select nvl2('', '1', '2') from dual;
select nullif(1, 2) from dual;
select rownum from dual;
select dump('啊啊', 1010) from dual;
select ascii('A') from dual;
select chr(65) from dual;
select xmlelement("a", 'b') from dual;
select xmlelement("item",
xmlattributes('1' as "attr_a",
nvl('' ,' ') as "attr_b",
'3' as "attr_c"),'a')
from dual;
select nullif(1, 2) from dual;
select rownum from dual;
select dump('啊啊', 1010) from dual;
select ascii('A') from dual;
select chr(65) from dual;
select xmlelement("a", 'b') from dual;
select xmlelement("item",
xmlattributes('1' as "attr_a",
nvl('' ,' ') as "attr_b",
'3' as "attr_c"),'a')
from dual;
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/25662223/viewspace-1433450/ ，如需转载，请注明出处，否则将追究法律责任。
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