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SQL> desc test;
名称 是否为空? 类型
--------------------- -------- ---------------
ID NOT NULL NUMBER(8)
USERNAME VARCHAR2(32)
PASSWORD VARCHAR2(32)
AGE NUMBER(3)
BIRTHDAY DATE
ADDRESS VARCHAR2(40)
SQL> select count(*) from test;
COUNT(*)
----------
5000001
SQL> select * from test where rownum <10;
ID USERNAME PASSWORD AGE BIRTHDAY ADDRESS
---------- ---------------------- ------------------------------ ---------
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