oracle Óαê
oracle Óαê
¹Ø¼ü×Ö: oracle Óαê
1. Óαê: ÈÝÆ÷£¬´æ´¢SQLÓï¾äÓ°ÏìÐÐÊý¡£
2. ÓαêÀàÐÍ: ÒþʽÓα꣬ÏÔʾÓα꣬REFÓαꡣÆäÖУ¬ÒþʽÓαêºÍÏÔʾÓαêÊôÓÚ¾²Ì¬Óα꣨ÔËÐÐǰ½«ÓαêÓëSQLÓï¾ä¹ØÁª£©,REFÓαêÊôÓÚ¶¯Ì¬Óαê(ÔËÐÐʱ½«ÓαêÓëSQLÓï¾ä¹ØÁª)¡£
3. ÒþʽÓαê: DMLÓï¾ä¶ÔÓ¦µÄÓα꣬ÓÉOracle×Ô¶¯¹ÜÀí£¬Ò²³ÆSQLÓαꡣ£¨ËùÓеÄDML²Ù×÷¶¼±»OracleÄÚ²¿½âÎöΪһ¸öcursorÃûΪSQLµÄÒþʽÓα꣩
q ÒþʽÓαêµÄÊôÐÔÓУº
q %FOUND – SQL Óï¾äÓ°ÏìÁËÒ»Ðлò¶àÐÐʱΪ TRUE
q %NOTFOUND – SQL Óï¾äûÓÐÓ°ÏìÈκÎÐÐʱΪTRUE
q %ROWCOUNT – SQL Óï¾äÓ°ÏìµÄÐÐÊý
q %ISOPEN - ÓαêÊÇ·ñ´ò¿ª£¬Ê¼ÖÕΪFALSE
¾ÙÀý˵Ã÷£º
Sql´úÂë
declare
v_empno emp.empno %type:=7000;
begin
update emp set ename='fxe' where empno=v_empno;
if SQl%found then
dbms_output.put_line(SQL%rowcount||'Delete Ok!');
end if;
if SQL%notfound then -- Ò»ÌõSQL¾Í±íʾÊÇÒ»¸öÒþʽÓαê
dbms_output.put_line('¹ÍÔ±±àºÅ'||v_empno||'²»´æÔÚ');
end if;
end;
declare
v_empno emp.empno %type:=7000;
begin
update emp set ename='fxe' where empno=v_empno;
if SQl%found then
dbms_output.put_line(SQL%rowcount||'Delete Ok!');
end if;
if SQL%notfound then -- Ò»ÌõSQL¾Í±íʾÊÇÒ»¸öÒþʽÓαê
dbms_output.put_line('¹ÍÔ±±àºÅ'||v_empno||'²»´æÔÚ');
end if;
end;
4. ÏÔʾÓαê
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1. Which statements are true? (Choose all that apply.)
A. The data dictionary is created and maintained by the database administrator.
B. The data dictionary views can consist of joins of dictiona ......
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1. inner join / left join/ right join / full join
select a.dname, b.ename from dept a, emp b where a.deptno=b.deptno and a.deptno=10;
select a.dname, b.ename from dept a inner join emp b
on a.deptno=b.deptno and a.deptno=10;
select dname,ename from dept natural ......
IP µØÖ·×öÈçÏÂÐ޸ģº
Public IP 10.85.10.119/121 -- > 10.85.10.219/221
Privite IP 192.168.1.119/121 -- > 192.168.1.219/221
Virtual IP 10.85.10.122/123 -- ......
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