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Most SQL database implementations extend their SQL capabilities by providing imperative, i.e. Examples of these are Oracle's PL/SQL and DB2's SQL_PL.Data manipulation languages tend to have many different flavors and capabilities between database vendors.PL/SQL is a block structured language that can have multiple blocks in it.
A nested table is quite similar to a with the exception that the order of the elements is not static.In SQL these two categories are similar in their detailed syntax, data types, expressions etc., but distinct in their overall function.and so is considered by the standard to be outside of DML. INTO form is considered to be DML because it manipulates (i.e. In common practice though, this distinction is not made and SELECT is widely considered to be part of DML.These composite variables have internal components that you can treat as individual variables.You can pass composite variables to subprograms as a parameters.