plsql - Oracle dual query -

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I have a query: 

  SELECT XY ('p1', 'p2 doubles From

I know that's double but this part is XY ('p1', 'p2', 'p3', 'p3', 'p4', '100') ',' P4 ',' 100 ') Actually I'm surprised that X and Y are tables or what?

OK, I can see three possibilities:

  1. X one There is a schema, and there is a function within the Y-X schema.
  2. X is a package, either with a public pattern or in the current schema, and Y is the function defined in that package.
  3. X is a type, either with a public pattern or currently schema, and Y is a function defined in a type.

SQL * plus command DESCRIBE X or DESCRIBE XY What does the return?


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