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;
