help!

<p>how to migrate sql from MS sql server to postgresql?<p>i'd like to tranfer sql schema from MS server<br
/>Example:<br/>*******************1*********************************<br />if exists (select * from sysobjects <br
/>whereid = object_id(N'[admin].[test]') and <br />OBJECTPROPERTY(id, N'IsUserTable') = 1)<br />drop table
[admin].[test]<br />go<br />*******************2*********************************<br />CREATE TABLE [admin].[test] (<br
/>[test_name][char] (50) NOT NULL ,<br />[test_value] [int] NOT NULL <br />)<br /><br />   i can only realize part 2. i
don'tknow how to realize part 1.in other words,<p>i want to know how to check if a table exist in
postgresql<p>*******************2*********************************<br/>  create table test(<br />   test_name char (50)
notnull,<br />   test_value int not null<br />  )<p><br />thanks for any advice!!<br />