在 where 子句中使用 Select left

Question

我有 2 张桌子：今天的订单和记录

Table Name : Orders from today
+-----------+-----------+
|Order ID   |   Online  |
+-----------+-----------+
|   550     |      Yes  | 
|   551     |       No  |
|   552     |      Yes  | 
|   553     |      Yes  |
+-----------+-----------+

Table Name : Records
+----------------+
|       A        |
+----------------+
|   548xxxxx     |
|   549xxxxx     |
|   550xxxxx     |
|   551xxxxx     | 
|   552xxxxx     |
|   553xxxxx     |
|   554xxxxx     |
+----------------+
XXXXX represents random number

我正在尝试根据 Orders from today 表中的 ORDER ID 的前 3 位从 Records 表中获取完整记录。 我想要的结果是：

Table Name : Records
+----------------+
|       A        |
+----------------+
|   550xxxxx     |
|   551xxxxx     | 
|   552xxxxx     |
|   553xxxxx     |
+----------------+

我尝试过使用： SELECT * FROM orders WHERE orderid IN ( SELECT (LEFT(orderid, 3) FROM sample)); 但我只收到语法错误。我知道我可以使用 % 但我不知道如何适应代码。

请帮忙，非常感谢！

编辑！ 假设从今天开始的 Orders 中的 Order Id 不都是 55%

谢谢！

Answer 1

可能的数据类型转换问题

试试：

select *
from orders o1
left join records r2
  on cast(o1.orderid as varchar(3)) = left(r2.orderid,3)

Answer 2

SELECT * 
FROM orders 
WHERE orderid IN ( SELECT (LEFT(orderid, 3) 
                   FROM sample 
                   WHERE orderid LIKE '55%'));

Answer 3

我想我得到了你要找的东西。如果您需要帮助，请告诉我。 SQLFiddle 链接。 代码：

CREATE TABLE IF NOT EXISTS ordersFromToday (
    order_ID INT,
    online VARCHAR(4),
    PRIMARY KEY (order_ID)
);
INSERT INTO ordersFromToday (order_ID,online) VALUES(550,'yes'),(551,'no'),(552,'yes'),(553,'yes');

CREATE TABLE IF NOT EXISTS records (
    record_ID INT,
    PRIMARY KEY (record_ID)
);
INSERT INTO records (record_ID) VALUES (5481213),(5494833),(5505983),(5519080),(5524984),(5531315),(5549858);

     CREATE PROCEDURE GetAllProducts()
       BEGIN
        # Declare needed variables
        DECLARE finished BOOLEAN DEFAULT FALSE;
        DECLARE orderIDHold INT;

        # cursor for each order_ID
        DECLARE orderNumber CURSOR FOR
        ( SELECT order_ID FROM ordersFromToday);

        # our continue handler for quitting the loop
        DECLARE CONTINUE HANDLER 
        FOR NOT FOUND SET finished = TRUE;

        # create a table to store these values
        DROP TABLE IF EXISTS tempReportTbl;
        CREATE TABLE IF NOT EXISTS tempReportTbl ( 
            order_ID INT,
            PRIMARY KEY (order_ID)
            ); 

         # open cursors
         OPEN orderNumber;

         # start loop
         mainFunc: loop

           FETCH orderNumber INTO orderIDHold;

           IF finished = TRUE THEN
             LEAVE MAINFUNC;
           END IF;

           SET @searchOrderID :=orderIDHold;

           INSERT INTO tempReportTbl (order_ID)
           SELECT * FROM records r1 where r1.record_ID LIKE concat(@searchOrderID,'%');

        # end loop
        END LOOP mainFunc;

        # close cursors
        CLOSE orderNumber;

       END //

输出：

order_ID

• 5505983
• 5519080
• 5524984
• 5531315