Oracle CREATE DATABASE table if this table exists then delete and rebuild __python

Instance:
To create a userinfo database table:

Of course you can write this:
drop table USERINFO
CREATE TABLE USERINFO
(
Englishname varchar (30),
Chinesename varchar (30),
Sex varchar (10),
Age int,
Birthplace varchar (100),
Birthdate date Default Sysdate
)
But there is one problem:
If UserInfo does not exist before, drop table userinfo is meaningless, here is less an if judgment, OK, look at the positive solution:

Declare
W_count int;
W_name varchar (20);
Begin
W_name: = ' USERINFO ';
Select COUNT (*) into the w_count from user_tables where table_name = w_name;
if (w_count>0) then
Execute immediate ' drop table USERINFO ';
End If;
Execute immediate ' CREATE TABLE USERINFO
(
Englishname varchar (30),
Chinesename varchar (30),
Sex varchar (10),
Age int,
Birthplace varchar (100),
Birthdate date Default Sysdate
)';
End


Save for Userinfo.msql execution on it, of course you can also have other executable ways.