Create if-not-exists.sql

Author: uschwinn

data-platform/core-converged-db/database-23c/23c-basic-examples/if-not-exists.sql

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+REM Script in 23c: if-not-exists.sql
+
+-- suppose table DEPT exists
+desc dept
+
+-- try several times, no error occurs
+create table if not exists scott.dept (deptno number, dname varchar2(10), loc varchar2(15));
+
+-- create a helper table
+create table dept1 as select * from dept;
+
+-- drop several times, no error occurs
+drop table if exists dept1;