不存在这样的问题 CREATE TABLE db2foribmi的功能。
有 CREATE OR REPLACE 但不是 CREATE IF NOT EXISTS .
请参阅文档中的create table语句说明。
但您可以使用动态复合语句。

-- Use some another statement terminator in your tool you run this statement from like "@" as below
-- Or don't use this statement terminator at all, if you run the statement from some external program
BEGIN
  IF NOT EXISTS
  (
  SELECT 1 
  FROM QSYS2.SYSTABLES
  WHERE TABLE_SCHEMA='PWRNTCDT' AND TABLE_NAME='CUSTOMER_CONTACTS'
  ) THEN

  CREATE TABLE PWRNTCDT.customers_contacts
  (
  customer_id varchar(10) NOT NULL DEFAULT '',
  contact_index INT NOT NULL,
  is_primary SMALLINT NOT NULL,
  f_name varchar(40) DEFAULT NULL,
  l_name varchar(40) DEFAULT NULL,
  job_title varchar(60) DEFAULT NULL,
  phone varchar(30) DEFAULT NULL,
  mobile varchar(30) DEFAULT NULL,
  email varchar(254) DEFAULT NULL
  );

  END IF;
END@