-- Start

方法1

我估計有點 SQL 基礎的人都會寫 INSERT 語句。下面是 SQL 標準寫法。

INSERT INTO employees (employee_id, name) VALUES (1, 'Zhangsan');
INSERT INTO employees VALUES (1, 'Shangbo');

方法2

其實， Oracle 還支援下面的寫法，作用和上面的語句完全相同。

INSERT INTO (SELECT employee_id, name FROM employees) VALUES (2, 'Lisi');

方法3

此外，同其他資料庫一樣，Oracle 也支援下面這種寫法。

INSERT INTO employees
SELECT 3, 'Wangwu' FROM DUAL;

方法4

下面這種寫法可以實現列轉行，如我們有下面的表儲存原始資料，原始資料可能從檔案中來。

create table sales_input_table (
prod_id        number(9,0),
amt_mon        number(9,6),
amt_tue        number(9,6),
amt_wed        number(9,6),
amt_thu        number(9,6),
amt_fri        number(9,6)
);
insert into sales_input_table values (1, 100.0, 200.0, 300.0, 400.0, 500.0);
 

CREATE TABLE sales (
prod_id        number(9,0),
time_id        date,
amount         number(9,0)
);

INSERT ALL
INTO sales (prod_id, time_id, amount) VALUES (prod_id, CURRENT_DATE, amt_mon)
INTO sales (prod_id, time_id, amount) VALUES (prod_id, CURRENT_DATE + 1, amt_tue)
INTO sales (prod_id, time_id, amount) VALUES (prod_id, CURRENT_DATE + 2, amt_wed)
INTO sales (prod_id, time_id, amount) VALUES (prod_id, CURRENT_DATE + 3, amt_thu)
INTO sales (prod_id, time_id, amount) VALUES (prod_id, CURRENT_DATE + 4, amt_fri)
SELECT prod_id, amt_mon, amt_tue, amt_wed, amt_thu, amt_fri FROM sales_input_table;
 

方法5

下面這種寫法可以幫我們一次性把一個表中的資料倒入到多個表中，否則我們必須寫多條 SQL 實現同樣的功能。

INSERT ALL
WHEN order_total <= 100000 THEN
INTO small_orders
WHEN order_total > 100000 AND order_total <= 200000 THEN
INTO medium_orders
WHEN order_total = 500000 THEN
INTO special_orders
WHEN order_total > 200000 THEN
INTO large_orders
ELSE
INTO large_orders
SELECT order_id, order_total, sales_rep_id, customer_id FROM orders;

INSERT FIRST
WHEN order_total <= 100000 THEN
INTO small_orders
WHEN order_total > 100000 AND order_total <= 200000 THEN
INTO medium_orders
WHEN order_total = 500000 THEN
INTO special_orders
WHEN order_total > 200000 THEN
INTO large_orders
ELSE
INTO large_orders
SELECT order_id, order_total, sales_rep_id, customer_id FROM orders;

-- 宣告：轉載請註明出處

-- Last edited on 2015-06-18

-- Created by ShangBo on 2015-06-17

-- End