DBMS_OUTPUT.put_line('请输入雇员编号:') ; v_eno := &empno ; -- 由键盘输入雇员编号 SELECT ename INTO v_ename FROM emp WHERE empno= v_eno ; DBMS_OUTPUT.put_line('编号为:' || v_eno || '雇员的名字为:'|| v_ename) ; END ; / 运行:输入empno的值:7369 输出结果:编号为:7369雇员...
JOIN dba_hist_sqltext b ON a.sql_id = b.sql_id JOIN dba_users c ON a.user_id = c.user_id WHERE a.sample_time BETWEEN SYSDATE - 3 AND SYSDATE AND b.command_type IN (7, 85) ORDER BY a.sample_time DESC;
Query optimizers are used in database management systems(DBMS) to create a compilation plan that is used by the execution engine of the DBMS to run a structured query language(SQL) like query. Compilation plans are built based on physical manifestation of logical operators and optimal join ...
CDISC standard undefined in define_header_metadata"; run; *** GET "TABLE OF CONTENTS" LEVEL DATASET METADATA; proc import out = toc_metadata datafile = "&path\&metadata" dbms=excelcs replace; sheet = "TOC_METADATA" ; run; *** GET THE VARIA...
Oracle already has a type "dbms_sql.varchar2_table" and I just have to declare an instance and use it, and you don't even have to specify a length. Also I have the alternative of creating my own type "TYPE array_cadena is table of varchar2(252) index by binary_integer" and instan...
*程序文件名;main.prg SETTALKOFF CLOSEALL CLEARALL mX="Visual FoxPro" mY="二级" DO s1 mY+mX RETURU *子程序文件名:s1.prg PROCEDURE s1 LOCAL mX mX="Visual FoxPro DBMS考试... 查看完整题目与答案 下列模式中,能够给出数据库物理存储结构与物理存取方法的是___。 A. 内模式 B. 外模式 C....