问题描述
我必须从 3 个不同的查询(下面的 Q1、Q2 和 Q3)中获取 ID 值并将它们附加到一个 plsql 表中,以便我可以在以后使用 table() 时使用它。但我无法“附加”到表格中。你能告诉我怎么做吗?我在 Oracle 12G。我不想像在我的生产场景中那样联合所有查询,我需要从 15 个不同的查询中提取并且不想编写一个巨大的查询。并且每次,我“放入”到这个 plsql 表中,较早的数据都会被擦除并且看不到追加。知道如何使用 plsql 表来实现这一点吗?
CREATE OR replace PACKAGE pkg AS
TYPE customer_id_table_type IS TABLE OF all_customers.customer_id%TYPE;
PROCEDURE process_customers;
END pkg;
/
CREATE OR replace PACKAGE BODY pkg AS
PROCEDURE process_customers IS
customer_id_table customer_id_table_type := customer_id_table_type();
BEGIN
-- Q1
SELECT customer_id BULK COLLECT
INTO customer_id_table
FROM old_customers cust
WHERE cust.last_update_date BETWEEN SYSDATE - 100 AND SYSDATE;
-- Q2
SELECT customer_id BULK COLLECT
INTO customer_id_table
FROM new_customers cust
WHERE cust.last_update_date BETWEEN SYSDATE - 100 AND SYSDATE;
-- Q3
SELECT customer_id BULK COLLECT
INTO customer_id_table
FROM archive_customers cust
WHERE cust.last_update_date BETWEEN SYSDATE - 100 AND SYSDATE;
FOR rec IN
(
SELECT customer_info
FROM all_customers acc
WHERE customer_id IN (SELECT * FROM TABLE(customer_id_table)))
LOOP
dbms_output.put_line('customer info: '|| rec.customer_info);
END LOOP;
END process_customers;
END pkg;
/
解决方法
所以没有 BULK COLLECT APPEND
或任何东西,但您可以使用 MULTISET UNION
组合多个嵌套表。因此,您可以填充多个嵌套表,然后将它们组合起来。我不确定与单个 UNION
SQL 查询相比的性能如何,但我预计它会比循环中的任何操作都要好得多。
所以你会做这样的事情:
SELECT customer_id BULK COLLECT
INTO customer_id_table_1
FROM old_customers cust
WHERE cust.last_update_date BETWEEN SYSDATE - 100 AND SYSDATE;
SELECT customer_id BULK COLLECT
INTO customer_id_table_2
FROM new_customers cust
WHERE cust.last_update_date BETWEEN SYSDATE - 100 AND SYSDATE;
customer_id_table_1 := customer_id_table_1 MULTISET UNION customer_id_table_2;