This function generates random alphanumeric (with special characters) passwords of the length specified in the input.

Examples:

select utl_password.generate_random(20) from dual;

GZgu_Wf3aim_mCz_pDFy

select utl_password.generate_random(20) from dual connect by level <= 10;

ubr_Oybp__Jhppuiqhu_
rGDNFah7wJ7iwZm_ib_0
K_tlUz_2NfW_GJ58OC_V
X_h__r____FDsFXQ8kuX
p_WXf1_2B9_p6TeyiDWn
W_qzbw__bp___8sp_8tH
Own___z3Ax1sbTTh_x_x
CznriX___auTzEOxhszY
fa9_eppq9_gD6_9d1lmQ
WsgY__7abDmldFDDjL_w