'Execute dynamic query in stored prouder oracle Rdb

I want to execute one dynamic update query in oracle rdb through stored procedure.

For example:

Set :updateString='Update table set colum1, column2':

I want to execute :updateString in procedure only.

I have tried below cmds

Exec :updateString
execute :updateString, 
exec sql :updateString

and so on but nothing is working in oracle rdb sql terminal.

I am using Oracle Rdb (a relational database management system for the OpenVMS operating system). Version is Oracle Rdb SQL On Openvms Release 7.4.1.0.0



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