select * from v$session (全部详细信息)
select username,count(username) from v$session where username is not null group by username (用户不为空的) select
阅读背景：
sql--查询数据库的连接数
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select * from v$session (全部详细信息)
select username,count(username) from v$session where username is not null group by username (用户不为空的) select
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