oracle且如何写,oracle怎么写sql语句
oracle中 大于0整数，且不能为空 应该怎么写
create table t(test number not null check(test 10))
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如果表已建好、
alter table t
alter column test number not null
然后
alter table t
add constraint check_t check (test0)
oracle同步数据，两张表结构相同且分布在不同数据库，具体场景如下，如何写SQL语句？
异构数据库的话，用db_link 和 Merge 吧
语法如下 :
MERGE INTO [your table-name] [rename your table here]
USING ( [write your query here] )[rename your query-sql and using just like a table]
ON ([conditional expression here] AND [...]...)
WHEN MATHED THEN [here you can execute some update sql or something else ]
WHEN NOT MATHED THEN [execute something else here ! ]
大概如下：
merge into B.a@db_link_name t2 using A.a t1 on (t1.xxxx = t2.xxxx)
when not matched then
insert values(t1.xxxx, t1.yyy, t1.zzz) l
oracle存储过程并且怎么写
存储过程(procedure)：是一个命名了的语句块，可以有0个或多个参数
语法：
create or replace procedure HelloWorld
as
begin
dbms_output.put_line('HelloWorld');
end;
调用存储过程
* 命令调用 exec helloworld
* 语句块调用
begin
helloworld;
end;
/
DELETE:
create or replace procedure del_emp01
is
begin
delete from emp01 where empno=7369;
end;
exec del_emp01;
create or replace procedure del_emp01(v_empno in emp01.empno%type)
is
begin
delete from emp01 wherer empno=v_empno;
end;
exec del_emp01(7521);
INSERT
create or replace procedure ins_emp01
(v_empno emp01.empno%type,v_ename emp01.ename%type)
as
begin
insert into emp01(empno,ename) values(v_empno,v_ename);
end;
exec ins_emp01(1000,'李四');
UPDATE
create or replace procedure upd_emp01
(v_empno emp01.empno%type,v_ename emp01.ename%type)
as
begin
update emp01 set ename=v_ename where empno=v_empno;
end;
exec upd_emp01(1000,'张三');
SELECT
create or replace procedure sel_emp01
(v_empno emp01.empno%type,v_emp01_data out emp01%rowtype)
as
begin
select * into v_emp01_data from emp where empno=v_empno;
end;
带有输出参数的存储过程不能使用命令直接调用
只能由语句块或程序调用(JAVA) ****************************************************************
declare
v_emp_data emp01%rowtype;
begin
sel_emp01(7499,v_emp_data);
dbms_output.put_line(v_emp_data.ename||' '||v_emp_data.sal);
end;
调用：
declare
v_emp_data emp01%rowtype;
begin
sel_emp01(7499,v_emp_data);
dbms_output.put_line(v_emp_data.ename||' '||v_emp_data.sal);
end;
使用scott用户登录
统计某个部门的员工的工资总和，员工的人数，平均工资，创建存储过程
create or replace procedure deptcount
(v_deptno emp.deptno%type,v_sal_sum out number,v_recordes out number,v_avg_sal out number,errorMsg out varchar2)
is
begin
select sum(sal) into v_sal_sum from emp group by deptno having deptno=v_deptno;
select count(*) into v_recordes from emp group by deptno having deptno=v_deptno;
select avg(sal) into v_avg_sal from emp group by deptno having deptno=v_deptno;
exception
when no_data_found then
errorMsg:='没有该部门';
end;
调用：
declare
v_sal_sum number;
v_recordes number;
v_avg_sal number(8,2);
v_errormsg varchar2(20);
begin
deptcount(90,v_sal_sum,v_recordes,v_avg_sal,v_errormsg);
dbms_output.put_line(v_sal_sum||' '||v_recordes||' '||v_avg_sal);
dbms_output.put_line(v_errormsg);
end;
//输出参数
create or replace procedure my_pro(v_num in number,v_result out number)
is
v_temp number;
begin
v_temp:=0;
for i in 1..v_num
loop
v_temp:=v_temp+i;
end loop;
v_result:=v_temp;
end;
declare
v_recieve number;
begin
my_pro(100,v_recieve);
dbms_output.put_line(v_recieve);
end;
//既是输入参数又是输出参数
create or replace procedure my_pro1(v_i in out number)
is
v_j number;
begin
v_j:=30;
v_i:=v_i*v_j;
end;
declare
v_t number;
begin
v_t:=20;
my_pro1(v_t);
dbms_output.put_line(v_t);
end;
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