALTER TABLE for information on how to create or modify tables.

USAGE

       To destroy two tables, films and distributors:

       DROP TABLE films, distributors;

COMPATIBILITY

   SQL92
SQL - Language Statements					    2002-11-22							     DROP TABLE(7)

Shell Programming and Scripting