摘要:
--范例1 select 10 deptno_case10, (select distinct case deptno when 10 then listagg(empno, ',') within group(order by ename) else null end deptno from em 阅读全文
摘要:
[root@Oracle11g ~]# fdisk -l Disk /dev/sda: 21.4 GB, 21474836480 bytes255 heads, 63 sectors/track, 2610 cylindersUnits = cylinders of 16065 * 512 = 82 阅读全文