Oracle insert all语句介绍

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发布于 2022-09-15 09:26:16

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发布于 2022-09-15 09:26:16

文章被收录于专栏：全栈程序员必看

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Oracle 中insert语句的高级用法，INSERT ALL 语句介绍：

1、无条件insert all 全部插入

CREATE TABLE t1(product_id NUMBER, product_name VARCHAR2(80),MONTH NUMBER);

INSERT INTO t1 VALUES(111, '苹果',1);
INSERT INTO t1 VALUES(222, '橘子',1);
INSERT INTO t1 VALUES(333, '香蕉',1);

COMMIT;

CREATE TABLE t2 AS SELECT * FROM t1 WHERE 1=2;

INSERT ALL
    INTO t2 
    VALUES (product_id, product_name,MONTH)
    INTO t2 
    VALUES (product_id, product_name,MONTH+1)
    INTO t2 
    VALUES (product_id, product_name,MONTH+2)
    INTO t2 
    VALUES (product_id, product_name,MONTH+3) 
SELECT product_id, product_name, MONTH
FROM t1;

COMMIT;

SELECT * FROM t2 ORDER BY product_id, product_name, MONTH;

———- ———- ———- 111 苹果 1 111 苹果 2 111 苹果 3 111 苹果 4 222 橘子 1 222 橘子 2 222 橘子 3 222 橘子 4 333 香蕉 1 333 香蕉 2 333 香蕉 3 333 香蕉 4

已选择12行。

2、有条件insert all

CREATE TABLE small_orders
(order_id   NUMBER(12) NOT NULL,
 customer_id    NUMBER(6) NOT NULL,
 order_total    NUMBER(8,2),
 sale_rep_id    NUMBER(6)
    
);

CREATE TABLE medium_orders AS SELECT * FROM small_orders;

CREATE TABLE large_orders AS SELECT * FROM small_orders;

CREATE TABLE special_orders
(order_id   NUMBER(12)  NOT NULL,
 customer_id    NUMBER(6)   NOT NULL,
 order_total    NUMBER(8,2),
 sale_rep_id    NUMBER(6),
 credit_limit   NUMBER(9,2),
 cust_email     VARCHAR2(30)

);

INSERT ALL
    WHEN order_total < 100000 THEN
        INTO small_orders
    WHEN order_total > 100000 AND order_total < 200000 THEN
        INTO medium_orders
    ELSE
        INTO large_orders
    SELECT order_id, customer_id, order_total, sales_rep_id 
      FROM orders;

3、有条件insert first

如果第一个 WHEN 子句的值为 true，Oracle 服务器对于给定的行执行相应的 INTO 子句，并且跳过后面的 WHEN 子句(后面的when语句都不再考虑满足第一个When子句的记录，即使该记录满足when语句中的条件)。

INSERT FIRST
   WHEN ottl < 100000 THEN
      INTO small_orders
         VALUES(oid, ottl, sid, cid)
   WHEN ottl > 100000 and ottl < 200000 THEN
      INTO medium_orders
         VALUES(oid, ottl, sid, cid)
   WHEN ottl > 290000 THEN
      INTO special_orders
   WHEN ottl > 200000 THEN
      INTO large_orders
         VALUES(oid, ottl, sid, cid)
   SELECT o.order_id oid, o.customer_id cid, o.order_total ottl,
      o.sales_rep_id sid, c.credit_limit cl, c.cust_email cem
      FROM orders o, customers c
      WHERE o.customer_id = c.customer_id;
      
SELECT * FROM small_orders;
SELECT * FROM medium_orders;
SELECT * FROM large_orders;
SELECT * FROM special_orders;

———————————

By Dylan.

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