How to convert existing Sql server database to postgre database?

How to convert existing Sql server database to postgre database?
Yogendra SahuSoftware DeveloperAsked:
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nociSoftware EngineerCommented:
1) get a description of all current tables
2) determine the order in which tables need to be processes; First all tables that don't refer to other tables,
   Then tables that refer to already existing tables from previous step
     and repeat this until all tables are specified.
3) create the data description for each of the tables for the Postgresql database (and take a note which conversions need to be done);
4) create a script that connectes to both databases and copies all data (in the table order determined in step 2) with the conversion rules determined in step 3
5) test the script built in step 4 on a separate database copy, if there are errors recheck/redo step 3 & step 4.  
6) convert the production database to production postgresql, in case of errors what went differently wrong compared to step 5, redo step 3-5.....

(use a copy of production data to not block any transaction there).
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