显示用户表中存在的多个表

Question

我们必须显示user_tables中所有表中的数据。我的代码是

DECLARE
name varchar2(50);
s_query varchar2(500);
cursor c_demo is select table_name from    user_tables;
BEGIN
open c_demo;
loop
fetch c_demo into name;
EXIT WHEN c_demo%notfound;
select * into s_query from @name; 
dbms_output.put_line(s_query);
end loop;
close c_demo;
end;

但它显示错误表缺少

Answer 1

您可以像这样执行动态SQL：

1.定义var

     sql_stmt  VARCHAR2(200);

1. 构建查询

    sql_stmt := 'select * from '||name; 
   

2. Exceute Statement：

   for r in sql_stmt
   loop
   //perfom operation on data
   
   end loop;