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Peter - this is the forum for Oracle Designer. There is a forum devoted to SQL and PL/SQL at PL/SQL but that would be the place to ask questions that are more specific than yours. There are several excellent books about PL/SQL - check your local library or bookstore (brick and mortar or web). You will certainly run into Paul Dorsey's PL/SQL for Dummies and several books by Steven Feuerstein. A Google or Bing search will find you several web sites devoted to PL/SQL. Do your homework. Then, if you have questions, ask in forum 75.