SQL> SELECT 'error detail : ' || &ERROR_DETAIL from dual;
Enter value for error_detail: 'the field x.y is mandatory'
old 1: SELECT 'error detail : ' || &ERROR_DETAIL from dual
new 1: SELECT 'error detail : ' || 'the field x.y is mandatory' from dual
'ERRORDETAIL:'||'THEFIELDX.YISMANDATORY'
-----------------------------------------
error detail : the field x.y is mandatory
SQL>
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