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The best way of writing SQL select query in SQL to avoid ambiguous column issue. Mostly people confuse with alias concept. This SQL query using alias in SELECT is beneficial to apply in your current project.
CLIST is an interpreted language. CLISTs can be run in background (by running JCL which executes the TSO control program (IKJEFT01)). Read more with examples.
This is one of the best way to enter into digital career. Even you have been working in legacy technologies. Read more.