ORACLE问题,每天10问(十二)

发表于:2007-07-02来源:作者:点击数: 标签:
111. 返回大于等于N的最小整数值? SELECT CEIL(N) FROM DUAL; 112. 返回小于等于N的最小整数值? SELECT FLOOR(N) FROM DUAL; 113. 返回当前月的最后一天? SELECT LAST_DAY(SYSDATE) FROM DUAL; 114. 如何不同用户间数据导入? IMP SYSTEM/MANAGER FILE=AA.DMP

111. 返回大于等于N的最小整数值?  SELECT CEIL(N) FROM DUAL;  112. 返回小于等于N的最小整数值?  SELECT FLOOR(N) FROM DUAL;  113. 返回当前月的最后一天?  SELECT LAST_DAY(SYSDATE) FROM DUAL;  114. 如何不同用户间数据导入?  IMP SYSTEM/MANAGER FILE=AA.DMP FROMUSER=USER_OLD TOUSER=USER_NEW ROWS=Y INDEXES=Y ;

       115. 如何找数据库表的主键字段的名称?  SQL>SELECT * FROM user_constraints WHERE CONSTRAINT_TYPE=@#P@# and table_name=@#TABLE_NAME@#;  116. 两个结果集互加的函数?  SQL>SELECT * FROM BSEMPMS_OLD INTERSECT SELECT * FROM BSEMPMS_NEW;  SQL>SELECT * FROM BSEMPMS_OLD UNION SELECT * FROM BSEMPMS_NEW;  SQL>SELECT * FROM BSEMPMS_OLD UNION ALL SELECT * FROM BSEMPMS_NEW;  117. 两个结果集互减的函数?  SQL>SELECT * FROM BSEMPMS_OLD MINUS SELECT * FROM BSEMPMS_NEW;  118. 如何配置Sequence?  建sequence seq_custid   create sequence seq_custid start 1 incrememt by 1;   建表时: create table cust { cust_id smallint not null, ...} insert 时: insert into table cust values( seq_cust.nextval, ...)   119>.日期的各部分的常用的的写法  取时间点的年份的写法:SELECT TO_CHAR(SYSDATE,@#YYYY@#) FROM DUAL;  120>.取时间点的月份的写法:SELECT TO_CHAR(SYSDATE,@#MM@#) FROM DUAL;

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