uAbout 90% of dynamic SQL is covered by a single command (with variations):
u
udeclare
u v_variable_tx
varchar2(32000);
ubegin
u v_variable_tx:='whatever_you_want';
u EXECUTE IMMEDIATE v_variable_tx;
uend;
u OR
ubegin
u EXECUTE IMMEDIATE 'whatever_you_want';
uend;