oracle 数据库 sql语言 数组和表join的方法
发布网友
发布时间：2022-04-21 03:21
共2个回答
懂视网
时间：2022-04-10 22:47
1、建表语句
CREATE TABLE Websites(
ID INT PRIMARY KEY,
NAME VARCHAR2(30),
URL VARCHAR2(100),
alexa INT,
country VARCHAR2(30)
);
INSERT INTO Websites(ID,NAME,URL,alexa,country)VALUES(1,‘Google‘,‘http://www.google.com/‘,1,‘USA‘);
INSERT INTO Websites(ID,NAME,URL,alexa,country)VALUES(2,‘淘宝‘,‘http://www.taobao.com/‘,13,‘CN‘);
INSERT INTO Websites(ID,NAME,URL,alexa,country)VALUES(3,‘天猫‘,‘http://www.tianmao.com/‘,16,‘CN‘);
INSERT INTO Websites(ID,NAME,URL,alexa,country)VALUES(4,‘微博‘,‘http://www.weibo.com/‘,20,‘CN‘);
INSERT INTO Websites(ID,NAME,URL,alexa,country)VALUES(5,‘Facebook‘,‘http://www.facebook.com/‘,3,‘USA‘);
INSERT INTO Websites(ID,NAME,URL,alexa,country)VALUES(7,‘stackoverflow‘,‘http://www.stackoverflow.com/‘,0,‘IND‘);
CREATE TABLE access_log(
aid INT PRIMARY KEY,
site_id INT,
COUNT INT,
datetime date
);
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(1,1,45,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(2,3,100,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(3,1,230,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(4,2,10,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(5,5,205,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(6,4,13,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(7,3,220,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(8,5,545,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
INSERT INTO access_log(aid,site_id,COUNT,datetime)VALUES(9,3,201,to_timestamp(to_char(systimestamp,‘YYYY-MM-DD HH24:MI:SS.FF‘),‘YYYY-MM-DD HH24:MI:SS.FF‘));
SELECT * FROM Websites;
SELECT * FROM access_log;
2、
Oracle-Join
标签：int sys tab into ace arc 天猫 try websites
热心网友
时间：2022-04-10 19:55
PL/SQL表---table()函数用法
/*
PL/SQL表---table()函数用法：
利用table()函数，我们可以将PL/SQL返回的结果集代替table。
oracle内存表在查询和报表的时候用的比较多，它的速度相对物理表要快几十倍。
simple example：
1、table()结合数组：
*/
create or replace type t_test as object(
id integer,
rq date,
mc varchar2(60)
);
create or replace type t_test_table as table of t_test;
create or replace function f_test_array(n in number default null) return t_test_table
as
v_test t_test_table := t_test_table();
begin
for i in 1 .. nvl(n,100) loop
v_test.extend();
v_test(v_test.count) := t_test(i,sysdate,'mc'||i);
end loop;
return v_test;
end f_test_array;
/
select * from table(f_test_array(10));
select * from the(select f_test_array(10) from al);
/*
2、table()结合PIPELINED函数：
*/
create or replace function f_test_pipe(n in number default null) return t_test_table PIPELINED
as
v_test t_test_table := t_test_table();
begin
for i in 1 .. nvl(n,100) loop
pipe row(t_test(i,sysdate,'mc'||i));
end loop;
return;
end f_test_pipe;
/
select * from table(f_test_pipe(20));
select * from the(select f_test_pipe(20) from al);
/*
3、table()结合系统包：
*/
create table test (id varchar2(20));
insert into test values('1');
commit;
explain plan for select * from test;
select * from table(dbms_xplan.display);
PL/SQL表---table()函数用法
/*
PL/SQL表---table()函数用法：
利用table()函数，我们可以将PL/SQL返回的结果集代替table。
oracle内存表在查询和报表的时候用的比较多，它的速度相对物理表要快几十倍。
simple example：
1、table()结合数组：
*/
create or replace type t_test as object(
id integer,
rq date,
mc varchar2(60)
);
create or replace type t_test_table as table of t_test;
create or replace function f_test_array(n in number default null) return t_test_table
as
v_test t_test_table := t_test_table();
begin
for i in 1 .. nvl(n,100) loop
v_test.extend();
v_test(v_test.count) := t_test(i,sysdate,'mc'||i);
end loop;
return v_test;
end f_test_array;
/
select * from table(f_test_array(10));
select * from the(select f_test_array(10) from al);
/*
2、table()结合PIPELINED函数：
*/
create or replace function f_test_pipe(n in number default null) return t_test_table PIPELINED
as
v_test t_test_table := t_test_table();
begin
for i in 1 .. nvl(n,100) loop
pipe row(t_test(i,sysdate,'mc'||i));
end loop;
return;
end f_test_pipe;
/
select * from table(f_test_pipe(20));
select * from the(select f_test_pipe(20) from al);
/*
3、table()结合系统包：
*/
create table test (id varchar2(20));
insert into test values('1');
commit;
explain plan for select * from test;
select * from table(dbms_xplan.display);
