如何存储 ORACLE sql 查询的结果集？答案

【问题标题】：How to store a result set of a ORACLE sql query?如何存储 ORACLE sql 查询的结果集？
【发布时间】：2016-08-03 11:28:43
【问题描述】：

示例：有一个表“ID_NAME”，其中有一列“ID”，其中包含 2000 个条目，例如 1,2,3.. 2000。我有一个问题

从 ID_NAME 中选择 id，其中 id

> Result :  1 2 3 4 . .1000

我的 PL SQL 块是这样的，

 SET SERVEROUTPUT ON;
    declare
    var1 number;
    var2 number;
    var3 number;
    var4 number;
    var5 number;
    var6 number;
    var7 number;
    var8 number;
    var9 number;
    var10 number;
    begin
    with set1 as (select id from ID_NAME where id < 1001)
    select count(*) into var1 from table1 where id in (select * from set1);
    select count(*) into var2 from table2 where id in (select * from set1);
    select count(*) into var3 from table3 where id in (select * from set1);
    select count(*) into var4 from table4 where id in (select * from set1);
    select count(*) into var5 from table5 where id in (select * from set1);
    select count(*) into var6 from table6 where id in (select * from set1);
    select count(*) into var7 from table7 where id in (select * from set1);
    select count(*) into var8 from table8 where id in (select * from set1);
    select count(*) into var9 from table9 where id in (select * from set1);
    select count(*) into var10 from table10 where id in (select * from set1);
DBMS_OUTPUT.PUT_LINE('var1,var2,var3,var4,var5,var6,var7,var8,var9,var10');
DBMS_OUTPUT.PUT_LINE(var1||','||var2||','||var3||','||var4||','||var5||','||var6||','||var7||','||var8||','||var9||','||var10);
end;

但我得到了

PL/SQL: ORA-00942: 表或视图不存在

在我的 sql 开发人员中。

我想使用下面查询中的 SET1，这样我就不必在 count(*) 子查询中一次又一次地运行它

with set1 as (select id from ID_NAME where id < 1001)

【问题讨论】：

标签： oracle plsql oracle11g

【解决方案1】：

SET SERVEROUTPUT ON;
    declare
    var1 number;
    var2 number;
    var3 number;
    var4 number;
    var5 number;
    var6 number;
    var7 number;
    var8 number;
    var9 number;
    var10 number;
    begin
    with set1 as (select id from ID_NAME where id < 1001)
    select 
    (select count(*) from table1 where id in (select * from set1)),
    (select count(*) from table2 where id in (select * from set1)),
    ..............
    (select count(*) from table9 where id in (select * from set1)),
    (select count(*) from table10 where id in (select * from set1))
    into var1,var2,.....,var9,var10
    from dual;
DBMS_OUTPUT.PUT_LINE('var1,var2,var3,var4,var5,var6,var7,var8,var9,var10');
DBMS_OUTPUT.PUT_LINE(var1||','||var2||','||var3||','||var4||','||var5||','||var6||','||var7||','||var8||','||var9||','||var10);
end;

【讨论】：

【解决方案2】：

您正在构建一个 CTE，所以它是这样的：对于每个 select 语句，您需要加入 CTE。

   declare
    var1 number;
    var2 number;
    var3 number;
    var4 number;
    var5 number;
    var6 number;
    var7 number;
    var8 number;
    var9 number;
    var10 number;
    begin
    with set1 as (select emp_id from employee where emp_id < 1001)
    select count(*) into var1 from employee 
    where emp_id in (select eno from emp_sal);

    with set1 as (select emp_id from employee where emp_id < 1001)
    select count(*) into var2 from employee 
    where emp_id in (select eno from emp_sal);


    .
    .
    .
    . 
    and so on
--    select count(*) into var2 from table2 where id in (select * from set1);
--    select count(*) into var3 from table3 where id in (select * from set1);
--    select count(*) into var4 from table4 where id in (select * from set1);
--    select count(*) into var5 from table5 where id in (select * from set1);
--    select count(*) into var6 from table6 where id in (select * from set1);
--    select count(*) into var7 from table7 where id in (select * from set1);
--    select count(*) into var8 from table8 where id in (select * from set1);
--    select count(*) into var9 from table9 where id in (select * from set1);
--    select count(*) into var10 from table10 where id in (select * from set1);
DBMS_OUTPUT.PUT_LINE('var1,var2,var3,var4,var5,var6,var7,var8,var9,var10');
DBMS_OUTPUT.PUT_LINE(var1||','||var2||','||var3||','||var4||','||var5||','||var6||','||var7||','||var8||','||var9||','||var10);
end;

【讨论】：

【解决方案3】：

在 SQL 中，with 子句或公用表表达式是查询的一部分。它没有设置程序变量。

with xyz as (select blah from blahblah where something = somethingelse)
select blah from xyz;

您不能在其他查询中引用xyz - 它只是单个查询中的一个子句。

【讨论】：