111. 返回大于等于N的最小整數(shù)值? SELECT CEIL(N) FROM DUAL; 112. 返回小于等于N的最小整數(shù)值? SELECT FLOOR(N) FROM DUAL; 113. 返回當(dāng)前月的最后一天? SELECT LAST_DAY(SYSDATE) FROM DUAL; 114. 如何不同用戶間數(shù)據(jù)導(dǎo)入? IMP SYSTEM/MANAGER FILE=AA.DMP FROMUSER=USER_OLD TOUSER=USER_NEW ROWS=Y INDEXES=Y ;
115. 如何找數(shù)據(jù)庫表的主鍵字段的名稱? SQL>SELECT * FROM user_constraints WHERE CONSTRAINT_TYPE='P' and table_name='TABLE_NAME'; 116. 兩個結(jié)果集互加的函數(shù)? 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. 兩個結(jié)果集互減的函數(shù)? 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; 建表時: create table cust { cust_id smallint not null, ...} insert 時: insert into table cust values( seq_cust.nextval, ...) 119>.日期的各部分的常用的的寫法 取時間點的年份的寫法:SELECT TO_CHAR(SYSDATE,'YYYY') FROM DUAL; 120>.取時間點的月份的寫法:SELECT TO_CHAR(SYSDATE,'MM') FROM DUAL;
