Fix PII lab persona tests

scenarios/03-pii-row-column-cell/sql/00_schema.sql

@@ -1,13 +1,22 @@
 WHENEVER SQLERROR EXIT SQL.SQLCODE
 
-CREATE TABLE dds_employees (
-  employee_id NUMBER PRIMARY KEY,
-  first_name  VARCHAR2(50) NOT NULL,
-  last_name   VARCHAR2(50) NOT NULL,
-  email       VARCHAR2(80) NOT NULL,
-  manager     VARCHAR2(80),
-  ssn         VARCHAR2(30),
-  salary      NUMBER(12,2),
-  phone       VARCHAR2(30)
-);
-
+BEGIN
+  EXECUTE IMMEDIATE q'[
+    CREATE TABLE dds_employees (
+      employee_id NUMBER PRIMARY KEY,
+      first_name  VARCHAR2(50) NOT NULL,
+      last_name   VARCHAR2(50) NOT NULL,
+      email       VARCHAR2(80) NOT NULL,
+      manager     VARCHAR2(80),
+      ssn         VARCHAR2(30),
+      salary      NUMBER(12,2),
+      phone       VARCHAR2(30)
+    )
+  ]';
+EXCEPTION
+  WHEN OTHERS THEN
+    IF SQLCODE != -955 THEN
+      RAISE;
+    END IF;
+END;
+/