执行生成的sql语句（输出）

我想执行查询A，但我想使用查询B执行查询A。实现这一点的一种方法是将查询B的结果输出到sql文件并运行。我更愿意使用PL/SQL完成这项任务

--询问

--问题B

类似于

begin
  execute immediate 'delete from ta where id = ' || 4 ; 
end;
/

或者，如果要使用某个过程：

create or replace procedure delete_row ( row_ number )
as
begin
  execute immediate 'delete from ta where id = ' || row_ ; 
end;
/

begin
  delete_row( 4 );
end;
/

---

Dbfiddle.

您可以尝试

循环

查询B的语句，并在末尾应用

执行immediate

：

SQL> set serveroutput on;
SQL> declare
  v_sql varchar2(4000);
begin

  for c in ( select 'delete from ' as test from dual
              union all
              select 'tableA ' as test from dual
              union all
              select 'where ' as test from dual
              union all
              select 'id=4' as test from dual )   
  loop
    v_sql := v_sql || c.test;
  end loop;            
    dbms_output.put_line(v_sql);
    execute immediate v_sql;
end;
/

---

为什么不手动构建字符串，然后使用动态SQL执行它？您的问题是什么？如何编写外部查询，使用查询B作为子查询，其结果将是与查询a语句相等的字符串？这很简单-使用

listag（test，chr（10））

-但诀窍是在查询B中对四个成员的

UNION ALL

中的行进行排序。需要帮助吗？这就是你提问的原因吗？

create or replace procedure delete_row ( row_ number )
as
begin
  execute immediate 'delete from ta where id = ' || row_ ; 
end;
/

begin
  delete_row( 4 );
end;
/

SQL> set serveroutput on;
SQL> declare
  v_sql varchar2(4000);
begin

  for c in ( select 'delete from ' as test from dual
              union all
              select 'tableA ' as test from dual
              union all
              select 'where ' as test from dual
              union all
              select 'id=4' as test from dual )   
  loop
    v_sql := v_sql || c.test;
  end loop;            
    dbms_output.put_line(v_sql);
    execute immediate v_sql;
end;
/