SQL Commands with Legacy ERP Systems
Two areas to pay close attention to when writing SQL statements
Sometimes custom processes need to be written in order to pull data from legacy ERP System. But many times legacy system have the ability to support ODBC connections making it relatively easy to create simple SQL statements in the outbound file definitions to meet the EDI needs. An additional benefit is that if any data needs to be added in the future, complex coding is not required.
Know your data types. This holds true for legacy and non-legacy systems alike. Specifically, date formats and data types are not stored the same way in the database as they appear in the application. For example, if a date on the screen of your application is MM-DD-CCYY your application database may actually store the data in the format of CCYYMMDD. The later format is what you will have to use when writing your SQL statement.
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